This is a quick and simple makefile-based alternative for producing musl-based cross compilers. The current focus is on SH2/J2 Core targets and NOMMU (where PIE or FDPIC is mandatory) since these are not adequately supported by other musl cross-compiler toolchain build systems, but all musl-supported targets are intended to work.
In addition to the build system, musl-cross-make provides a number of patches, including:
- Updated versions of the musl target patches going into upstream GCC
- Static-PIE support and optionally defaulting to PIE
- Fixes for SH-specific bugs and bitrot in GCC
- Support for J2 Core CPU target in GCC & binutils
- SH/FDPIC ABI support
Most of these patches are integrated in gcc trunk/binutils master. They should also be usable with Gregor's original musl-cross or other build systems, if desired.
Some functionality (SH/FDPIC, and support for J2 specific features) is presently only available with gcc 5.2.0 and binutils 2.25.1.
The build system make be configured by providing a config.mak file in the top-level directory. The only mandatory variable is TARGET, which should contain a gcc target tuple (such as sh2eb-linux-musl), but many more options are available. The top-level config.mak.dist file shows examples, and several full configurations are available in presets/*.
For recent gcc versions that need gmp/mpfr/mpc, suitable versions need to be installed in the default library path, or the appropriate --with configure options need to be added to GCC_CONFIG in config.mak so that the gcc configure process can find them.
After setting up config.mak, simply run make. Parallel builds are supported.
The resulting toolchain will be placed ./output by default, or the OUTPUT directory specified in config.mak. It is sysrooted and can be freely moved to a different location.