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https://github.com/webmproject/libwebp.git
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abb5482731
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
114 lines
4.0 KiB
CMake
114 lines
4.0 KiB
CMake
## Check for SIMD extensions.
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function(webp_check_compiler_flag WEBP_SIMD_FLAG)
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unset(WEBP_HAVE_FLAG_${WEBP_SIMD_FLAG} CACHE)
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check_c_source_compiles("
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#include \"${CMAKE_CURRENT_LIST_DIR}/../src/dsp/dsp.h\"
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int main(void) {
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#if !defined(WEBP_USE_${WEBP_SIMD_FLAG})
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this is not valid code
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#endif
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return 0;
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}
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" WEBP_HAVE_FLAG_${WEBP_SIMD_FLAG}
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)
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if(WEBP_HAVE_FLAG_${WEBP_SIMD_FLAG})
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set(WEBP_HAVE_${WEBP_SIMD_FLAG} 1 PARENT_SCOPE)
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else()
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set(WEBP_HAVE_${WEBP_SIMD_FLAG} 0 PARENT_SCOPE)
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endif()
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endfunction()
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# those are included in the names of WEBP_USE_* in c++ code.
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set(WEBP_SIMD_FLAGS "SSE2;SSE41;AVX2;MIPS32;MIPS_DSP_R2;NEON;MSA")
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set(WEBP_SIMD_FILE_EXTENSIONS "_sse2.c;_sse41.c;_avx2.c;_mips32.c;_mips_dsp_r2.c;_neon.c;_msa.c")
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if(MSVC)
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# MSVC does not have a SSE4 flag but AVX2 support implies
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# SSE4 support.
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set(SIMD_ENABLE_FLAGS "/arch:SSE2;/arch:AVX2;/arch:AVX2;;;;")
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set(SIMD_DISABLE_FLAGS)
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else()
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set(SIMD_ENABLE_FLAGS "-msse2;-msse4.1;-mavx2;-mips32;-mdspr2;-mfpu=neon;-mmsa")
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set(SIMD_DISABLE_FLAGS "-mno-sse2;-mno-sse4.1;-mno-avx2;;-mno-dspr2;;-mno-msa")
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endif()
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set(WEBP_SIMD_FILES_TO_NOT_INCLUDE)
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set(WEBP_SIMD_FILES_TO_INCLUDE)
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set(WEBP_SIMD_FLAGS_TO_INCLUDE)
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if(${ANDROID})
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if(${ANDROID_ABI} STREQUAL "armeabi-v7a")
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# This is because Android studio uses the configuration
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# "-march=armv7-a -mfloat-abi=softfp -mfpu=vfpv3-d16"
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# that does not trigger neon optimizations but should
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# (as this configuration does not exist anymore).
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set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mfpu=neon ")
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endif()
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endif()
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list(LENGTH WEBP_SIMD_FLAGS WEBP_SIMD_FLAGS_LENGTH)
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math(EXPR WEBP_SIMD_FLAGS_RANGE "${WEBP_SIMD_FLAGS_LENGTH} - 1")
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foreach(I_SIMD RANGE ${WEBP_SIMD_FLAGS_RANGE})
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list(GET WEBP_SIMD_FLAGS ${I_SIMD} WEBP_SIMD_FLAG)
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# First try with no extra flag added as the compiler might have default flags
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# (especially on Android).
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unset(WEBP_HAVE_${WEBP_SIMD_FLAG} CACHE)
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set(CMAKE_REQUIRED_FLAGS)
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webp_check_compiler_flag(${WEBP_SIMD_FLAG})
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if(NOT WEBP_HAVE_${WEBP_SIMD_FLAG})
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list(GET SIMD_ENABLE_FLAGS ${I_SIMD} SIMD_COMPILE_FLAG)
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set(CMAKE_REQUIRED_FLAGS ${SIMD_COMPILE_FLAG})
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webp_check_compiler_flag(${WEBP_SIMD_FLAG})
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else()
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set(SIMD_COMPILE_FLAG " ")
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endif()
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# Check which files we should include or not.
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list(GET WEBP_SIMD_FILE_EXTENSIONS ${I_SIMD} WEBP_SIMD_FILE_EXTENSION)
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file(GLOB SIMD_FILES "${CMAKE_CURRENT_LIST_DIR}/../"
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"src/dsp/*${WEBP_SIMD_FILE_EXTENSION}"
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)
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if(WEBP_HAVE_${WEBP_SIMD_FLAG})
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# Memorize the file and flags.
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foreach(FILE ${SIMD_FILES})
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list(APPEND WEBP_SIMD_FILES_TO_INCLUDE ${FILE})
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list(APPEND WEBP_SIMD_FLAGS_TO_INCLUDE ${SIMD_COMPILE_FLAG})
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endforeach()
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else()
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# Remove the file from the list.
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foreach(FILE ${SIMD_FILES})
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list(APPEND WEBP_SIMD_FILES_NOT_TO_INCLUDE ${FILE})
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endforeach()
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# Explicitly disable SIMD.
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if(SIMD_DISABLE_FLAGS)
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list(GET SIMD_DISABLE_FLAGS ${I_SIMD} SIMD_COMPILE_FLAG)
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include(CheckCCompilerFlag)
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if(SIMD_COMPILE_FLAG)
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unset(HAS_COMPILE_FLAG CACHE)
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check_c_compiler_flag(${SIMD_COMPILE_FLAG} HAS_COMPILE_FLAG)
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if(HAS_COMPILE_FLAG)
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# Do one more check for Clang to circumvent CMake issue 13194.
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if(COMMAND check_compiler_flag_common_patterns)
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# Only in CMake 3.0 and above.
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check_compiler_flag_common_patterns(COMMON_PATTERNS)
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else()
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set(COMMON_PATTERNS)
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endif()
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set(CMAKE_REQUIRED_DEFINITIONS ${SIMD_COMPILE_FLAG})
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check_c_source_compiles("int main(void) {return 0;}" FLAG2
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FAIL_REGEX "warning: argument unused during compilation:"
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${COMMON_PATTERNS}
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)
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if(NOT FLAG2)
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unset(HAS_COMPILE_FLAG CACHE)
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endif()
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endif()
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if(HAS_COMPILE_FLAG)
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set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${SIMD_COMPILE_FLAG}")
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endif()
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endif()
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endif()
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endif()
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endforeach()
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