CMake helper macro for detecting corner case when compiler doesn't support intrinsics

CMakeLists.txt

@@ -108,6 +108,7 @@ include(RootBuildOptions)
 include(RootNewMacros)
 include(CheckCompiler)
 include(CheckAssembler)
+include(CheckIntrinsics)
 
 #---Enable CCache ------------------------------------------------------------------------------
 if(ccache)

builtins/zlib/CMakeLists.txt

@@ -88,7 +88,20 @@ set(ZLIB_INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR} CACHE INTERNAL "")
 set(ZLIB_INCLUDE_DIRS ${CMAKE_CURRENT_SOURCE_DIR} CACHE INTERNAL "")
 
 if((CMAKE_SYSTEM_PROCESSOR MATCHES "amd64|x86_64|AMD64|X86_64|aarch64") AND (CMAKE_SYSTEM_NAME MATCHES "Linux"))
+   # Calling helper to avoid using old unsupported binutils (e.g. with SL6)
+   # macro is returning extra ${ROOT_DEFINITIONS} used after in ZLIB-CF
    root_check_assembler()
+   # Calling helper to avoid using old unsupported binutils (e.g. with Centos7
+   # and native gcc compiler 4.8.5)
+   # Macros are returning bools SSE_SUPPORT & AVX2_SUPPORT
+   root_check_sse41()
+   root_check_avx2()
+   if(SSE_SUPPORT OR AVX2_SUPPORT)
+      set(ZLIB_CF TRUE CACHE INTERNAL "")
+   endif()
+endif()
+
+if(ZLIB_CF)
    add_library(ZLIB STATIC ${ZLIB_PUBLIC_HEADERS} ${ZLIBCF_PRIVATE_HEADERS} ${ZLIBCF_SOURCES})
 else()
    add_library(ZLIB STATIC ${ZLIB_PUBLIC_HEADERS} ${ZLIB_PRIVATE_HEADERS} ${ZLIB_SOURCES})
@@ -98,7 +111,7 @@ set_target_properties(ZLIB PROPERTIES C_VISIBILITY_PRESET hidden POSITION_INDEPE
 target_include_directories(ZLIB INTERFACE $<BUILD_INTERFACE:${ZLIB_INCLUDE_DIR}>)
 
 if((CMAKE_SYSTEM_PROCESSOR MATCHES "amd64|x86_64|AMD64|X86_64") AND (CMAKE_SYSTEM_NAME MATCHES "Linux"))
-    target_compile_options(ZLIB PRIVATE -Wno-unused-function -O3 -mpclmul ${ROOT_DEFINITIONS})
+   target_compile_options(ZLIB PRIVATE -Wno-unused-function -O3 -mpclmul ${ROOT_DEFINITIONS})
 else()
     target_compile_options(ZLIB PRIVATE -O3)
 endif()

cmake/modules/CheckIntrinsics.cmake

+include(CheckCXXSourceRuns)
+
+# Helper function for checking if compiler is supporting AVX2 intrinsics
+function(root_check_avx2)
+    CHECK_CXX_COMPILER_FLAG("-mavx" AVX2_FLAG)
+    CHECK_CXX_SOURCE_COMPILES("#include <immintrin.h> \n int main () {__m256i xmm =  _mm256_set1_epi64x(0); xmm =  _mm256_add_epi64(xmm,xmm);};" AVX2_COMPILATION)
+    CHECK_CXX_SOURCE_RUNS("#include <immintrin.h> \n int main () {__m256i xmm =  _mm256_set1_epi64x(0); xmm =  _mm256_add_epi64(xmm,xmm);};" AVX2_RUN)
+    if(AVX2_FLAG AND AVX2_COMPILATION AND AVX2_RUN)
+      set(AVX2_SUPPORT TRUE PARENT_SCOPE)
+    endif()
+endfunction()
+
+# Helper function for checking if compiler is supporting SSE4.1 intrinsics
+function(root_check_sse41)
+   CHECK_CXX_COMPILER_FLAG("-msse4.1" SSE_FLAG)
+   CHECK_CXX_SOURCE_COMPILES("#include <smmintrin.h> \n int main () {__m128 xmm=_mm_set_ps1(0.0); _mm_ceil_ps(xmm);};" SSE_COMPILATION)
+   CHECK_CXX_SOURCE_RUNS("#include <smmintrin.h> \n int main () {__m128 xmm=_mm_set_ps1(0.0); _mm_ceil_ps(xmm);};" SSE_RUN)
+   if(SSE_FLAG AND SSE_COMPILATION AND SSE_RUN)
+      set(SSE_SUPPORT TRUE PARENT_SCOPE)
+   endif()
+endfunction()