From 32bd3908ddef1e33fa4851c67853c55ff91bad1f Mon Sep 17 00:00:00 2001 From: Cory Fields Date: Fri, 4 Aug 2017 15:43:01 -0400 Subject: [PATCH] build: always attempt to enable targeted sse42 cxxflags This avoids a counter-intuitive drop in performance when manually adjusting the flags. (cherry picked from commit bitcoin/bitcoin@9baca419852749d22a0d15e5a8b0492015f2dfaf) --- configure.ac | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) diff --git a/configure.ac b/configure.ac index 9bc68fb69..0458da4a7 100644 --- a/configure.ac +++ b/configure.ac @@ -328,14 +328,13 @@ if test "x$CXXFLAGS_overridden" = "xno"; then AX_CHECK_COMPILE_FLAG([-Wself-assign],[CXXFLAGS="$CXXFLAGS -Wno-self-assign"],,[[$CXXFLAG_WERROR]]) AX_CHECK_COMPILE_FLAG([-Wunused-local-typedef],[CXXFLAGS="$CXXFLAGS -Wno-unused-local-typedef"],,[[$CXXFLAG_WERROR]]) AX_CHECK_COMPILE_FLAG([-Wdeprecated-register],[CXXFLAGS="$CXXFLAGS -Wno-deprecated-register"],,[[$CXXFLAG_WERROR]]) - - # Check for optional instruction set support. Enabling these does _not_ imply that all code will - # be compiled with them, rather that specific objects/libs may use them after checking for runtime - # compatibility. - AX_CHECK_COMPILE_FLAG([-msse4.2],[[SSE42_CXXFLAGS="-msse4.2"]],,[[$CXXFLAG_WERROR]]) - fi +# Check for optional instruction set support. Enabling these does _not_ imply that all code will +# be compiled with them, rather that specific objects/libs may use them after checking for runtime +# compatibility. +AX_CHECK_COMPILE_FLAG([-msse4.2],[[SSE42_CXXFLAGS="-msse4.2"]],,[[$CXXFLAG_WERROR]]) + TEMP_CXXFLAGS="$CXXFLAGS" CXXFLAGS="$CXXFLAGS $SSE42_CXXFLAGS" AC_MSG_CHECKING(for assembler crc32 support)