diff options
| author | Björn Esser <besser82@fedoraproject.org> | 2022-01-19 17:26:14 +0100 |
|---|---|---|
| committer | Björn Esser <besser82@fedoraproject.org> | 2022-01-19 20:47:38 +0100 |
| commit | 6a0ce19ce1cb594cdec19bacc9fc7a38156e38da (patch) | |
| tree | 29ae61eac7c12bbb307fae53df316eccc45a3e9d /Modules/FortranCInterface | |
| parent | d79c40b1d5c189b9e2f3948993de7081fe44d647 (diff) | |
| download | cmake-6a0ce19ce1cb594cdec19bacc9fc7a38156e38da.tar.gz | |
FortranCInterface: Fix compatibility with GCC gfortran 12 LTO
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.
The static libraries, however, must be build with LTO and non-LTO objects,
as that will ensure the verify step will operate on IPO objects, if building
those is requested by the system compiler flags.
Fixes: #23123
Signed-off-by: Björn Esser <besser82@fedoraproject.org>
Diffstat (limited to 'Modules/FortranCInterface')
| -rw-r--r-- | Modules/FortranCInterface/CMakeLists.txt | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/Modules/FortranCInterface/CMakeLists.txt b/Modules/FortranCInterface/CMakeLists.txt index 13e4498ad9..ce0bc10c8e 100644 --- a/Modules/FortranCInterface/CMakeLists.txt +++ b/Modules/FortranCInterface/CMakeLists.txt @@ -102,6 +102,19 @@ set_property(TARGET symbols PROPERTY POSITION_INDEPENDENT_CODE 1) add_executable(FortranCInterface main.F call_sub.f ${call_mod}) target_link_libraries(FortranCInterface PUBLIC symbols) +# If IPO is enabled here, GCC gfortran >= 12.0 will obfuscate +# the strings of the return values in the compiled executable, +# which we use to regex match against later. +# The static libraries must be build with IPO and non-IPO objects, +# as that will ensure the verify step will operate on IPO objects, +# if requested by the system compiler flags. +if(CMAKE_Fortran_COMPILER_ID STREQUAL "GNU" AND + CMAKE_Fortran_COMPILER_VERSION VERSION_GREATER_EQUAL 12) + target_compile_options(FortranCInterface PRIVATE "-fno-lto") + target_compile_options(myfort PRIVATE "-flto=auto" "-ffat-lto-objects") + target_compile_options(symbols PRIVATE "-flto=auto" "-ffat-lto-objects") +endif() + file(GENERATE OUTPUT exe-$<CONFIG>.cmake CONTENT [[ set(FortranCInterface_EXE "$<TARGET_FILE:FortranCInterface>") ]]) |