Skip OpenMP tests on old compilers.

test cases/common/190 openmp/meson.build

@@ -1,5 +1,19 @@
 project('openmp', 'c', 'cpp')
 
+cc = meson.get_compiler('c')
+if cc.get_id() == 'gcc' and cc.version().version_compare('<4.2.0')
+  error('MESON_SKIP_TEST gcc is too old to support OpenMP.')
+endif
+if cc.get_id() == 'clang' and cc.version().version_compare('<3.7.0')
+  error('MESON_SKIP_TEST clang is too old to support OpenMP.')
+endif
+if cc.get_id() == 'msvc' and cc.version().version_compare('<17')
+  error('MESON_SKIP_TEST msvc is too old to support OpenMP.')
+endif
+if host_machine.system() == 'darwin'
+  error('MESON_SKIP_TEST macOS does not support OpenMP.')
+endif
+
 openmp = dependency('openmp')
 
 exec = executable('exec',