* [Buildroot] [autobuild.buildroot.net] Your build results for 2016-09-29
[not found] <20160930063021.782B5103059@stock.ovh.net>
@ 2016-10-01 17:32 ` Yann E. MORIN
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From: Yann E. MORIN @ 2016-10-01 17:32 UTC (permalink / raw)
To: buildroot
All,
On 2016-09-30 08:30 +0200, Thomas Petazzoni spake thusly:
> Build failures related to your packages:
> arm | snappy-1ff9be9b8fafc8528ca9... | http://autobuild.buildroot.net/results/f0abe301816e39eb4ae26d3e8cd42d90901d5ac5
This one is simple to explain: the libstdc++ from that toolchain uses
pthread symbols, like pthread_mutex_lock, pthread_once and so on...
Since this build is a static build, dependent libraries are not pulled
in automagically by way of the NEEDED flag, since they do not exist in
static libs.
Fixing the build is trivial: we could add -pthread to both of CFLAGS and
LIBS when calling configure. I have a patch that does exactly that.
However, looking more deeper into the output of the build, one can see
that snappy's buildsystem is usung libtool. It generates a libsnappy.la
file that seem to contain the require -pthread info:
16 # Linker flags that cannot go in dependency_libs.
17 inherited_linker_flags=' -pthread'
18
19 # Libraries that this one depends upon.
20 dependency_libs=' /home/ymorin/dev/buildroot/O/host/opt/ext-toolchain/bin/../lib/gcc/arm-buildroot-uclinux-uclibcgnueabi/5.4.0/../../../../arm-buildroot-uclinux-uclibcgnueabi/lib/libstdc++.la -pthread'
But this is not picked up when linking the unittest program.
We could well disable the build of the unittest program, but there is
something that seems fishy nonetheless: why doesn't libtool grab it from
libsnappy.la in the first place?
Anyway, I'll post the patch for review...
Regards,
Yann E. MORIN.
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