[Buildroot] [PATCH 1/2] package/gmpc: needs -lm

[Peter Seiderer <ps.report@gmx.net>]

Hello Fabrice, Thomas,

On Fri, 8 Nov 2019 22:04:42 +0100, Thomas Petazzoni <thomas.petazzoni@bootlin.com> wrote:

> On Tue, 29 Oct 2019 22:40:45 +0100
> Fabrice Fontaine <fontaine.fabrice@gmail.com> wrote:
>
> > gmpc forgets to link with -lm:
> >
> > /home/buildroot/autobuild/instance-2/output-1/host/opt/ext-toolchain/bin/../lib/gcc/mips-linux-gnu/5.3.0/../../../../mips-linux-gnu/bin/ld: GmpcVolume.o: undefined reference to symbol 'ceil@@GLIBC_2.0'
> > /home/buildroot/autobuild/instance-2/output-1/host/mips64el-buildroot-linux-gnu/sysroot/soft-float/el/lib64/libm.so.6: error adding symbols: DSO missing from command line
> >
> > Fixes:
> >  - http://autobuild.buildroot.org/results/a79e0487135ad90530595d5c6ecc32f9c8cea7c4
> >
> > Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
>
> We need to understand why this is happening now. This package has not
> been modified since July 2017, but suddenly, on October 21, 2019, it
> started failing like this. Why? Was there a change in one of the
> dependencies, that is no longer linked with libm, and that causes this
> problem ?

Maybe the same cause/problem as in the libv4l case regarding libatomic,
evaluating vs. not evaluationg the *.la files (see [1])?

Regards,
Peter

[1] http://lists.busybox.net/pipermail/buildroot/2019-October/264928.html

>
> I think I already asked this in the past: when you fix an issue, don't
> just fix the issue, but explain why the issue is happening, especially
> in situations like these.
>
> Thanks!
>
> Thomas