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cmake: extensions: Add check_compiler_flag function

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This function has presents an easy-to-use interface that wraps the two
CMake built-in functions check_c_compiler_flag() and
check_cxx_compiler_flag().

Signed-off-by: Sebastian Bøe <sebastian.boe@nordicsemi.no>
This commit is contained in:
Sebastian Bøe 2017-11-23 18:40:37 +01:00 • committed by Anas Nashif
commit 935e95be41
1 changed files with 28 additions and 0 deletions
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28
cmake/extensions.cmake
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@ -1,4 +1,5 @@
include(CheckCCompilerFlag) include(CheckCCompilerFlag)
include(CheckCXXCompilerFlag)
######################################################## ########################################################
# Table of contents # Table of contents
@ -637,7 +638,34 @@ endfunction()
# compiler lacks support. *_cc_option was ported from KBuild, see # compiler lacks support. *_cc_option was ported from KBuild, see
# cc-option in # cc-option in
# https://www.kernel.org/doc/Documentation/kbuild/makefiles.txt # https://www.kernel.org/doc/Documentation/kbuild/makefiles.txt
# Writes 1 to the output variable 'ok' for the language 'lang' if
# the flag is supported, otherwise writes 0.
# #
# lang must be C or CXX
#
# Usage:
#
# check_compiler_flag(C "-Wall" my_check)
# print(my_check) # my_check is now 1
function(check_compiler_flag lang option ok)
string(MAKE_C_IDENTIFIER check${option}_${lang} ${ok})
if(${lang} STREQUAL C)
check_c_compiler_flag(${option} ${${ok}})
else()
check_cxx_compiler_flag(${option} ${${ok}})
endif()
if(${${${ok}}})
set(ret 1)
else()
set(ret 0)
endif()
set(${ok} ${ret} PARENT_SCOPE)
endfunction()
function(target_cc_option target scope option) function(target_cc_option target scope option)
string(MAKE_C_IDENTIFIER check${option} check) string(MAKE_C_IDENTIFIER check${option} check)
check_c_compiler_flag(${option} ${check}) check_c_compiler_flag(${option} ${check})