Configure and build GCC natively for C, C++, Fortran languages. Find or build GCC prerequisite libraries GMP, MPFR, and MPC from CMake.

Platforms working include:

• Linux (Intel / AMD CPU)
• macOS: Currently requires GCC fork for Apple Silicon cmake -Dgcc_url=https://github.com/iains/gcc-darwin-arm64/archive/refs/heads/master-wip-apple-si.zip

Numerous platforms require specific patches that we don't currently implement. The easiest way may be to clone their GCC fork as we do for Apple Silicon.

This CMake project can be more convenient than manually downloading and configuring each project. We assume fundamental prerequisites such as libc, Autotools, Make, CMake are present. The 3-stage compiler bootstrap is enabled to help ensure a working, performant GCC.

Build prerequisites are:

• CentOS: dnf install cmake make autoconf autoconf-archive libtool
• Ubuntu: apt install cmake make autoconf autoconf-archive libtool
• macOS: brew install cmake autoconf autoconf-archive libtool

Automake is not required unless modifying GCC source code.

If one wishes to install GCC prerequisites via a package manager, optionally do like:

• macOS brew install gmp mpfr libmpc isl

These options may be changed by adding the CMake configure arguments:

Set GCC version : -Dgcc_version=14.2.0

disable ISL for Graphite optimizations : -Disl=off

disable C++ : -Dcpp=off

disable Fortran : -Dfortran=off

disable Gcov coverage tool :-Dgcov=off

disable link time optimization : -Dlto=off

disable Zstd : -Dzstd=off

disable Zstd compression (fallback to Zlib) : -Dzstd=off

We set GCC options like:

• --disable-nls to avoid gettext dependencies, make GCC output English only
• --disable-multilib to avoid building 32-bit libraries on 64-bit systems

This CMake project assumes the system already has Autotools, Make, and a new-enough C/C++ compiler. GCC will take 10s of minutes to build, even on a powerful workstation. The following commands build GCC and install it to ~/gcc-devel. By default, a recent release of GCC is built using source from the GCC GitHub mirror.

cmake -Dprefix=$HOME/gcc-devel -P build.cmake

This script sets environment variables during the build phase to avoid missing .so messages when building GCC.

Specify a URL say from GCC snapshots like:

 cmake -Dgcc_url=https://gcc.gnu.org/pub/gcc/snapshots/LATEST-15/gcc-15-20240526.tar.xz -P build.cmake

macOS Apple Silicon may need the GCC gcc-darwin-arm64 fork:

cmake -Dgcc_url=https://github.com/iains/gcc-darwin-arm64/archive/refs/heads/master-wip-apple-si.zip -P build.cmake

--with-system-zlib for macOS avoids incompatible Zlib GCC-vendored headers. Linux is OK with or without this flag.

Source a script like gcc-dev.sh to use this GCC.

Troubleshooting