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gcc
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Legend:
- + - stable
- ~ - unstable
- M - hardmask
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USE flags
- ada - Build the ADA language (GNAT) frontend
- altivec - Add support for optimizations for G4 and G5/ppc970 processors
- build - !!internal use only!! DO NOT SET THIS FLAG YOURSELF!, used for creating build images and the first half of bootstrapping [make stage1]
- cet - Enable support for Intel Control Flow Enforcement Technology (CET)
- custom-cflags - Build with user-specified CFLAGS (unsupported)
- cxx - Build support for C++ (bindings, extra libraries, code generation, ...)
- d - Enable support for the D programming language
- debug - Enable extra debug codepaths, like asserts and extra output. If you want to get meaningful backtraces see https://wiki.gentoo.org/wiki/Project:Quality_Assurance/Backtraces
- doc - Add extra documentation (API, Javadoc, etc). It is recommended to enable per package instead of globally
- elibc_FreeBSD - ELIBC setting for systems that use the FreeBSD C library
- examples - Install examples, usually source code
- fixed-point - Enable fixed-point arithmetic support for MIPS targets in gcc (Warning: significantly increases compile time!)
- fortran - Add support for fortran
- go - Build the GCC Go language frontend.
- graphite - Add support for the framework for loop optimizations based on a polyhedral intermediate representation
- hardened - Activate default security enhancements for toolchain (gcc, glibc, binutils)
- java - Add support for Java
- jit - Enable libgccjit so other applications can embed gcc for Just-In-Time compilation. This will slow down the compiler a bit as it forces all of the toolchain to be shared libs.
- libssp - Build SSP support into a dedicated library rather than use the code in the C library (DO NOT ENABLE THIS IF YOU DON'T KNOW WHAT IT DOES)
- lto - Build using Link Time Optimizations (LTO)
- mpx - Enable support for Intel Memory Protection Extensions (MPX)
- multilib - On 64bit systems, if you want to be able to compile 32bit and 64bit binaries
- nls - Add Native Language Support (using gettext - GNU locale utilities)
- nptl - Enable support for Native POSIX Threads Library, the new threading module (requires linux-2.6 or better usually)
- objc - Build support for the Objective C code language
- objc++ - Build support for the Objective C++ language
- objc-gc - Build support for the Objective C code language Garbage Collector
- openmp - Build support for the OpenMP (support parallel computing), requires >=sys-devel/gcc-4.2 built with USE="openmp"
- pch - Enable precompiled header support for faster compilation at the expense of disk space and memory (>=sys-devel/gcc-3.4 only)
- pgo - Build GCC using Profile Guided Optimization (PGO)
- pie - Build programs as Position Independent Executables (a security hardening technique)
- sanitize - Build support for various sanitizer functions (ASAN/TSAN/etc...)
- source - Zip the sources and install them
- ssp - Build packages with stack smashing protector on by default
- static - !!do not set this during bootstrap!! Causes binaries to be statically linked instead of dynamically
- systemtap - enable systemtap static probe points
- test - Enable dependencies and/or preparations necessary to run tests (usually controlled by FEATURES=test but can be toggled independently)
- valgrind - Enable valgrind annotations for gcc internals (useful for gcc debugging).
- vanilla - Do not add extra patches which change default behaviour; DO NOT USE THIS ON A GLOBAL SCALE as the severity of the meaning changes drastically
- vtv - Build support for virtual table verification (a C++ hardening feature)
- zstd - Enable support for ZSTD compression
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