Flang and PGI don't yet support coarray

test cases/fortran/13 coarray/meson.build

@@ -1,6 +1,13 @@
 project('Fortran coarray', 'fortran',
   meson_version: '>=0.50')
 
+fc = meson.get_compiler('fortran')
+fcid = fc.get_id()
+
+if fcid == 'pgi' or fcid == 'flang'
+  error('MESON_SKIP_TEST: At least through: PGI 19.4 and Flang 7.0 do not support Fortran Coarrays.')
+endif
+
 # coarray is required because single-image fallback is an intrinsic feature
 coarray = dependency('coarray', required : true)