[Buildroot] [PATCH v2] sdl_mixer: fix static linking issue

[Waldemar Brodkorb <wbx@openadk.org>]

Hi,
Thomas Petazzoni wrote,

> Hello,
> 
> On Thu, 8 Dec 2016 18:23:31 +0100, Waldemar Brodkorb wrote:
> 
> > +Pass LDFLAGS while creating binaries.
> > +
> > +Fixes following linking error with uClibc-ng:
> > +br/output/host/usr/lib/gcc/powerpc-buildroot-linux-uclibc/5.4.0/libgcc.a(unwind-dw2-fde-dip.o): In function `_Unwind_Find_FDE':
> > +br/output/build/host-gcc-final-5.4.0/build/powerpc-buildroot-linux-uclibc/libgcc/../../../libgcc/unwind-dw2-fde-dip.c:465: undefined reference to `dl_iterate_phdr'
> > +collect2: error: ld returned 1 exit status
> > +
> > +Since uClibc-ng 1.0.18 a circular dependency between libc and libgcc
> > +exist, when static linking is used. It can be resolved by the compiler
> > +when -static is correctly passed in the linking step.
> 
> musl is also using a "everything in libc" policy. Does this problem
> also occurs with musl? If not, why?

It does not happen with musl because musl does not use libgcc
unwinding functionality for pthread_cancel implementation.
If anyone want to hack on uClibc-ng, I would love to get the libgcc
dependency out. Old linuxthreads didn't use it, so this would
be a good starting point to look at :)

If you would allow to use glibc for static linking, which is
technically possible, you would see the same issue.

best regards
 Waldemar