We should use GCC's configuration to configure which CPU instructions to use

Makefile

@@ -31,6 +31,7 @@ all: ceph-config
 	ln -s /lib /lib64
 
 	tar xf ceph-14.2.4.tar.gz
+	patch -Np1 -d ceph-14.2.4 < ceph-14.2.4-fix_cpu_detection.patch
 	patch -Np1 -d ceph-14.2.4 < ceph-14.2.4-fix_tests.patch
 	cd ceph-14.2.4 && ./do_cmake.sh -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_INSTALL_SYSCONFDIR=/etc -DCMAKE_INSTALL_LIBEXECDIR=/lib -DWITH_SPDK=OFF -DWITH_RDMA=OFF -DWITH_RADOSGW_AMQP_ENDPOINT=OFF
 	$(MAKE) -C ceph-14.2.4/build npm_config_cache=/build/.npm

ceph-14.2.4-fix_cpu_detection.patch

+diff -uNr ceph-14.2.4/cmake/modules/SIMDExt.cmake ceph-14.2.4-fix_cpu_detection/cmake/modules/SIMDExt.cmake
+--- ceph-14.2.4/cmake/modules/SIMDExt.cmake	2019-09-14 03:37:41.000000000 +0930
++++ ceph-14.2.4-fix_cpu_detection/cmake/modules/SIMDExt.cmake	2019-10-22 20:54:05.941235917 +1030
+@@ -48,32 +48,53 @@
+ elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "i386|i686|amd64|x86_64|AMD64")
+   set(HAVE_INTEL 1)
+   if(CMAKE_SYSTEM_PROCESSOR MATCHES "i686|amd64|x86_64|AMD64")
+-    CHECK_C_COMPILER_FLAG(-msse HAVE_INTEL_SSE)
++    execute_process(COMMAND bash -c "gcc -Q --help=target | grep '\\-msse\\s' | grep -c enabled" OUTPUT_VARIABLE RUN_RESULT OUTPUT_STRIP_TRAILING_WHITESPACE)
++    if (${RUN_RESULT})
++      set(HAVE_INTEL_SSE 1)
++    endif()
+     if(HAVE_INTEL_SSE)
+       set(SIMD_COMPILE_FLAGS "${SIMD_COMPILE_FLAGS} -msse")
+     endif()
+     if(CMAKE_SYSTEM_PROCESSOR MATCHES "amd64|x86_64|AMD64")
+-      CHECK_C_COMPILER_FLAG(-msse2 HAVE_INTEL_SSE2)
++      execute_process(COMMAND bash -c "gcc -Q --help=target | grep '\\-msse2\\s' | grep -c enabled" OUTPUT_VARIABLE RUN_RESULT OUTPUT_STRIP_TRAILING_WHITESPACE)
++      if (${RUN_RESULT})
++        set(HAVE_INTEL_SSE2 1)
++      endif()
+       if(HAVE_INTEL_SSE2)
+         set(SIMD_COMPILE_FLAGS "${SIMD_COMPILE_FLAGS} -msse2")
+       endif()
+-      CHECK_C_COMPILER_FLAG(-msse3 HAVE_INTEL_SSE3)
++      execute_process(COMMAND bash -c "gcc -Q --help=target | grep '\\-msse3\\s' | grep -c enabled" OUTPUT_VARIABLE RUN_RESULT OUTPUT_STRIP_TRAILING_WHITESPACE)
++      if (${RUN_RESULT})
++        set(HAVE_INTEL_SSE3 1)
++      endif()
+       if(HAVE_INTEL_SSE3)
+         set(SIMD_COMPILE_FLAGS "${SIMD_COMPILE_FLAGS} -msse3")
+       endif()
+-      CHECK_C_COMPILER_FLAG(-mssse3 HAVE_INTEL_SSSE3)
++      execute_process(COMMAND bash -c "gcc -Q --help=target | grep '\\-mssse3\\s' | grep -c enabled" OUTPUT_VARIABLE RUN_RESULT OUTPUT_STRIP_TRAILING_WHITESPACE)
++      if (${RUN_RESULT})
++        set(HAVE_INTEL_SSSE3 1)
++      endif()
+       if(HAVE_INTEL_SSSE3)
+         set(SIMD_COMPILE_FLAGS "${SIMD_COMPILE_FLAGS} -mssse3")
+       endif()
+-      CHECK_C_COMPILER_FLAG(-mpclmul HAVE_INTEL_PCLMUL)
++      execute_process(COMMAND bash -c "gcc -Q --help=target | grep '\\-mpclmul\\s' | grep -c enabled" OUTPUT_VARIABLE RUN_RESULT OUTPUT_STRIP_TRAILING_WHITESPACE)
++      if (${RUN_RESULT})
++        set(HAVE_INTEL_PCLMUL 1)
++      endif()
+       if(HAVE_INTEL_PCLMUL)
+         set(SIMD_COMPILE_FLAGS "${SIMD_COMPILE_FLAGS} -mpclmul")
+       endif()
+-      CHECK_C_COMPILER_FLAG(-msse4.1 HAVE_INTEL_SSE4_1)
++      execute_process(COMMAND bash -c "gcc -Q --help=target | grep '\\-msse4\\.1\\s' | grep -c enabled" OUTPUT_VARIABLE RUN_RESULT OUTPUT_STRIP_TRAILING_WHITESPACE)
++      if (${RUN_RESULT})
++        set(HAVE_INTEL_SSE4_1 1)
++      endif()
+       if(HAVE_INTEL_SSE4_1)
+         set(SIMD_COMPILE_FLAGS "${SIMD_COMPILE_FLAGS} -msse4.1")
+       endif()
+-      CHECK_C_COMPILER_FLAG(-msse4.2 HAVE_INTEL_SSE4_2)
++      execute_process(COMMAND bash -c "gcc -Q --help=target | grep '\\-msse4\\.2\\s' | grep -c enabled" OUTPUT_VARIABLE RUN_RESULT OUTPUT_STRIP_TRAILING_WHITESPACE)
++      if (${RUN_RESULT})
++        set(HAVE_INTEL_SSE4_2 1)
++      endif()
+       if(HAVE_INTEL_SSE4_2)
+         set(SIMD_COMPILE_FLAGS "${SIMD_COMPILE_FLAGS} -msse4.2")
+       endif()
+diff -uNr ceph-14.2.4/src/test/test_arch.cc ceph-14.2.4-fix_cpu_detection/src/test/test_arch.cc
+--- ceph-14.2.4/src/test/test_arch.cc	2019-09-14 03:37:41.000000000 +0930
++++ ceph-14.2.4-fix_cpu_detection/src/test/test_arch.cc	2019-10-22 21:31:22.290390502 +1030
+@@ -69,7 +69,7 @@
+   expected = strstr(flags, " sse4_1 ") ? 1 : 0;
+   EXPECT_EQ(expected, ceph_arch_intel_sse41);
+ 
+-  expected = (strstr(flags, " sse3 ") || strstr(flags, " ssse3 ")) ? 1 : 0;
++  expected = (strstr(flags, " sse3 ") || strstr(flags, " ssse3 ")) || strstr(flags, " pni ")) ? 1 : 0;
+   EXPECT_EQ(expected, ceph_arch_intel_sse3);
+ 
+   expected = strstr(flags, " ssse3 ") ? 1 : 0;