[ltt-dev] libust link failure on Android

[Mathieu Desnoyers]

* pplists at me.com (pplists at me.com) wrote:
> Hi,
>
> I'm trying to get ust working on Android, but got stuck:
>
> out/[snip]/marker.o: In function `destroy_ust_marker':
> /android-lttng/external/ust-posix/libust/marker.c:1463: undefined reference to `__start___ust_marker_ptrs'
> out/[snip]/marker.o: In function `init_ust_marker':
> /android-lttng/external/ust-posix/libust/marker.c:1458: undefined reference to `__start___ust_marker_ptrs'
> /android-lttng/external/ust-posix/libust/marker.c:1458: undefined reference to `__stop___ust_marker_ptrs'
> /android-lttng/prebuilt/linux-x86/toolchain/arm-eabi-4.4.0/arm-eabi/bin/ld:
> out/[snip]/libust.so: hidden symbol `__stop___ust_marker_ptrs' isn't defined
> /android-lttng/prebuilt/linux-x86/toolchain/arm-eabi-4.4.0/arm-eabi/bin/ld: 
> final link failed: Nonrepresentable section on output
>
>
> I suspect differences between gnu and android 'ld', but since I can't figure out where the missing symbols are supposed to come from, it's hard to work out a fix.
>
> If anyone could shed some light on how and where the __start__xyz/__stop__xyz symbols are defined I'd very happy!

See http://gnu.feld-it.at/software/libc/FAQ.html (1.10)

These are automatically generated linker symbols. So either you'll have
to figure out how to add support for them in your linker, or create your
own linker script to support libust.

We need that to do the glue between the markers/tracepoints sections and
the extern symbols around the beginning and end of these sections (as
visible from C).

Thanks,

Mathieu

>
> Regards,
> Per

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-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com