Building tests from multiple object files

[Florian Weimer]

On 04/12/2016 02:16 PM, Andreas Schwab wrote:
> Florian Weimer <fweimer@redhat.com> writes:
>
>> The glibc makefiles do not provide a simple way to assemble a test binary
>> from multiple object files.  One way to see this is to apply the attached
>> harmless patch and then run
>>
>>    make subdirs=elf check
>>
>> (or whatever you do to run the test suite).  Linking the test fails with:
>>
>> /home/fweimer/src/gnu/glibc/build/elf/tst-tlsalign-vars.o: In function
>> `use_errno':
>> /home/fweimer/src/gnu/glibc/git/elf/tst-tlsalign-vars.c:36: undefined
>> reference to `__libc_errno'
>> collect2: error: ld returned 1 exit status
>> ../Rules:154: recipe for target
>> '/home/fweimer/src/gnu/glibc/build/elf/tst-tlsalign-extern' failed
>>
>> The apparent cause is that the second object file for the test was built
>> against internal glibc headers.
>
> No, the problem is that it is built with MODULE_NAME=libc.  It should be
> nonlib, so it needs to be put on test-extras (and on extra-test-objs to
> get dependency right).

Thanks, this fixed the build issue for me, also for my actual test.

Florian