Created attachment 791024 [details] emerge --info Starting with PHP 8.0, opcache-jit is added (amd64/x86/aarch64 only). opcache-jit is enabled by default and can be disabled by --disable-opcache-jit. Two new optional dependencies are introduced along with opcache-jit: 1. dev-util/oprofile According to https://wiki.php.net/rfc/jit , oprofile is used for opcache.jit_debug . opcache.jit_debug - JIT debug control options, where each bit enabling some debugging options. Default - 0. ... (1<<6) - provide information about JIt-ed code for Linux Oprofile ... 2. >=dev-libs/capstone-3.0.0 By looking into ext/opcache/jit/zend_jit_disasm.c , it is used for disassembly. TL;DR: It is MANDATORY for aarch64 builds. If capstone is installed, PHP uses it. If capstone is missing and we are building for amd64/x86, PHP would use ext/opcache/jit/libudis86 . Otherwise (no capstone && building for aarch64), no disasm is built. I don't use PHP for a long time. Information above are inferred from PHP's source code (config.m4, ...). I apologise in advance for anything misleading. Earlier today, I depclean-ed oprofile and portage reports `existing preserved libs` on libopagent.so.1.0.1 by opcache.so (php-8.1.8).
oprofile is now gone, and capstone can be toggled with a ./configure flag. If anything it should probably go behind USE=debug.
