feat(initial): added portable mfem build system

build-check/meson.build

@@ -0,0 +1,18 @@
+message('C compiler: ' + cc.get_id())
+message('C++ compiler: ' + cpp.get_id())
+
+if not cpp.has_header('memory') or not cpp.compiles('''
+  #include <type_traits>
+  int main() { static_assert(__cplusplus >= 201703L); return 0; }
+''', name: 'C++17 language support')
+  error('MFEM 4.10 requires a C++17-or-newer compiler.')
+endif
+
+cmake_program = find_program('cmake', required: true)
+# With meson-python, the generated native file pins this to the interpreter
+# building the wheel. For command-line builds, PATH controls the selection.
+python_build = python_mod.find_installation(required: true, pure: false)
+
+if meson.is_cross_build()
+  message('Cross build: ' + build_machine.system() + ' -> ' + host_machine.system())
+endif