Using clang in Gentoo
#emerge llvm clang dragonegg
#vi /etc/portage/env/clang
CC=clang
CXX=clang++
CFLAGS="-O2 -march=native -mtune=native -pipe"
CXXFLAGS="-O2 -march=native -mtune=native -pipe"
LDFLAGS="-Wl,--as-needed" ### \#vi /etc/portage/env/gcc
CC="gcc"
CXX="g++"
CFLAGS="-O2 -march=native -mtune=native -pipe"
CXXFLAGS="-O2 -march=native -mtune=native -pipe"
LDFLAGS="-Wl,--as-needed" ### \#vi /etc/portage/package.env
---------------CORE PACKAGES TO BUILD WITH GCC:
sys-apps/which gcc
sys-fs/reiserfsprogs gcc
sys-libs/ncurses gcc
sys-libs/zlib gcc
sys-apps/busybox gcc
sys-fs/e2fsprogs gcc
sys-devel/binutils gcc
sys-libs/glibc gcc
sys-devel/dragonegg gcc
dev-libs/openssl gcc
sys-boot/grub gcc
---------------USER PACKAGES TO BUILD WITH GCC:
media-libs/mesa gcc
---------------USER PACKAGES TO BUILD WITH clang:
app-misc/screen clang
###启用链接时间优化
#vi /usr/local/bin/clang-ar
#!/bin/sh
firstarg=${1}
shift
exec /usr/bin/ar "${firstarg}" --plugin /usr/lib/llvm/LLVMgold.so "${@}"
#chmod +x /usr/local/bin/clang-ar
#vi /etc/portage/env/clang-lt
CC='clang'
CXX='clang++'
CFLAGS="${CFLAGS} -O4"
CXXFLAGS="${CXXFLAGS} -O4"
LDFLAGS="${LDFLAGS} -O4 -Wl,-plugin,/usr/lib/llvm/LLVMgold.so"
AR='/usr/local/bin/clang-ar'
RANLIB=':'
NM='nm --plugin /usr/lib64/llvm/LLVMgold.so'
###加入distcc支持