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Improve the CMake C++ flag checker

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This checks the flag on the compiler AND linker which allows it to work
with flags such as -flto and -fsanitize=address
This commit is contained in:
Matt Clarkson 2015-04-30 14:04:28 +01:00
parent d51ba32791
commit fc883f6742
1 changed files with 8 additions and 9 deletions
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17
cmake/AddCXXCompilerFlag.cmake
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@ -20,18 +20,17 @@ set(__add_cxx_compiler_flag INCLUDED)
include(CheckCXXCompilerFlag)
function(add_cxx_compiler_flag FLAG)
if(ARGV1)
set(VARIANT ${ARGV1})
string(TOLOWER ${VARIANT} VARIANT)
set(VARIANT " ${VARIANT}")
endif()
string(TOUPPER "HAVE_${FLAG}" SANITIZED_FLAG)
string(TOUPPER "HAVE_CXX_FLAG_${FLAG}" SANITIZED_FLAG)
string(REPLACE "+" "X" SANITIZED_FLAG ${SANITIZED_FLAG})
string(REGEX REPLACE "[^A-Za-z_0-9]" "_" SANITIZED_FLAG ${SANITIZED_FLAG})
string(REGEX REPLACE "_+" "_" SANITIZED_FLAG ${SANITIZED_FLAG})
check_cxx_compiler_flag(${FLAG} ${SANITIZED_FLAG})
set(CMAKE_REQUIRED_FLAGS "${FLAG}")
check_cxx_compiler_flag("" ${SANITIZED_FLAG})
if(${SANITIZED_FLAG})
string(REGEX REPLACE "[^A-Za-z_0-9]" "_" VARIANT "${VARIANT}")
string(TOUPPER "${VARIANT}" VARIANT)
set(VARIANT ${ARGV1})
if(ARGV1)
string(TOUPPER "_${VARIANT}" VARIANT)
endif()
set(CMAKE_CXX_FLAGS${VARIANT} "${CMAKE_CXX_FLAGS${VARIANT}} ${FLAG}" PARENT_SCOPE)
endif()
endfunction()