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GNU: Do not use "fat-lto-objects" flags for IPO on Apple platforms

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Fat LTO objects contain both traditional object code and the LTO bitcode
IR, but the GNU compiler does not support them on Apple platforms.
A compile error is raised when `-f[no-]fat-lto-objects` flags are used,
so avoid them.

This also implies that static Fortran libraries cannot be built with IPO.

Fixes: #25931
This commit is contained in:
René Bertin
2024-04-24 21:35:23 +02:00
committed by Brad King
parent 7dac16498e
commit f65a6d2cb1
2 changed files with 7 additions and 3 deletions
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2
Modules/Compiler/GNU.cmake
View File

@@ -151,7 +151,7 @@ macro(__compiler_gnu lang)
list(APPEND __lto_flags -flto)
endif()
if(NOT CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 4.7)
if(NOT CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 4.7 AND NOT APPLE)
# '-ffat-lto-objects' introduced since GCC 4.7:
# * https://gcc.gnu.org/onlinedocs/gcc-4.6.4/gcc/Option-Summary.html (no)
# * https://gcc.gnu.org/onlinedocs/gcc-4.7.4/gcc/Option-Summary.html (yes)

8
Modules/FortranCInterface/CMakeLists.txt
View File

@@ -113,11 +113,15 @@ target_link_libraries(FortranCInterface PUBLIC symbols)
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")
if(NOT APPLE)
target_compile_options(myfort PRIVATE "-flto=auto" "-ffat-lto-objects")
endif()
endif()
if(CMAKE_C_COMPILER_ID STREQUAL "GNU" AND
CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 12)
target_compile_options(symbols PRIVATE "-flto=auto" "-ffat-lto-objects")
if(NOT APPLE)
target_compile_options(symbols PRIVATE "-flto=auto" "-ffat-lto-objects")
endif()
endif()
file(GENERATE OUTPUT exe-$<CONFIG>.cmake CONTENT [[