To summarize: 1. there's a lot of --enable switches: --enable-sse2 use SSE2 [default=no] --enable-sse3 use SSE3 [default=no] --enable-ssse3 use SSSE3 [default=no] --enable-sse4.1 use SSE4.1 [default=no] --enable-sse4.2 use SSE4.2 [default=no] --enable-sse4 use SSE4 [default=no] --enable-sse4a use SSE4a [default=no] --enable-popcnt use POPCNT [default=no] 2. that implicitly enable other switches: AS_IF([test "x${enable_popcnt}" != "xno"], [ enable_sse3="yes" ]) AS_IF([test "x${enable_sse4a}" != "xno"], [ enable_popcnt="yes" enable_sse3="yes" ]) AS_IF([test "x${enable_sse4}" != "xno"], [ enable_popcnt="yes" enable_sse4_2="yes" ]) #... 3. and those in turn enable some defines: if test "x${enable_sse4a}" != "xno"; then CXXFLAGS="$CXXFLAGS -DMARISA_USE_SSE4A -msse4a" elif test "x${enable_sse4}" != "xno"; then CXXFLAGS="$CXXFLAGS -DMARISA_USE_SSE4 -msse4" elif test "x${enable_sse4_2}" != "xno"; then CXXFLAGS="$CXXFLAGS -DMARISA_USE_SSE4_2 -msse4.2" #... 4. which do some implicit deps again: #ifdef MARISA_USE_SSE4A #ifndef MARISA_USE_SSE3 #define MARISA_USE_SSE3 #endif // MARISA_USE_SSE3 #ifndef MARISA_USE_POPCNT #define MARISA_USE_POPCNT #endif // MARISA_USE_POPCNT #endif // MARISA_USE_SSE4A #ifdef MARISA_USE_SSE4 #ifndef MARISA_USE_SSE4_2 #define MARISA_USE_SSE4_2 #endif // MARISA_USE_SSE4_2 #endif // MARISA_USE_SSE4 /* ... */ Someone *needs* to take a serious look at those flags, remove dumb aliases (sse4), put proper REQUIRED_USE and preferably figure out what it all does.
*** Bug 523720 has been marked as a duplicate of this bug. ***
And done. Added necessary REQUIRED_USE and killed sse4 as it's only alias to sse4.2.
