mozilla@gentoo.org Gentoo Mozilla Team Use Clang compiler instead of GCC Build with user-specified compiler optimizations (-Os, -O0, -O1, -O2, -O3) from CFLAGS (unsupported) Enable assertions to allow for easier debugging of programs that link to spidermonkey -- note this will often crash software on regular end-user systems Enable Link Time Optimization (LTO) Use the system-wide dev-libs/icu instead of bundled -- note, only takes effect when icu flag is enabled