Re: [PATCH v3 2/3] build: fix musl-targeting toolchain test

[Isaac Dunham <ibid.ag@gmail.com>]

On Sun, Jun 28, 2015 at 11:08:20PM +0200, Shiz wrote:
> the old test was broken in that it would never fail on a toolchains built
> without dynamic linking support, leading to the wrapper script possibly being
> installed on compilers that do not support it. in addition, the new test is
> portable across compilers: the old test only worked on GCC.
> 
> the new test works by testing whether the toolchain libc defines __GLIBC__:
> most non-musl Linux libc's do define this for compatibility even when they
> are not glibc, so this is a safe bet to check for musl. in addition, the
> compiler runtime would need to have a somewhat glibc-compatible ABI in the
> first place, so any non-glibc compatible libc's compiler runtime might not
> work. it is safer to disable these cases by default and have the user enable
> the wrappers manually there using --enable-wrapper if they certain it works.

A long while back, someone reported successfully using a FreeBSD gcc
to build musl, then using that + musl-gcc to build programs that
worked using the Linux emulation layer on FreeBSD.
They submitted a patch with a BSD makefile at that point.

Thanks,
Isaac Dunham