>>>>> "Eric" == Eric Blake <eblake@xxxxxxxxxx> writes:
> On 04/14/2010 10:50 AM, Joel J. Adamson wrote:
>> Hello,
>>
>> I have an auto-tooled library installed, and I'm building an
>> application with it. During the ./configure step, the test
>> specified by
>>
>> AC_CHECK_LIB([haploid], [rec_mating],,,[-lm])
>>
>> fails:
>>
>> checking for rec_mating in -lhaploid... no
> Does the corresponding config.log give you more insight into what
> was attempted, and why it might have failed?
Whoops --- I meant to check that before I wrote my message. It seems
I'm having some problems with OpenMP:
configure:3555: checking for rec_mating in -lhaploid
configure:3590: gcc -o conftest -g -O2 conftest.c -lhaploid -lm -lm >&5
/usr/lib/../lib/gcc/x86_64-redhat-linux/4.4.3/../../../libhaploid.so: undefined reference to `GOMP_parallel_end'
/usr/lib/../lib/gcc/x86_64-redhat-linux/4.4.3/../../../libhaploid.so: undefined reference to `omp_get_num_threads'
/usr/lib/../lib/gcc/x86_64-redhat-linux/4.4.3/../../../libhaploid.so: undefined reference to `GOMP_parallel_start'
/usr/lib/../lib/gcc/x86_64-redhat-linux/4.4.3/../../../libhaploid.so: undefined reference to `omp_get_thread_num'
collect2: ld returned 1 exit status
configure:3597: $? = 1
I reconfigured the library with
AC_CHECK_LIB([gomp], [omp_get_num_threads])
recompiled and then reinstalled the library. I added the same check to
configure.ac for the application and everything works now.
Thanks for the insanely quick response: can this go in the FAQ? I've
seen a few people talking about it on the web[1][2][3], and they didn't come up
with this solution (they nor I were smart enough to look in
config.log).
Thanks,
Joel
Footnotes:
[1] http://blog.flameeyes.eu/2008/04/29/i-consider-ac_check_lib-harmful
[2] http://www.keyongtech.com/4420100-ac_check_lib
[3] http://forums.freebsd.org/showthread.php?t=9706
--
Joel J. Adamson
Servedio Lab
University of North Carolina at Chapel Hill
FSF Member #8164
http://www.unc.edu/~adamsonj
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