Commits on Jul 9, 2024

1. ompi_setup_fc.m4: use -Wl,-ld_classic if supported …

   Per open-mpi#12427, on MacOS, add
   -Wl,-ld_classic to the Fortran wrapper compiler if that flag is
   needed.
   
   Specifically, Open MPI has used -Wl,-commons,use_dylibs for decades to
   support common symbols (e.g., MPI_BOTTOM) in the Fortran bindings.
   There is a window of Xcode versions where this switch was effectively
   disabled; it effectively required the additional -Wl,-ld_classic
   switch to force the use of the "old" Apple linker (that still
   supported -Wl,-commons,use_dylibs).  Update the configury to test
   whether we need -Wl,-ld_classic or not.
   
   Signed-off-by: Jeff Squyres <[email protected]>

   

   jsquyres committed Jul 9, 2024
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