This makefile was included in the byacc distribution as Makefile.old
It was slightly updated to fit our needs.
Berkeley yacc itself is in the public domain, but SPDX/REUSE provides
no good way to represent this. In keeping with that spirit, I chose
CC0 as the license for my modifications, which SPDX can represent.
This way, heirloom-devtools is only linked to a libc with a CDDL-compatible
license, making it fully redistributable. Heirloom yacc doesn't work properly
with musl libc, but luckily byacc can do its job just fine, so we only need
heirloom lex now.
Thanks to the more complete libc, and bash being available, heirloom's
bootstrap is significantly simplified.
This replaces the previous sed hackery with a proper patch, and removes
a few more libc functions that meslibc is missing.
The binary name is changed to "byacc" so it doesn't get overwritten by
heirloom yacc.
The bsearch() replacement code comes from an earlier version of byacc.
This is meant to replace heirloom yacc for compiling pre-musl parsers.
Unlike heirloom yacc, it's in the public domain, and can be linked with
meslibc without licensing concerns.
Gábor Stefanik