[J-core] [musl] musl-cross-make / litecross improvements

[Szabolcs Nagy]

* Szabolcs Nagy <nsz at port70.net> [2016-05-03 22:16:22 +0200]:
> * Rich Felker <dalias at libc.org> [2016-05-03 14:02:30 -0400]:
> > On Tue, May 03, 2016 at 01:39:43PM +0200, Szabolcs Nagy wrote:
> > > i think the usr/ and lib64/ symlinks are useful
> > > (so it can be used as rootfs without fiddling
> > > with etc/ld-musl*.path).
> > 
> > Yes. Is there a good way to override that in gcc or should we just
> > make the symlinks?
> > 
> 
> output/lib64 can be eliminated by
> COMMON_CONFIG += --libdir=/lib
> 
> output/x86_64-linux-musl/lib64 install path is trickier:
> it is controlled by the $toolexeclibdir make variable.
> which is set according to $CC -print-multi-os-directory
> which is controlled by multilib and multilib_defaults from
> $CC -dumpspecs which comes from multilib.h generated by
> genmultilib based on parameters from config/i386/t-linux64
> 

it was not clear if the t-linux64 thing could be overridden, but

GCC_CONFIG += --with-multilib-list=

fixes it (the lib dir is lib/ then).