Merge remote-tracking branch 'origin/master' into aniso-diffusion-dev

# Conflicts: # fem/bilininteg.hpp # fem/coefficient.cpp # fem/coefficient.hpp # linalg/hypre.cpp # linalg/hypre.hpp # linalg/solvers.cpp # makefile # miniapps/common/pfem_extras.hpp # miniapps/electromagnetics/tesla_solver.hpp
Merge pull request #4726 from mfem/blf-print
2025-03-13 17:43:24 -07:00 · 2025-03-13 07:50:55 -07:00 · 2025-03-13 07:50:02 -07:00 · 2025-03-12 13:12:56 -07:00 · 2025-03-11 16:19:43 -07:00 · 2025-03-11 15:25:54 -07:00
1016 changed files with 26430 additions and 3352 deletions
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -29,6 +29,10 @@ on:
  pull_request:
  workflow_dispatch:

+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 env:
  HYPRE_ARCHIVE: v2.19.0.tar.gz
  HYPRE_TOP_DIR: hypre-2.19.0
@@ -92,6 +96,7 @@ jobs:
            build-system: cmake
            hypre-target: int32
            precision: fp64
+            config-opts: '-DCMAKE_INSTALL_PREFIX=../cmake-install'
            # This option can be set to pass additional configuration options to
            # the MFEM configuration command.
            # config-opts: '-DCMAKE_VERBOSE_MAKEFILE=ON'
@@ -114,13 +119,6 @@ jobs:
    runs-on: ${{ matrix.os }}

    steps:
-      # This external action allows to interrupt a workflow already running on
-      # the same branch to save resources.
-      - name: Cancel Previous Runs
-        uses: styfle/cancel-workflow-action@0.12.1
-        with:
-          access_token: ${{ github.token }}
-
      # Fix 'No space left on device' errors for Ubuntu builds.
      - name: Run Actions Cleaner
        if: matrix.os == 'ubuntu-latest'
@@ -306,6 +304,22 @@ jobs:
          ctest --rerun-failed --output-on-failure -C ${CTEST_CONFIG}
        shell: bash

+      - name: make install
+        if: matrix.build-system == 'make'
+        run: |
+          cd ${{ env.MFEM_TOP_DIR }} && make install
+
+      - name: cmake install
+        if: matrix.build-system == 'cmake'
+        run: |
+          CONFIG="Release"
+          [[ ${{ matrix.target }} == 'dbg' ]] && CONFIG="Debug"
+          TARGET="install"
+          [[ ${{ matrix.os }} == 'windows-latest' ]] && TARGET="INSTALL"
+          cd ${{ env.MFEM_TOP_DIR }} && \
+          cmake --build build --target ${TARGET} --config ${CONFIG}
+        shell: bash
+
      # Code coverage (process and upload reports)
      - name: codecov
        if: matrix.codecov == 'YES'
@@ -18,6 +18,10 @@ on:
    # The branches below must be a subset of the branches above
    branches: ["master"]

+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
  analyze:
    name: Analyze
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -22,6 +22,10 @@ on:
  pull_request:
  workflow_dispatch:

+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 env:
  HYPRE_ARCHIVE: v2.19.0.tar.gz
  HYPRE_TOP_DIR: hypre-2.19.0
@@ -34,11 +38,6 @@ jobs:
    runs-on: ubuntu-latest

    steps:
-      - name: Cancel Previous Runs
-        uses: styfle/cancel-workflow-action@0.12.1
-        with:
-          access_token: ${{ github.token }}
-
      - name: checkout MFEM
        uses: actions/checkout@v4
        with:
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -22,22 +22,15 @@ on:
  pull_request:
  workflow_dispatch:

+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
  Serial:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04

    steps:
-      - name: Temporary workaround for sanitizer crashes
-        # See https://github.com/actions/runner-images/issues/9491
-        # The issue should be fixed in the next runner image for Ubuntu 22.04,
-        # see https://github.com/actions/runner-images/pull/9513
-        run: sudo sysctl vm.mmap_rnd_bits=28
-
-      - name: Cancel Previous Runs
-        uses: styfle/cancel-workflow-action@0.12.1
-        with:
-          access_token: ${{ github.token }}
-
      - name: MFEM Checkout
        uses: actions/checkout@v4
        with:
@@ -55,7 +48,7 @@ jobs:
          build-system: make
          library-only: false
          config-options:
-            CXX="clang++-14"
+            CXX="clang++-18"
            CXXFLAGS="-g -O1 -std=c++11
                      -fsanitize=address
                      -fno-omit-frame-pointer
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -19,6 +19,10 @@ on:
  pull_request:
  workflow_dispatch:

+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 # This workflow is run on pushes to any branch in the MFEM repo (with or without
 # PRs), as well as on updates to PRs from forks. In particular, we do not
 # duplicate work by running on both pushes and updates to local PRs. We do that
@@ -33,11 +37,6 @@ jobs:
      (github.event_name == 'push' ||
       github.event.pull_request.head.repo.full_name != github.repository)
    steps:
-      - name: Cancel Previous Runs
-        uses: styfle/cancel-workflow-action@0.12.1
-        with:
-          access_token: ${{ github.token }}
-
      - name: checkout mfem
        uses: actions/checkout@v4

@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -8,6 +8,7 @@

 # Object and library files
 *.o
+*.o.tmp
 /libmfem.*
 /miniapps/common/libmfem-common.*

@@ -226,6 +227,7 @@ miniapps/meshing/extruder
 miniapps/meshing/fit-node-position
 miniapps/meshing/trimmer
 miniapps/meshing/reflector
+miniapps/meshing/ref321
 miniapps/meshing/mesh-optimizer
 miniapps/meshing/pmesh-optimizer
 miniapps/meshing/pmesh-fitting
@@ -245,6 +247,8 @@ miniapps/meshing/shaper.mesh
 miniapps/meshing/extruder.mesh
 miniapps/meshing/trimmer.mesh
 miniapps/meshing/reflected.mesh
+miniapps/meshing/ref321.mesh
+miniapps/meshing/sol.gf
 miniapps/meshing/optimized*
 miniapps/meshing/perturbed*
 miniapps/meshing/polar-nc.mesh
@@ -339,6 +343,7 @@ miniapps/toys/rubik
 miniapps/toys/snake
 miniapps/toys/lissajous
 miniapps/toys/mondrian
+miniapps/toys/spiral
 miniapps/toys/snake-init.mesh
 miniapps/toys/snake-user.mesh
 miniapps/toys/snake-joined.mesh
@@ -427,3 +432,9 @@ pkg.gitcommit

 # Jupyter Notebook Checkpoints
 .ipynb_checkpoints
+
+# emacs tag file
+TAGS
+
+# vs code
+.vscode
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,6 +1,6 @@
 #!/bin/bash

-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,6 +1,6 @@
 #!/bin/bash

-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,6 +1,6 @@
 #!/bin/bash

-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,6 +1,6 @@
 #!/bin/bash

-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,6 +1,6 @@
 #!/bin/bash

-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,6 +1,6 @@
 #!/bin/bash

-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -12,6 +12,8 @@ Version 4.7.1 (development)
 ===========================
 - Refactored ALGOIM cut integration rules. The interface is unified with
  the interface for moment based cut integration rules.
+- Altered (Par)GridFunction::Compute*Error functions to ensure they return
+  non-negative values and therefore behave as "norms".

 Discretization improvements
 ---------------------------
@@ -22,11 +24,30 @@ Discretization improvements

 - Added support for external boundary submeshes with nonconformal mesh adaptation.

+- Added assembly of Jacobians to `HyperbolicFormIntegrator`.
+
+- Added average fluxes to `NumericalFlux` (formerly `RiemannSolver`)
+  and `FluxFunction`.
+
+- Added component-wise upwinded flux (`ComponentwiseUpwindFlux`).
+
+- Added support for H(div) spaces in class QuadratureInterpolator. For now, only
+  (vector) VALUES, (vector) PHYSICAL_VALUES, and PHYSICAL_MAGNITUDES evaluations
+  are implemented. [PR #4669]
+
 Meshing improvements
 --------------------
+- Added native AD support for numerous TMOP metrics that didn't have first or
+  second derivative implementations.
+
 - The ExodusII reader now handles pyramid and wedge element types. Mixed meshes
  are also supported.

+- Added support for nonuniform anisotropic (nonconforming) mesh refinement with
+  arbitrary spacing in each direction, for quadrilateral (2D) and hexahedral
+  (3D) meshes. This enables in particular 3:1 refinement, as demonstrated in the
+  new meshing miniapp ref321.
+
 New and updated examples and miniapps
 -------------------------------------
 - Added miniapps to demonstrate the H(div) and H(curl) NURBS elements.
@@ -34,6 +55,9 @@ New and updated examples and miniapps
 - Added an MFEM example for the eikonal equation. This new solver is based on
  the proximal Galerkin method introduced by Keith and Surowiec.

+- Added a new toy miniapp that animates an interesting fidget spiral cone toy.
+  See miniapps/toys/spiral.cpp.
+
 - Added a command line option to all miniapps (`-p` or `--send-port`) for
  specifying the GLVis server socket port (19916 by default).

@@ -58,6 +82,13 @@ GPU computing
  high-order transfer operators. New kernels can be offloaded as device
  kernels. Example usage may be found in lor-transfer.cpp under miniapps/tools.

+- Added support for GPU accelerated FindPointsGSLIB. Note that this will require
+  the users to switch from gslib v1.0.7 to v1.0.9.
+
+- Allow BlockLowerTriangularPreconditioner to run on GPU.
+
+- Use device vectors in GMRES, FGMRES and other iterative methods.
+
 Miscellaneous
 -------------
 - Added support for SUNDIALS v7. See the section "API changes" for some small
@@ -75,10 +106,49 @@ Miscellaneous

 - Added support for custom interpolation procedure in FindPointsGSLIB.

+- `FiniteElementSpace` has new methods to directly set prolongation and
+  restriction operators to arbitrary sparse matrices.
+
+- There are new convenience constructors for NURBS patches and knot vectors.
+
+- Added convenience methods for manipulating boundary attribute marker arrays;
+  `(Par)Mesh::MarkExternalBoundaries`, `(Par)Mesh::UnmarkInternalBoundaries`,
+  `(Par)Mesh::MarkNamedBoundaries`, and `(Par)Mesh::UnmarkNamedBoundaries`.
+  See examples `ex1.cpp`, `ex1p.cpp`, and `ex11p.cpp` for basic usage.
+
+- Added `(Par)Mesh::GetExteriorFaceMarker` for identifying faces on the
+  exterior of the mesh irrespective of their presence in the list of "boundary
+  elements".
+
+- Added methods to `(Par)FiniteElementSpace` to identify all degrees of freedom
+  located on the exterior of the domain without reference to the list of
+  "boundary elements"; `GetExteriorVDofs` and `GetExteriorTrueDofs`.
+
+- `LinearFormIntegrator` and `NonlinearFormIntegrator` (including
+  `BilinearFormIntegrator`) now all inherit from a base class `Integrator`
+  that combines some logic related to selecting quadrature rules. This includes
+  a virtual method `Integrator::GetDefaultIntegrationRule`, which should be
+  favored over directly defining a default integration rule in the element-level
+  assembly routines (although the latter is still possible, by leaving the new
+  virtual method as its default base implementation of returning `NULL`).
+
+- Updated the benchmarks (in tests/benchmarks) to work with the latest Google
+  Benchmarks classes (version 1.9.1). Renamed the MFEM_ENABLE_GOOGLE_BENCHMARKS
+  CMake option to just MFEM_ENABLE_BENCHMARKS.
+
+- Changed the name of `IterativeSolverMonitor` to `IterativeSolverController`
+  which now allows for declaring convergence by a user defined criterion. For
+  backward compatibility, the old name is still available.
+
 API changes
 -----------
+- API change: 'TMOP_Metric_skew2D' has been marked as deprecated.
+
 - API change: in class GridFunction, 'fec' was renamed to 'fec_owned'.

+- API change: `RiemannSolver` was renamed to `NumericalFlux` (the old name has
+  been been deprecated through typedef)
+
 - API change: support for SUNDIALS v7:
  * the SUNDIALS types `realtype` and `booleantype` are no longer defined by v7
    and therefore MFEM now uses the new type names `sunrealtype` and
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -87,13 +87,16 @@ if (MFEM_USE_STRUMPACK OR MFEM_USE_MUMPS)
  # Just needed to find the MPI_Fortran libraries to link with
  set(XSDK_ENABLE_Fortran ON)
 endif()
-# SUNDIALS, STRUMPACK, Ginkgo, Tribol, RAJA and Umpire require C++14:
-if ((MFEM_USE_SUNDIALS OR
-     MFEM_USE_STRUMPACK OR
-     MFEM_USE_GINKGO OR
-     MFEM_USE_TRIBOL OR
-     MFEM_USE_RAJA OR
-     MFEM_USE_UMPIRE) AND
+# Ginkgo requires C++17:
+if ((MFEM_USE_GINKGO) AND ("${CMAKE_CXX_STANDARD}" LESS "17"))
+  set(CMAKE_CXX_STANDARD 17 CACHE STRING "C++ standard to use." FORCE)
+# Google Benchmark, SUNDIALS, STRUMPACK, Tribol, RAJA and Umpire require C++14:
+elseif ((MFEM_USE_BENCHMARK OR
+         MFEM_USE_SUNDIALS OR
+         MFEM_USE_STRUMPACK OR
+         MFEM_USE_TRIBOL OR
+         MFEM_USE_RAJA OR
+         MFEM_USE_UMPIRE) AND
    ("${CMAKE_CXX_STANDARD}" LESS "14"))
  set(CMAKE_CXX_STANDARD 14 CACHE STRING "C++ standard to use." FORCE)
 endif()
@@ -618,15 +621,37 @@ set(MASTER_HEADERS
  ${PROJECT_SOURCE_DIR}/mfem.hpp
  ${PROJECT_SOURCE_DIR}/mfem-performance.hpp)

-set(_lib_path "${CMAKE_INSTALL_PREFIX}/lib")
-set(CMAKE_INSTALL_RPATH_USE_LINK_PATH ON CACHE BOOL "")
-set(CMAKE_INSTALL_RPATH "${_lib_path}" CACHE PATH "")
-set(CMAKE_INSTALL_NAME_DIR "${_lib_path}" CACHE PATH "")
+# Installation options (we use GNUInstallDirs but prefer lib by default)
+set(MFEM_USE_GNUINSTALLDIRS OFF CACHE BOOL
+  "Use CMAKE_INSTALL_LIBDIR as defined by the GNUInstallDirs CMake module.")
+if (NOT MFEM_USE_GNUINSTALLDIRS)
+  mfem_cache_path(CMAKE_INSTALL_LIBDIR "lib" "Object code libraries (lib)")
+endif()
+include(GNUInstallDirs)
+mfem_cache_path(INSTALL_INCLUDE_DIR "${CMAKE_INSTALL_INCLUDEDIR}"
+  "Relative or absolute path for installing header files.")
+mfem_cache_path(INSTALL_BIN_DIR "${CMAKE_INSTALL_BINDIR}"
+  "Relative or absolute path for installing the binaries.")
+mfem_cache_path(INSTALL_LIB_DIR "${CMAKE_INSTALL_LIBDIR}"
+  "Relative or absolute path for installing the library.")
+mfem_cache_path(INSTALL_SHARE_DIR "${CMAKE_INSTALL_DATAROOTDIR}"
+  "Relative or absolute path for installing shared data.")
+# other options: "share/mfem/cmake", "lib/mfem/cmake"
+mfem_cache_path(INSTALL_CMAKE_DIR "${INSTALL_LIB_DIR}/cmake/mfem"
+  "Relative or absolute path for installing cmake config files.")

-set(MFEM_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR} CACHE PATH
-    "The MFEM source directory" FORCE)
-set(MFEM_INSTALL_DIR ${CMAKE_INSTALL_PREFIX} CACHE PATH
-    "The MFEM install directory" FORCE)
+mfem_path_to_fullpath("${INSTALL_LIB_DIR}" "${CMAKE_INSTALL_PREFIX}" _lib_path)
+set(CMAKE_INSTALL_RPATH_USE_LINK_PATH ON CACHE BOOL "")
+if(NOT DEFINED CMAKE_INSTALL_RPATH)
+  set(CMAKE_INSTALL_RPATH "${_lib_path}")
+endif()
+if(NOT DEFINED CMAKE_INSTALL_NAME_DIR)
+  set(CMAKE_INSTALL_NAME_DIR "${_lib_path}")
+endif()
+
+# Variables used when generating _config.hpp, and config.mk
+set(MFEM_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
+set(MFEM_INSTALL_DIR ${CMAKE_INSTALL_PREFIX})

 # Declaring the library
 mfem_add_library(mfem ${SOURCES} ${HEADERS} ${MASTER_HEADERS})
@@ -722,11 +747,17 @@ if (MFEM_ENABLE_TESTING)
  add_mfem_target(${MFEM_ALL_TESTS_TARGET_NAME} OFF)
  add_subdirectory(tests EXCLUDE_FROM_ALL)

-  # Create a target for all benchmarks and, optionally, enable it.
-  set(MFEM_ALL_BENCHMARKS_TARGET_NAME benchmarks)
-  add_mfem_target(${MFEM_ALL_BENCHMARKS_TARGET_NAME}
-                  ${MFEM_ENABLE_GOOGLE_BENCHMARKS})
-  add_subdirectory(tests/benchmarks EXCLUDE_FROM_ALL)
+  if (MFEM_USE_BENCHMARK)
+    # Create a target for all benchmarks and, optionally, enable it.
+    set(MFEM_ALL_BENCHMARKS_TARGET_NAME benchmarks)
+    add_mfem_target(${MFEM_ALL_BENCHMARKS_TARGET_NAME}
+                    ${MFEM_ENABLE_BENCHMARKS})
+    if (MFEM_ENABLE_BENCHMARKS)
+      add_subdirectory(tests/benchmarks) #install benchmarks if enabled
+    else()
+      add_subdirectory(tests/benchmarks EXCLUDE_FROM_ALL)
+    endif()
+  endif()
 endif()

 # Define a target that all examples and miniapps will depend on.
@@ -745,7 +776,11 @@ endif()
 # Create a target for all miniapps and, optionally, enable it.
 set(MFEM_ALL_MINIAPPS_TARGET_NAME miniapps)
 add_mfem_target(${MFEM_ALL_MINIAPPS_TARGET_NAME} ${MFEM_ENABLE_MINIAPPS})
-add_subdirectory(miniapps EXCLUDE_FROM_ALL)
+if (MFEM_ENABLE_MINIAPPS)
+  add_subdirectory(miniapps) #install miniapps if enabled
+else()
+  add_subdirectory(miniapps EXCLUDE_FROM_ALL)
+endif()

 # Target to build all executables, i.e. everything.
 add_custom_target(exec)
@@ -795,15 +830,6 @@ add_subdirectory(doc)
 #-------------------------------------------------------------------------------

 message(STATUS "CMAKE_INSTALL_PREFIX = ${CMAKE_INSTALL_PREFIX}")
-set(INSTALL_INCLUDE_DIR include
-  CACHE PATH "Relative path for installing header files.")
-set(INSTALL_BIN_DIR bin
-  CACHE PATH "Relative path for installing the binaries.")
-set(INSTALL_LIB_DIR lib
-  CACHE PATH "Relative path for installing the library.")
-# other options: "share/mfem/cmake", "lib/mfem/cmake"
-set(INSTALL_CMAKE_DIR lib/cmake/mfem
-  CACHE PATH "Relative path for installing cmake config files.")

 target_include_directories(mfem BEFORE
  PUBLIC
@@ -828,7 +854,7 @@ foreach(Header mfem.hpp mfem-performance.hpp)
 endforeach()
 install(FILES ${MASTER_HEADERS} DESTINATION ${INSTALL_INCLUDE_DIR}/mfem)

-# Install the headers; currently, the miniapps headers are excluded
+# Install the headers (except common miniapp which is installed from its subdir)
 install(DIRECTORY ${MFEM_SOURCE_DIRS}
  DESTINATION ${INSTALL_INCLUDE_DIR}/mfem
  FILES_MATCHING PATTERN "*.hpp")
@@ -220,9 +220,10 @@ An optional installation of the library and the headers can be performed with

   make install [PREFIX=<dir>]

-The library will be installed in $(PREFIX)/lib, the headers in
-$(PREFIX)/include, and the configuration makefile (config.mk) in
-$(PREFIX)/share/mfem. The PREFIX option can also be set during configuration.
+The library will be installed in ${PREFIX}/lib, the headers in
+${PREFIX}/include, and the configuration and testing makefiles (config.mk and
+test.mk) in ${PREFIX}/share/mfem. The PREFIX option can also be set during
+configuration.

 Information about the current build configuration can be viewed using

@@ -271,8 +272,9 @@ Build options:

 Installation options:
   PREFIX  - Specify the installation directory. The library (libmfem.a) will be
-             installed in $(PREFIX)/lib, the headers in $(PREFIX)/include, and
-             the configuration makefile (config.mk) in $(PREFIX)/share/mfem.
+             installed in ${PREFIX}/lib, the headers in ${PREFIX}/include, and
+             the configuration and testing makefiles (config.mk and test.mk) in
+             ${PREFIX}/share/mfem.
   INSTALL - Specify the install program, default = /usr/bin/install
   INSTALL_DEF_PERM - Specify the default install permissions. This affects
                      headers and configuration makefiles, default = 644
@@ -702,12 +704,12 @@ The specific libraries and their options are:
  Versions: STRUMPACK >= 3.0.0.

 - Ginkgo (optional), used when MFEM_USE_GINKGO = YES. Note that Ginkgo needs a
-  C++ compiler that supports the C++-14 standard. For additional requirements
+  C++ compiler that supports the C++-17 standard. For additional requirements
  and dependencies of specific modules, see the Ginkgo webpage below.
  URL: https://ginkgo-project.github.io
  Options: GINKGO_OPT, GINKGO_LIB, GINKGO_DIR, GINKGO_BUILD_TYPE (Release or
           Debug).
-  Versions: Ginkgo >= 1.4.0.
+  Versions: Ginkgo >= 1.9.0.

 - AmgX (optional), used when MFEM_USE_AMGX = YES.
  URL: https://github.com/NVIDIA/AMGX
@@ -791,14 +793,14 @@ The specific libraries and their options are:
  Versions: 1.9.3

 - GSLIB (optional), used when MFEM_USE_GSLIB = YES. The gslib library must be
-  built prior to the MFEM build, as follows: download gslib-1.0.7, untar it at
-  the same level as MFEM and create a symbolic link: "ln -s gslib-1.0.7 gslib".
+  built prior to the MFEM build, as follows: download gslib-1.0.9, untar it at
+  the same level as MFEM and create a symbolic link: "ln -s gslib-1.0.9 gslib".
  Build gslib in parallel or in serial based on the desired MFEM build: "make
  clean; make CC=mpicc" or "make clean; make CC=gcc MPI=0". Build MFEM with
  MFEM_USE_GSLIB=YES.
-  URL: https://github.com/gslib/gslib/archive/v1.0.7.tar.gz
+  URL: https://github.com/gslib/gslib/archive/v1.0.9.tar.gz
  Options: GSLIB_OPT, GSLIB_LIB.
-  Versions: GSLIB >= 1.0.7.
+  Versions: GSLIB >= 1.0.9.

 - ALGOIM (optional), used when MFEM_USE_ALGOIM=YES. The library provides only
  headers so it just needs to be downloaded at the same level as MFEM. Download
@@ -980,8 +982,20 @@ or
   cmake --build . --config Release --target install  [Xcode]
   cmake --build . --config Release --target INSTALL  [Visual Studio]

-The library will be installed in <PREFIX>/lib, the headers in <PREFIX>/include,
-and the configuration CMake files in <PREFIX>/lib/cmake/mfem.
+By default, the library will be installed in ${CMAKE_INSTALL_PREFIX}/lib, the
+headers in ${CMAKE_INSTALL_PREFIX}/include, the configuration CMake files in
+${CMAKE_INSTALL_PREFIX}/lib/cmake/mfem, and the configuration and testing GNU
+make files in ${CMAKE_INSTALL_PREFIX}/share/mfem. For fine-tuning the
+installation directories the following variables can be used:
+INSTALL_INCLUDE_DIR, INSTALL_LIB_DIR, INSTALL_BIN_DIR (e.g. for dll files on
+Windows), INSTALL_SHARE_DIR, and INSTALL_CMAKE_DIR; alternatively, with lower
+precedence, the CMake GNUInstallDirs variables can also be used:
+CMAKE_INSTALL_INCLUDEDIR, CMAKE_INSTALL_LIBDIR, CMAKE_INSTALL_BINDIR and
+CMAKE_INSTALL_DATAROOTDIR. Note that the default for INSTALL_LIB_DIR and
+CMAKE_INSTALL_LIBDIR is lib. This is in contrast to the default behavior for
+GNUInstallDirs, which defines a platform-dependent default value for
+CMAKE_INSTALL_LIBDIR (lib or lib64 or lib/<multiarch-tuple> on Debian). To
+restore this behavior, the user can set MFEM_USE_GNUINSTALLDIRS=YES.


 Configuration variables (CMake)
@@ -1,6 +1,6 @@
 BSD 3-Clause License

-Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC
+Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC
 All rights reserved.

 Redistribution and use in source and binary forms, with or without
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -50,6 +50,7 @@ set(MFEM_USE_FMS @MFEM_USE_FMS@)
 set(MFEM_USE_CONDUIT @MFEM_USE_CONDUIT@)
 set(MFEM_USE_PUMI @MFEM_USE_PUMI@)
 set(MFEM_USE_CUDA @MFEM_USE_CUDA@)
+set(MFEM_USE_HIP @MFEM_USE_HIP@)
 set(MFEM_USE_OCCA @MFEM_USE_OCCA@)
 set(MFEM_USE_RAJA @MFEM_USE_RAJA@)
 set(MFEM_USE_CEED @MFEM_USE_CEED@)
@@ -1,4 +1,4 @@
-// Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+// Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 // at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 // LICENSE and NOTICE for details. LLNL-CODE-806117.
 //
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -117,8 +117,8 @@ macro (MULTIPASS_SOURCE_RUNS includes libraries source runs language)
  math (EXPR _tmp "${MULTIPASS_TEST_COUNT} + 1") # Why can't I add to a cache variable?
  set (MULTIPASS_TEST_COUNT ${_tmp} CACHE INTERNAL "Unique test ID")
  set (testname MULTIPASS_TEST_${MULTIPASS_TEST_COUNT}_${runs})
-  set (CMAKE_REQUIRED_INCLUDES ${includes})
-  set (CMAKE_REQUIRED_LIBRARIES ${libraries})
+  set (CMAKE_REQUIRED_INCLUDES ${includes} ${MPI_${language}_INCLUDE_PATH})
+  set (CMAKE_REQUIRED_LIBRARIES ${libraries} ${MPI_${language}_LIBRARIES})
  if(${language} STREQUAL "C")
    check_c_source_runs ("${source}" ${testname})
  elseif(${language} STREQUAL "CXX")
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -14,7 +14,7 @@
 #   - SLEPC_INCLUDE_DIRS
 #   - SLEPC_LIBRARIES

-set(SLEPc_REQUIRED_PACKAGES "PETSC" CACHE STRING
+set(SLEPc_REQUIRED_PACKAGES "PETSC" "MPI" CACHE STRING
  "Additional packages required by SLEPc")

 include(MfemCmakeUtilities)
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -138,6 +138,8 @@ macro(add_mfem_miniapp MFEM_EXE_NAME)
  # Actually add the executable
  mfem_add_executable(${MFEM_EXE_NAME} ${MAIN_LIST}
      ${EXTRA_SOURCES_LIST} ${EXTRA_HEADERS_LIST})
+  install(TARGETS ${MFEM_EXE_NAME}
+          RUNTIME DESTINATION miniapps)
  add_dependencies(${MFEM_ALL_MINIAPPS_TARGET_NAME} ${MFEM_EXE_NAME})
  add_dependencies(${MFEM_EXE_NAME} ${MFEM_EXEC_PREREQUISITES_TARGET_NAME})

@@ -825,6 +827,20 @@ function(mfem_get_target_options Target CompileOptsVar LinkOptsVar)
 endfunction(mfem_get_target_options)


+#
+# If ${Path} is not an absolute path, assign ${Prefix}/${Path} to the variable
+# ${OutVar}. If ${Path} is an absolute path, assign ${Path} to the variable
+# ${OutVar}.
+#
+function(mfem_path_to_fullpath Path Prefix OutVar)
+  if(IS_ABSOLUTE "${Path}")
+    set(${OutVar} "${Path}" PARENT_SCOPE)
+  else()
+    set(${OutVar} "${Prefix}/${Path}" PARENT_SCOPE)
+  endif()
+endfunction()
+
+
 #
 #   Function that creates 'config.mk' from 'config.mk.in' for the both the
 #   build- and the install-locations and define install rules for 'config.mk'
@@ -991,9 +1007,12 @@ function(mfem_export_mk_files)
    "${PROJECT_BINARY_DIR}/config/test.mk" COPYONLY)

  # Update variables for the install-tree version of 'config.mk'
-  set(MFEM_INC_DIR "${CMAKE_INSTALL_PREFIX}/include")
-  set(MFEM_LIB_DIR "${CMAKE_INSTALL_PREFIX}/lib")
-  set(MFEM_TEST_MK "${CMAKE_INSTALL_PREFIX}/share/mfem/test.mk")
+  mfem_path_to_fullpath(
+    "${INSTALL_INCLUDE_DIR}" "${CMAKE_INSTALL_PREFIX}" MFEM_INC_DIR)
+  mfem_path_to_fullpath(
+    "${INSTALL_LIB_DIR}" "${CMAKE_INSTALL_PREFIX}" MFEM_LIB_DIR)
+  mfem_path_to_fullpath(
+    "${INSTALL_SHARE_DIR}/mfem/test.mk" "${CMAKE_INSTALL_PREFIX}" MFEM_TEST_MK)
  set(MFEM_CONFIG_EXTRA "")

  # Create the install-tree version of 'config.mk'
@@ -1003,8 +1022,30 @@ function(mfem_export_mk_files)

  # Install rules for 'config.mk' and 'test.mk'
  install(FILES ${PROJECT_SOURCE_DIR}/config/test.mk
-    DESTINATION ${CMAKE_INSTALL_PREFIX}/share/mfem/)
+    DESTINATION ${INSTALL_SHARE_DIR}/mfem/)
  install(FILES ${PROJECT_BINARY_DIR}/config/config-install.mk
-    DESTINATION ${CMAKE_INSTALL_PREFIX}/share/mfem/ RENAME config.mk)
+    DESTINATION ${INSTALL_SHARE_DIR}/mfem/
+    RENAME config.mk)

 endfunction()
+
+
+#
+# Function similar to the macro _GNUInstallDirs_cache_path from the module
+# GNUInstallDirs. Used to process variables like INSTALL_LIB_DIR if they are
+# set on the cmake command line without specifying type: -DINSTALL_LIB_DIR=lib.
+# Without this special treatment, relative paths are expanded to full paths
+# and we want to avoid that.
+#
+function(mfem_cache_path PathVar DefaultPath HelpStr)
+  if(NOT DEFINED ${PathVar})
+    set(${PathVar} "${DefaultPath}" CACHE PATH "${HelpStr}")
+  endif()
+  get_property(cache_type CACHE ${PathVar} PROPERTY TYPE)
+  if(cache_type STREQUAL "UNINITIALIZED")
+    file(TO_CMAKE_PATH "${${PathVar}}" cmakepath)
+    set_property(CACHE ${PathVar} PROPERTY TYPE PATH)
+    set_property(CACHE ${PathVar} PROPERTY VALUE "${cmakepath}")
+    set_property(CACHE ${PathVar} PROPERTY HELPSTRING "${HelpStr}")
+  endif()
+endfunction()
@@ -1,4 +1,4 @@
-// Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+// Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 // at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 // LICENSE and NOTICE for details. LLNL-CODE-806117.
 //
@@ -1,4 +1,4 @@
-// Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+// Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 // at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 // LICENSE and NOTICE for details. LLNL-CODE-806117.
 //
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -86,7 +86,7 @@ set(MFEM_MPI_NP 4 CACHE STRING "Number of processes used for MPI tests")
 option(MFEM_ENABLE_TESTING "Enable the ctest framework for testing" ON)
 option(MFEM_ENABLE_EXAMPLES "Build all of the examples" OFF)
 option(MFEM_ENABLE_MINIAPPS "Build all of the miniapps" OFF)
-option(MFEM_ENABLE_GOOGLE_BENCHMARKS "Build all of the Google benchmarks" OFF)
+option(MFEM_ENABLE_BENCHMARKS "Build all of the benchmarks" OFF)

 # Setting CXX/MPICXX on the command line or in user.cmake will overwrite the
 # autodetected C++ compiler.
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -271,10 +271,6 @@ POSIX_CLOCKS_LIB = -lrt
 # For sundials_nvecmpiplusx and nvecparallel remember to build with MPI_ENABLE=ON
 # and modify cmake variables for hypre for sundials
 SUNDIALS_DIR = @MFEM_DIR@/../sundials-5.0.0/instdir
-# SUNDIALS >= 6.4.0 requires C++14:
-ifeq ($(MFEM_USE_SUNDIALS),YES)
-   BASE_FLAGS = -std=c++14
-endif
 SUNDIALS_OPT = -I$(SUNDIALS_DIR)/include
 SUNDIALS_LIB = $(XLINKER)-rpath,$(SUNDIALS_DIR)/lib64\
 $(XLINKER)-rpath,$(SUNDIALS_DIR)/lib\
@@ -353,9 +349,6 @@ MUMPS_LIB += -lmumps_common -lpord $(SCALAPACK_LIB) $(LAPACK_LIB) $(MPI_FORTRAN_

 # STRUMPACK library configuration
 STRUMPACK_DIR = @MFEM_DIR@/../STRUMPACK-build
-ifeq ($(MFEM_USE_STRUMPACK),YES)
-   BASE_FLAGS = -std=c++14
-endif
 STRUMPACK_OPT = -I$(STRUMPACK_DIR)/include $(SCOTCH_OPT)
 # If STRUMPACK was build with OpenMP support, the following may be need:
 # STRUMPACK_OPT += $(OPENMP_OPT)
@@ -366,9 +359,6 @@ STRUMPACK_LIB = -L$(STRUMPACK_DIR)/lib -lstrumpack $(MPI_FORTRAN_LIB)\
 GINKGO_DIR = @MFEM_DIR@/../ginkgo/install
 GINKGO_SEARCH_DIR = $(subst @MFEM_DIR@,$(MFEM_DIR),$(GINKGO_DIR))
 GINKGO_BUILD_TYPE=Release
-ifeq ($(MFEM_USE_GINKGO),YES)
-   BASE_FLAGS = -std=c++14
-endif
 GINKGO_OPT = -isystem $(GINKGO_DIR)/include
 GINKGO_LIB_DIR = $(sort $(dir $(wildcard\
 $(GINKGO_SEARCH_DIR)/lib*/libginkgo*.a\
@@ -562,9 +552,6 @@ CEED_OPT = -I$(CEED_DIR)/include
 CEED_LIB = $(XLINKER)-rpath,$(CEED_DIR)/lib -L$(CEED_DIR)/lib -lceed

 # RAJA library configuration
-ifeq ($(MFEM_USE_RAJA),YES)
-   BASE_FLAGS = -std=c++14
-endif
 RAJA_DIR = @MFEM_DIR@/../raja
 RAJA_OPT = -I$(RAJA_DIR)/include
 ifdef CUB_DIR
@@ -579,9 +566,6 @@ endif
 RAJA_LIB = $(XLINKER)-rpath,$(RAJA_DIR)/lib -L$(RAJA_DIR)/lib -lRAJA $(CAMP_LIB)

 # UMPIRE library configuration
-ifeq ($(MFEM_USE_UMPIRE),YES)
-   BASE_FLAGS = -std=c++14
-endif
 UMPIRE_DIR = @MFEM_DIR@/../umpire
 UMPIRE_OPT = -I$(UMPIRE_DIR)/include $(if $(CAMP_DIR), -I$(CAMP_DIR)/include)
 UMPIRE_LIB = -L$(UMPIRE_DIR)/lib -lumpire $(CAMP_LIB)
@@ -609,9 +593,6 @@ PARELAG_OPT = -I$(PARELAG_DIR)/src -I$(PARELAG_DIR)/build/src
 PARELAG_LIB = -L$(PARELAG_DIR)/build/src -lParELAG

 # Tribol library configuration
-ifeq ($(MFEM_USE_TRIBOL),YES)
-   BASE_FLAGS = -std=c++14
-endif
 AXOM_DIR = @MFEM_DIR@/../axom
 TRIBOL_DIR = @MFEM_DIR@/../tribol
 TRIBOL_OPT = -I$(TRIBOL_DIR)/include -I$(AXOM_DIR)/include
@@ -634,6 +615,15 @@ ENZYME_VERSION ?= 14
 ENZYME_OPT = -fno-experimental-new-pass-manager -Xclang -load -Xclang $(ENZYME_DIR)/ClangEnzyme-$(ENZYME_VERSION).so
 ENZYME_LIB = ""

+# Google Benchmark, SUNDIALS >= 6.4.0, STRUMPACK, RAJA, UMPIRE, and Tribol require C++14:
+ifneq ($(filter YES,$(MFEM_USE_BENCHMARK) $(MFEM_USE_SUNDIALS) $(MFEM_USE_STRUMPACK) $(MFEM_USE_RAJA) $(MFEM_USE_UMPIRE) $(MFEM_USE_TRIBOL)),)
+    BASE_FLAGS = -std=c++14
+endif
+# Ginkgo requires C++17:
+ifeq ($(MFEM_USE_GINKGO),YES)
+   BASE_FLAGS = -std=c++17
+endif
+
 # If YES, enable some informational messages
 VERBOSE = NO

@@ -1,4 +1,4 @@
-// Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+// Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 // at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 // LICENSE and NOTICE for details. LLNL-CODE-806117.
 //
@@ -1,4 +1,4 @@
-// Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+// Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 // at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 // LICENSE and NOTICE for details. LLNL-CODE-806117.
 //
@@ -1,6 +1,6 @@
 #!/bin/bash

-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -36,8 +36,8 @@ cd $(git rev-parse --show-toplevel)
 # copyright check
 copyright=true
 if [[ "${option}" == "--copyright" || "${option}" == "" ]]; then
-  if git grep -n "^\(#\|//\).*Copyright.*2010-20\(2[^4]\|[^2].\)" > matches.txt; then
-    echo "Please update the following files to Copyright (c) 2010-2024:"
+  if git grep -n "^\(#\|//\).*Copyright.*2010-20\(2[^5]\|[^2].\)" > matches.txt; then
+    echo "Please update the following files to Copyright (c) 2010-2025:"
    cat matches.txt
    copyright=false
  fi
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -110,4 +110,5 @@ config-mk:

 clean:
 	rm -f $(CONFIG_HPP) $(CONFIG_MK) sample-runs-build.log
-	rm -f $(GHV) $(GHV).out $(GMV) $(GMV).out *.dSYM
+	rm -f $(GHV) $(GHV).out $(GMV) $(GMV).out
+	rm -rf *.dSYM
@@ -1,6 +1,6 @@
 #!/bin/bash

-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-// Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+// Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 // at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 // LICENSE and NOTICE for details. LLNL-CODE-806117.
 //
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -1,4 +1,4 @@
-# Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
+# Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
 # at the Lawrence Livermore National Laboratory. All Rights reserved. See files
 # LICENSE and NOTICE for details. LLNL-CODE-806117.
 #
@@ -163,13 +163,18 @@ int main(int argc, char *argv[])

   // 6. Determine the list of true (i.e. conforming) essential boundary dofs.
   //    In this example, the boundary conditions are defined by marking all
-   //    the boundary attributes from the mesh as essential (Dirichlet) and
-   //    converting them to a list of true dofs.
+   //    the external boundary attributes from the mesh as essential (Dirichlet)
+   //    and converting them to a list of true dofs.
   Array<int> ess_tdof_list;
   if (mesh.bdr_attributes.Size())
   {
      Array<int> ess_bdr(mesh.bdr_attributes.Max());
-      ess_bdr = 1;
+      ess_bdr = 0;
+      // Apply boundary conditions on all external boundaries:
+      mesh.MarkExternalBoundaries(ess_bdr);
+      // Boundary conditions can also be applied based on named attributes:
+      // mesh.MarkNamedBoundaries(set_name, ess_bdr)
+
      fespace.GetEssentialTrueDofs(ess_bdr, ess_tdof_list);
   }

@@ -192,7 +192,11 @@ int main(int argc, char *argv[])
   if (pmesh->bdr_attributes.Size())
   {
      ess_bdr.SetSize(pmesh->bdr_attributes.Max());
-      ess_bdr = 1;
+      ess_bdr = 0;
+      // Apply boundary conditions on all external boundaries:
+      pmesh->MarkExternalBoundaries(ess_bdr);
+      // Boundary conditions can also be applied based on named attributes:
+      // pmesh->MarkNamedBoundaries(set_name, ess_bdr)
   }

   ParBilinearForm *a = new ParBilinearForm(fespace);
@@ -59,7 +59,7 @@ private:
 void GeneralResidualMonitor::MonitorResidual(int it, real_t norm,
                                             const Vector &r, bool final)
 {
-   if (print_level == 1 || (print_level == 3 && (final || it == 0)))
+   if ((print_level == 1 && !final) || (print_level == 3 && (final || it == 0)))
   {
      mfem::out << prefix << " iteration " << setw(2) << it
                << " : ||r|| = " << norm;
@@ -73,7 +73,7 @@ private:
 void GeneralResidualMonitor::MonitorResidual(int it, real_t norm,
                                             const Vector &r, bool final)
 {
-   if (print_level == 1 || (print_level == 3 && (final || it == 0)))
+   if ((print_level == 1 && !final) || (print_level == 3 && (final || it == 0)))
   {
      mfem::out << prefix << " iteration " << setw(2) << it
                << " : ||r|| = " << norm;
@@ -190,13 +190,18 @@ int main(int argc, char *argv[])

   // 8. Determine the list of true (i.e. parallel conforming) essential
   //    boundary dofs. In this example, the boundary conditions are defined
-   //    by marking all the boundary attributes from the mesh as essential
-   //    (Dirichlet) and converting them to a list of true dofs.
+   //    by marking all the external boundary attributes from the mesh as
+   //    essential (Dirichlet) and converting them to a list of true dofs.
   Array<int> ess_tdof_list;
   if (pmesh.bdr_attributes.Size())
   {
      Array<int> ess_bdr(pmesh.bdr_attributes.Max());
-      ess_bdr = 1;
+      ess_bdr = 0;
+      // Apply boundary conditions on all external boundaries:
+      pmesh.MarkExternalBoundaries(ess_bdr);
+      // Boundary conditions can also be applied based on named attributes:
+      // pmesh.MarkNamedBoundaries(set_name, ess_bdr)
+
      fespace.GetEssentialTrueDofs(ess_bdr, ess_tdof_list);
   }

@@ -206,7 +206,7 @@ int main(int argc, char *argv[])
   // 7. Set up the linear form b(.) which corresponds to the right-hand side of
   //    the FEM linear system.
   ComplexLinearForm b(fespace, conv);
-   b.Vector::operator=(0.0);
+   b = 0.0;

   // 8. Define the solution vector u as a complex finite element grid function
   //    corresponding to fespace. Initialize u with initial guess of 1+0i or
--- a/Show More
+++ b/Show More