Am Freitag, 16. Januar 2015, 13:42:53 schrieb Marc Dietrich: > The GCC specific target function attribute or pragma can be used to enable > architecture depended optimisation options (e.g. SSE) directly in source > files instead of specifing them on the compiler command line. This is > useful when linking files with different compiler options which happens > when using LTO.
no comments? btw. I tested this series with gcc 4.8/4.9 and clang (3.6). To use lto, you have to disable tls, e.g. --disable-gnu-tls. There is some strange interference with tls/asm code/lto I'm not able to resolve to make tls working. To test LTO, you have pass special flags to configure: LTO_GCC="-flto=4 -fuse-ld=gold -fuse-linker-plugin" CFLAGS="$LTO_GCC" CXXFLAGS="$LTO_GCC" LDFLAGS="$LTO_GCC" CC="gcc-4.9" CXX="g++-4.9" LD="ld.gold" AR="gcc-ar-4.9" NM="gcc-nm-4.9" RANLIB="gcc-ranlib-4.9" Marc
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