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compile_flag: add multiple flag search

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This commit is contained in:
Danny Robson 2022-08-23 13:35:26 +10:00
parent f3994915e3
commit 0b6d0ea507
1 changed files with 32 additions and 0 deletions
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32
compile_flag.cmake
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@ -9,6 +9,11 @@ include(CMakeCheckCompilerFlagCommonPatterns)
# -fsanitize=address is impossible with this macro. # -fsanitize=address is impossible with this macro.
# #
# Instead, we roll out own. Yay cmake... # Instead, we roll out own. Yay cmake...
#
# Accepts a second parameter that names an output variable. It will be set to
# 1 if-and-only-if the flag was accepted by the compiler. Otherwise it will be
# left untouched. It is up to the user to reset this flag between invocations
# if necessary.
macro (append_compile_flag _flag) macro (append_compile_flag _flag)
string (MAKE_C_IDENTIFIER ${_flag} _name) string (MAKE_C_IDENTIFIER ${_flag} _name)
@ -48,5 +53,32 @@ macro (append_compile_flag _flag)
if (compile_flag_${_name}) if (compile_flag_${_name})
set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${_flag}") set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${_flag}")
if (${ARGC} GREATER_EQUAL 2)
set(${ARGV1} 1)
endif()
endif() endif()
endmacro(append_compile_flag) endmacro(append_compile_flag)
# Find the first compile flag in the list of arguments that is supported by
# the compiler and set it.
macro (append_first_compile_flag)
message(CHECK_START "First CXXFLAGS ${ARGV}")
foreach(__append_first_compile_flag__flag ${ARGV})
set(__append_first_compile_flag__test 0)
append_compile_flag(
${__append_first_compile_flag__flag}
__append_first_compile_flag__test
)
if (${__append_first_compile_flag__test})
message(CHECK_PASS "Found ${__append_first_compile_flag__flag}")
break()
endif()
endforeach()
if (NOT ${__append_first_compile_flag__test})
message(CHECK_FAIL "No valid flags")
endif ()
endmacro()