GCC Builds

This repository contains the definitions and scripts to build optimized toolchains for x86_64, armv7 and aarch64 (aka arm64 and armv8) architectures. The build process has been unified to create both GCC binaries and sysroots in a single, efficient compilation pipeline.

Building the Toolchains

Use the build.sh script to build the sysroots and GCC binaries using Docker. The current restriction is that the container must run in x86_64. The sysroots for other architectures are built using cross-compilation from x86_64.

Using the Build Script

Building the Toolchains

For the default host (x86_64)

./build.sh 14.3.0 x86_64 .
./build.sh 14.3.0 armv7 .
./build.sh 14.3.0 aarch64 .

Building for Different Hosts

./build.sh 14.3.0 x86_64 . aarch64 # Build an aarch64 gcc that can target x86_64.
./build.sh 14.3.0 x86_64 . x86_64  # Build an x86_64 gcc that can target x86_64.
./build.sh 14.3.0 x86_64 .         # Shorthand for the above.

Output

The build process generates optimized toolchain archives:

• gcc-toolchain-14.3.0-x86_64.tar.xz
• gcc-toolchain-14.3.0-armv7.tar.xz
• gcc-toolchain-14.3.0-aarch64.tar.xz

These archives contain both the GCC binaries and the corresponding sysroot, providing a complete hermetic toolchain for each target architecture.

If you have specified a host other than the default x86_64, the archive names will be keyed by host:

• gcc-toolchain-14.3.0-x86_64-host-aarch64.tar.xz
• gcc-toolchain-14.3.0-armv7-host-aarch64.tar.xz
• gcc-toolchain-14.3.0-aarch64-host-aarch64.tar.xz

Linkers

Each toolchain ships with multiple linkers:

• ld / ld.bfd and ld.gold from binutils (GNU ld is the default).
• ld.lld from LLD, built from source as part of the same pipeline.

LLD is built from the LLVM sources alongside GCC and binutils. Because LLD is a single, inherently cross-target linker, one x86_64 host build links for every supported target. To use it instead of GNU ld, pass -fuse-ld=lld to the compiler:

gcc -fuse-ld=lld -o hello hello.c