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musl-cross-make
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Mirorr of https://github.com/richfelker/musl-cross-make to compile musl build tools for mipsel-muslsf
16 Commits 1 Branch 12 Tags 719 KiB
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Rich Felker f872b28199 fix sh/fdpic 64-bit division code in libgcc 
I originally missed the udiv_qrnnd part of the fdpic patch when
forward-porting it because longlong.h moved to a non-obvious location.
however, the original patch was broken anyway; it misordered
instructions at branch delay slots and clobbered in-use registers.

my version of the code is more efficient because it uses knowledge
that __udiv_qrnnd_16 is a pure-PIC function that makes no calls, uses
no static data, and does not clobber r12. this means we only need to
load the instruction address, not the got address, from the function
descriptor to make the call.

the same can be achieved even more efficiently by declaring
__udiv_qrnnd_16 with object type instead of function type and using
the existing non-fdpic asm unmodified. I did not do this because I was
afraid it would be considered a hack unacceptable for upstream.
 		2015-09-24 02:44:28 +00:00
patches fix sh/fdpic 64-bit division code in libgcc 2015-09-24 02:44:28 +00:00
sources add dummy files for empty dirs to include them in git 2015-08-25 19:34:59 +00:00
steps add dummy files for empty dirs to include them in git 2015-08-25 19:34:59 +00:00
Makefile bypass gcc's potentially-broken detection of tls support 2015-09-13 08:29:07 +00:00
README.md add README 2015-08-25 19:58:17 +00:00
config.mak.dist improve sample config.mak 2015-09-13 04:17:08 +00:00

README.md

musl-cross-make

This is a quick and simple makefile-based alternative for producing musl-based cross compilers. In addition to the build system, it provides a number of patches, including:

  • Updated versions of the musl target patches going into upstream GCC

  • Static-PIE support and enabling PIE as default

  • Fixes for SH-specific bugs and bitrot in GCC

  • Support for J2 Core CPU target in GCC & binutils

The current focus is on SH2/J2 Core targets and NOMMU (where PIE is mandatory) since these are not adequately supported by other musl cross-compiler toolchain build systems.

Usage

To build, copy the provided config.mak.dist to config.mak and edit then run make. Parallel builds are supported. The host needs to have suitable gmp/mpfr/mpc libraries installed in the standard library path, or you can add the appropriate --with options to GCC_CONFIG.

At present only GCC 5.2.0 and Binutils 2.25.1 are supported. Backporting of patches is needed to support other versions.

The included patches should also be usable with Gregor's original musl-cross or other build systems, if desired.