diff options
Diffstat (limited to 'Modules/Compiler/GNU.cmake')
| -rw-r--r-- | Modules/Compiler/GNU.cmake | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/Modules/Compiler/GNU.cmake b/Modules/Compiler/GNU.cmake index 5930e37..d01054b 100644 --- a/Modules/Compiler/GNU.cmake +++ b/Modules/Compiler/GNU.cmake @@ -52,6 +52,52 @@ macro(__compiler_gnu lang) set(CMAKE_DEPFILE_FLAGS_${lang} "-MD -MT <DEP_TARGET> -MF <DEP_FILE>") endif() + # define flags for linker depfile generation + set(CMAKE_${lang}_LINKER_DEPFILE_FLAGS "LINKER:--dependency-file,<DEP_FILE>") + set(CMAKE_${lang}_LINKER_DEPFILE_FORMAT gcc) + + if(NOT DEFINED CMAKE_${lang}_LINKER_DEPFILE_SUPPORTED) + ## Ensure ninja tool is recent enough... + if(CMAKE_GENERATOR MATCHES "^Ninja") + # Ninja 1.10 or upper is required + execute_process(COMMAND "${CMAKE_MAKE_PROGRAM}" --version + OUTPUT_VARIABLE _ninja_version + ERROR_VARIABLE _ninja_version) + if (_ninja_version MATCHES "[0-9]+(\\.[0-9]+)*") + set (_ninja_version "${CMAKE_MATCH_0}") + endif() + if (_ninja_version VERSION_LESS "1.10") + set(CMAKE_${lang}_LINKER_DEPFILE_SUPPORTED FALSE) + endif() + unset(_ninja_version) + endif() + + if (NOT DEFINED CMAKE_${lang}_LINKER_DEPFILE_SUPPORTED) + ## check if this feature is supported by the linker + execute_process(COMMAND "${CMAKE_${lang}_COMPILER}" -Wl,--help + OUTPUT_VARIABLE _linker_capabilities + ERROR_VARIABLE _linker_capabilities) + if(_linker_capabilities MATCHES "--dependency-file") + set(CMAKE_${lang}_LINKER_DEPFILE_SUPPORTED TRUE) + else() + set(CMAKE_${lang}_LINKER_DEPFILE_SUPPORTED FALSE) + endif() + unset(_linker_capabilities) + endif() + endif() + if (CMAKE_${lang}_LINKER_DEPFILE_SUPPORTED) + set(CMAKE_${lang}_LINK_DEPENDS_USE_LINKER TRUE) + else() + unset(CMAKE_${lang}_LINK_DEPENDS_USE_LINKER) + endif() + + # For now, due to GNU binutils ld bug when LTO is enabled (see GNU bug + # `30568 <https://sourceware.org/bugzilla/show_bug.cgi?id=30568>`_), + # deactivate this feature. + if (NOT DEFINED CMAKE_LINK_DEPENDS_USE_LINKER) + set(CMAKE_LINK_DEPENDS_USE_LINKER FALSE) + endif() + # Initial configuration flags. string(APPEND CMAKE_${lang}_FLAGS_INIT " ") string(APPEND CMAKE_${lang}_FLAGS_DEBUG_INIT " -g") |