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remove Clang warnings with unused arch arguments.

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This is duplicating code from compiler flag checking that was once
added (then reverted to CMake) as the problem seem to be on the
clang side as detailed in:
http://public.kitware.com/Bug/view.php?id=13194

I also tried to remove a similar warning with pthreads but there
is also an issue on the clang side:
https://llvm.org/bugs/show_bug.cgi?id=7798

Change-Id: I5b0061f0f71e49b493c5ee0c98f70533c28164bd
This commit is contained in:
Vincent Rabaud 2016-12-19 17:07:33 +01:00
parent 67c25ad5b4
commit abb5482731
1 changed files with 17 additions and 0 deletions
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17
cmake/cpu.cmake
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@ -87,6 +87,23 @@ foreach(I_SIMD RANGE ${WEBP_SIMD_FLAGS_RANGE})
if(SIMD_COMPILE_FLAG)
unset(HAS_COMPILE_FLAG CACHE)
check_c_compiler_flag(${SIMD_COMPILE_FLAG} HAS_COMPILE_FLAG)
if(HAS_COMPILE_FLAG)
# Do one more check for Clang to circumvent CMake issue 13194.
if(COMMAND check_compiler_flag_common_patterns)
# Only in CMake 3.0 and above.
check_compiler_flag_common_patterns(COMMON_PATTERNS)
else()
set(COMMON_PATTERNS)
endif()
set(CMAKE_REQUIRED_DEFINITIONS ${SIMD_COMPILE_FLAG})
check_c_source_compiles("int main(void) {return 0;}" FLAG2
FAIL_REGEX "warning: argument unused during compilation:"
${COMMON_PATTERNS}
)
if(NOT FLAG2)
unset(HAS_COMPILE_FLAG CACHE)
endif()
endif()
if(HAS_COMPILE_FLAG)
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${SIMD_COMPILE_FLAG}")
endif()