I propose adding the following global USE flag: jit - Enable just-in-time compilation for improved performance. May prevent use of some PaX memory protection features in Gentoo Hardened.
Current local flags that could probably be unified: app-arch/libzpaq:jit - Enable just-in-time compilation for faster compression (requires SSE2) dev-libs/libpcre:jit - Enable Just-In-Time compilation of regexp bytecode to machine code, through the SLJIT compiler. This feature might conflict wtih security mitigation strategies such as NX/PaX as enabled by Gentoo Hardened. dev-python/pypy:jit - Enable the JIT compiler dev-scheme/racket:jit - Enable just-in-time compiler media-sound/csound:luajit - Use the lua just-in-time compiler dev-lang/luajit instead of dev-lang/lua net-libs/webkit-gtk:jit - Enable JIT javascript compiler (disabling it will cause performance penalty) www-client/epiphany:jit - Allow using net-libs/webkit-gtk that has the JIT javascript compiler enabled www-client/luakit:luajit - Use the lua just-in-time compiler dev-lang/luajit instead of dev-lang/lua, which should make luakit faster. www-client/seamonkey:methodjit - Enable JIT for JavaScript using MethodJIT for faster JS performance. Hardened users can disable this USE-flag to use MPROTECT on grsecurity kernels. www-servers/nginx:pcre-jit - Enable JIT for pcre x11-libs/qt-core:jit - Enables JIT for Javascript usage inside Qt x11-libs/qt-script:jit - Enables JIT for Javascript usage inside Qt x11-libs/qt-webkit:jit - Enable JavaScriptCore just-in-time compiler for faster JavaScript execution -Alexandre.
