v5.0.x: ompi_setup_fc.m4: use -Wl,-ld_classic if supported #12664
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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 <jeff@squyres.com> (cherry picked from commit 84555f0)
bwbarrett
approved these changes
Jul 10, 2024
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Per #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 jeff@squyres.com
(cherry picked from commit 84555f0)
This is the v5.0.x PR corresponding to the main PR #12650.
Refs #12427
FYI @jeffhammond @fxcoudert @ggouaillardet