feat(initial): added portable mfem build system

tools/validate_matrix.sh

@@ -0,0 +1,66 @@
+#!/bin/sh
+set -eu
+
+project_root=$(CDPATH= cd -- "$(dirname -- "$0")/.." && pwd)
+meson_bin=${MESON_BIN:-meson}
+meson_dir=$(CDPATH= cd -- "$(dirname -- "$meson_bin")" && pwd)
+profile=${MFEM_MATRIX_PROFILE:-portable}
+jobs=${MFEM_JOBS:-4}
+
+compiler_family() {
+    "$1" --version 2>&1 | sed -n '1p'
+}
+
+require_clang() {
+    version=$(compiler_family "$1")
+    case "$version" in
+        *clang*|*Clang*) ;;
+        *) echo "error: $1 is not a Clang compiler: $version" >&2; exit 2 ;;
+    esac
+}
+
+require_gnu() {
+    version=$(compiler_family "$1")
+    case "$version" in
+        *gcc*|*GCC*|*"Free Software Foundation"*) ;;
+        *) echo "error: $1 is not a GNU compiler: $version" >&2; exit 2 ;;
+    esac
+}
+
+run_configuration() {
+    name=$1
+    c_compiler=$2
+    cxx_compiler=$3
+    mode=$4
+    build_dir="$project_root/build-$name"
+
+    if test -f "$build_dir/meson-private/coredata.dat"; then
+        wipe_flag=--wipe
+    else
+        wipe_flag=
+    fi
+    env PATH="$meson_dir:$PATH" CC="$c_compiler" CXX="$cxx_compiler" \
+        "$meson_bin" setup $wipe_flag "$build_dir" "$project_root" \
+            --buildtype="$mode" \
+            -Dallow_preinstalled=false \
+            -Dfeature_profile="$profile" \
+            -Dbuild_examples=true \
+            -Dbuild_tests=true \
+            -Dbuild_python=false \
+            -Djobs="$jobs"
+    env PATH="$meson_dir:$PATH" "$meson_bin" compile -C "$build_dir"
+    env PATH="$meson_dir:$PATH" "$meson_bin" test -C "$build_dir" --print-errorlogs
+}
+
+clang_cc=${CLANG_CC:-clang}
+clang_cxx=${CLANG_CXX:-clang++}
+gcc_cc=${GNU_CC:-gcc}
+gcc_cxx=${GNU_CXX:-g++}
+
+require_clang "$clang_cxx"
+require_gnu "$gcc_cxx"
+
+run_configuration clang-debug "$clang_cc" "$clang_cxx" debug
+run_configuration clang-release "$clang_cc" "$clang_cxx" release
+run_configuration gcc-debug "$gcc_cc" "$gcc_cxx" debug
+run_configuration gcc-release "$gcc_cc" "$gcc_cxx" release