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compile_flag: also pass parameters to the linker during the test

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This commit is contained in:
Danny Robson 2018-07-04 16:24:30 +10:00
parent 1c5ded53b3
commit 9198bae72d
1 changed files with 14 additions and 4 deletions
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20
compile_flag.cmake
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@ -1,5 +1,13 @@
include(CheckCXXCompilerFlag)
include(CheckCXXSourceCompiles)
# Test if a compiler flag is supported.
#
# Note: We _cannot_ use check_cxx_compiler_flag because it will not add the
# flag to the linker parameters and some compiler flags _must_ be passed to
# the linker but the test it performs fails to do so. eg, checking for
# -fsanitize=address is impossible with this macro.
#
# Instead, we roll out own. Yay cmake...
macro (append_compile_flag _flag)
string (MAKE_C_IDENTIFIER ${_flag} _name)
@ -14,14 +22,16 @@ macro (append_compile_flag _flag)
string (REGEX MATCH "^-Wno-(.+)$" compile_flag_inverse ${_flag})
if ("x" STREQUAL "x${compile_flag_inverse}")
check_cxx_compiler_flag (${_flag} compile_flag${_name})
set(CMAKE_REQUIRED_FLAGS "${CMAKE_CXX_FLAGS} ${_flag}")
else ()
string (REGEX REPLACE "-Wno-" "" _inverse_flag ${_flag})
check_cxx_compiler_flag ("-W${_inverse_flag}" compile_flag${_name})
endif ()
set(CMAKE_REQUIRED_FLAGS "${CMAKE_CXX_FLAGS} -W${_inverse_flag}")
endif ()
if (compile_flag${_name})
check_cxx_source_compiles("int main(int,char**) { return 0; }" compile_flag_${_name})
endif ()
if (compile_flag_${_name})
set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${_flag}")
endif()
endmacro(append_compile_flag)