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| author | Cory Fields <cory-nospam-@coryfields.com> | 2017-08-04 15:43:01 -0400 |
|---|---|---|
| committer | Cory Fields <cory-nospam-@coryfields.com> | 2017-08-04 15:43:04 -0400 |
| commit | 9baca419852749d22a0d15e5a8b0492015f2dfaf (patch) | |
| tree | 551c1a2fcbb61e8c991e19ca2af9db511f6f7ab2 | |
| parent | f66c59650527022b4f7abd98ff0a1a4e4741bd34 (diff) | |
build: always attempt to enable targeted sse42 cxxflags
This avoids a counter-intuitive drop in performance when manually adjusting the
flags.
| -rw-r--r-- | configure.ac | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/configure.ac b/configure.ac index aea5d7160c..ba523d3762 100644 --- a/configure.ac +++ b/configure.ac @@ -258,14 +258,13 @@ if test "x$CXXFLAGS_overridden" = "xno"; then AX_CHECK_COMPILE_FLAG([-Wunused-local-typedef],[CXXFLAGS="$CXXFLAGS -Wno-unused-local-typedef"],,[[$CXXFLAG_WERROR]]) AX_CHECK_COMPILE_FLAG([-Wdeprecated-register],[CXXFLAGS="$CXXFLAGS -Wno-deprecated-register"],,[[$CXXFLAG_WERROR]]) AX_CHECK_COMPILE_FLAG([-Wimplicit-fallthrough],[CXXFLAGS="$CXXFLAGS -Wno-implicit-fallthrough"],,[[$CXXFLAG_WERROR]]) - - # Check for optional instruction set support. Enabling these does _not_ imply that all code will - # be compiled with them, rather that specific objects/libs may use them after checking for runtime - # compatibility. - AX_CHECK_COMPILE_FLAG([-msse4.2],[[SSE42_CXXFLAGS="-msse4.2"]],,[[$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) |