This test requires -std=legacy which is not supported by flang.
Currently we check if the flag is supported and add if so,
but run the test anyway if not supported.
This has been failing on our bots for a long time but was not
noticed due to some issues reporting NOEXE failures.
Executable Missing Tests (1):
test-suite :: Fortran/UnitTests/fcvs21_f95/FM509.test
This fixes llvm_singlesource to allow you to pass a list
of source files (which used to work when it was a macro).
(this was done for multisource in cecca649c310cfa78076ef96dadea315ac176efa)
If the flag is not supported we remove the test from the list
of source files. This means it's disabled for flang and
enabled for gfortran.