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FortranCInterface: Fix compatibility with GCC gfortran 12 LTO

Björn Esser requested to merge besser82/cmake:topic/besser82/gcc12_gfortran_lto into master

Since version 12.0 the GCC Fortran compiler has implemented "WG5/N1942", which causes, if link-time opmization is enabled, obfuscation of hard-coded string values in the compiler objects and its resulting ELF-binaries.

This causes the CMake-internal detection of the mangling scheme for the naming of subroutines to fail. Thus we must ensure to have any link-time optimization features to be disabled on the executable file we perform the detection on.

Fixes: #23123 (closed)
Signed-off-by: Björn Esser besser82@fedoraproject.org
Backport: release
Topic-rename: FortranCInterface-gcc-12-lto

Edited by Brad King

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