[lttng-dev] 2.13-rc2 fails to build with buildroot crosscompiler

[Norbert Lange]

Am Do., 20. Mai 2021 um 16:37 Uhr schrieb Michael Jeanson
<mjeanson at efficios.com>:
>
> On 2021-05-20 9:52 a.m., Norbert Lange via lttng-dev wrote:
> > Hello,
> >
> > many tests fail to build, apparently because transitive dependencies
> > are not found.
> > I managed to patch out building the test sub-directory, at which
> > points the errors are gone,
> > I dont know how to fix it with automake, seems like
> > /tmp/ZBuild/build/lttng-libust-2.13.0-rc2/src/lib/lttng-ust/.libs
> > should be added to library search paths.
> >
> > Norbert
>
> The libtool integration with autotools should be handling these transitive
> dependencies but somehow doesn't seem to work in your environment. A
> workaround could be to add the liblttng-ust-common.la file to all the test file:///home/noppl/git/buildroot/0001-package-lttng-bump-to-2.13rc2-WIP.patch

 > binaries _LDADD where liblttng-ust.la is already present, for example:
>
> ust_fields_compatapi1_LDADD = \
>         $(top_builddir)/src/lib/lttng-ust/liblttng-ust.la \
>         $(top_builddir)/src/lib/lttng-ust-common/liblttng-ust-common.la \
>         $(DL_LIBS)
>
> Can you check if this works?

I suppose it would, but there are many many of these errors also by
linking libraries build in the test directory, would cost some time
and I am not able to triage automake/libtool issues.
Is that the solution upstream wants to use?

I attached a patch for https://buildroot.org/ to pick the current
lttng rc2. using buildroot is easy (but timeconsuming if you build the
cross-compiler aswell):

make O=/tmp/build defconfig
make O=/tmp/build menuconfig

Pick your hosts/prefered architecture in Target options
In toolchain menu pick kernel headers + c library type (glibc for me)

Enable:
Target packages -> Libraries -> Other -> lttng-libust
Target packages -> Debugging, profiling and benchmark -> lttng-tools

Then
make O=/tmp/build

Norbert
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