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CMake: Use -ffat-lto-objects for static libraries with ltcg and GCC

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CMake <= 3.19 adds the '-fno-fat-lto-objects' compiler flag
unconditionally when CMAKE_INTERPROCEDURAL_OPTIMIZATION is enabled.

This is fine for shared libraries but static ones need the opposite
compiler flag.

Task-number: QTBUG-89426
Change-Id: Ie5f48178803a270f6d94408f7a8e85d379eb123c
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
(cherry picked from commit 9563be2870b85309e163db950fefcb9200cac6f4)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
This commit is contained in:
Christophe Giboudeaux 2021-01-13 09:19:32 +01:00 committed by Qt Cherry-pick Bot
parent 59785478c3
commit 4bbff3fa21
1 changed files with 8 additions and 0 deletions
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8
cmake/QtModuleHelpers.cmake
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@ -82,6 +82,14 @@ function(qt_internal_add_module target)
endif()
endif()
if(FEATURE_ltcg AND GCC AND is_static_lib)
# CMake <= 3.19 appends -fno-fat-lto-objects for all library types if
# CMAKE_INTERPROCEDURAL_OPTIMIZATION is enabled. Static libraries need
# the opposite compiler option.
# (https://gitlab.kitware.com/cmake/cmake/-/issues/21696)
target_compile_options(${target} PRIVATE -ffat-lto-objects)
endif()
if (ANDROID)
qt_android_apply_arch_suffix("${target}")
endif()