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cmake/modules/AddCompilerFlags.cmake
| Show First 20 Lines • Show All 69 Lines • ▼ Show 20 Lines | |||||
| endmacro() | endmacro() | ||||
| macro(remove_compiler_flags) | macro(remove_compiler_flags) | ||||
| remove_c_compiler_flags(${ARGN}) | remove_c_compiler_flags(${ARGN}) | ||||
| remove_cxx_compiler_flags(${ARGN}) | remove_cxx_compiler_flags(${ARGN}) | ||||
| endmacro() | endmacro() | ||||
| # Note that CMake does not provide any facility to check that a linker flag is | # Note that CMake does not provide any facility to check that a linker flag is | ||||
| # supported by the compiler, but most linker will just drop any unsupported flag | # supported by the compiler. | ||||
| # (eventually with a warning). | # However since CMake 3.2 introduced the CMP0056 policy, the | ||||
| # CMAKE_EXE_LINKER_FLAGS variable is used by the try_compile function, so there | |||||
| # is a workaround that allow for testing the linker flags. | |||||
| function(add_linker_flag) | function(add_linker_flag) | ||||
| foreach(f ${ARGN}) | foreach(f ${ARGN}) | ||||
| sanitize_variable("have_linker_" ${f} FLAG_IS_SUPPORTED) | |||||
| # Save the current linker flags | |||||
| set(SAVE_CMAKE_EXE_LINKERFLAGS ${CMAKE_EXE_LINKER_FLAGS}) | |||||
| string(APPEND CMAKE_EXE_LINKER_FLAGS " ${f}") | string(APPEND CMAKE_EXE_LINKER_FLAGS " ${f}") | ||||
| # CHECK_CXX_COMPILER_FLAG calls CHECK_CXX_SOURCE_COMPILES which in turn | |||||
| # calls try_compile, so it will check our flag | |||||
| CHECK_CXX_COMPILER_FLAG("" ${FLAG_IS_SUPPORTED}) | |||||
| # If the flag is not supported restore CMAKE_EXE_LINKER_FLAGS | |||||
| if(NOT ${FLAG_IS_SUPPORTED}) | |||||
| set(CMAKE_EXE_LINKER_FLAGS ${SAVE_CMAKE_EXE_LINKERFLAGS}) | |||||
| endif() | |||||
| endforeach() | endforeach() | ||||
| set(CMAKE_EXE_LINKER_FLAGS ${CMAKE_EXE_LINKER_FLAGS} PARENT_SCOPE) | set(CMAKE_EXE_LINKER_FLAGS ${CMAKE_EXE_LINKER_FLAGS} PARENT_SCOPE) | ||||
| endfunction() | endfunction() | ||||