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correctly detect unsupported compiler flags

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in gcc `-Wno-unsupported-something` will not be an error or even a warning,
so cmake will think the flag is supported. But if there's any other
warning during compilation, for any reason, unknown option will
be a warning too. Or an error when -Werror, even if that "other warning"
would not be an error on itself.

So we need to detect whether `-Wno-unsupported-something` is *really*
supported. Luckily, `-Wunsupported-something` will always fail with an
error.

So, whenever there's a need to detect if -Wno-something is supported,
test -Wsomething instead.
This commit is contained in:
Sergei Golubchik 2018-02-06 02:38:01 +01:00
parent 4418abb267
commit 0c25e58db6
1 changed files with 7 additions and 7 deletions
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14
cmake/check_compiler_flag.cmake
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@ -32,25 +32,25 @@ MACRO (MY_CHECK_CXX_COMPILER_FLAG flag)
SET(CMAKE_REQUIRED_FLAGS "${SAVE_CMAKE_REQUIRED_FLAGS}")
ENDMACRO()
FUNCTION(MY_CHECK_AND_SET_COMPILER_FLAG flag)
FUNCTION(MY_CHECK_AND_SET_COMPILER_FLAG flag_to_set)
# At the moment this is gcc-only.
# Let's avoid expensive compiler tests on Windows:
IF(WIN32)
RETURN()
ENDIF()
MY_CHECK_C_COMPILER_FLAG(${flag})
MY_CHECK_CXX_COMPILER_FLAG(${flag})
STRING(REGEX REPLACE "[-,= +]" "_" result "${flag}")
STRING(REGEX REPLACE "^-Wno-" "-W" flag_to_check ${flag_to_set})
MY_CHECK_C_COMPILER_FLAG(${flag_to_check})
MY_CHECK_CXX_COMPILER_FLAG(${flag_to_check})
STRING(REGEX REPLACE "[-,= +]" "_" result "${flag_to_check}")
FOREACH(lang C CXX)
IF (HAVE_${lang}_${result})
IF(ARGN)
FOREACH(type ${ARGN})
SET(CMAKE_${lang}_FLAGS_${type} "${CMAKE_${lang}_FLAGS_${type}} ${flag}" PARENT_SCOPE)
SET(CMAKE_${lang}_FLAGS_${type} "${CMAKE_${lang}_FLAGS_${type}} ${flag_to_set}" PARENT_SCOPE)
ENDFOREACH()
ELSE()
SET(CMAKE_${lang}_FLAGS "${CMAKE_${lang}_FLAGS} ${flag}" PARENT_SCOPE)
SET(CMAKE_${lang}_FLAGS "${CMAKE_${lang}_FLAGS} ${flag_to_set}" PARENT_SCOPE)
ENDIF()
ENDIF()
ENDFOREACH()
ENDFUNCTION()