Public bug reported:
We have software that uses semaphores but not pthreads. Therefore, our
code links against librt, as documented in the sem_post man page. This
worked fine in 10.04 and 11.04, but not in 11.10.
> cat a.c
#include <semaphore.h>
int main()
{
sem_t *mysem;
int ret;
ret = sem_post(mysem);
return 0;
}
> gcc -g -lrt -o a a.c
/tmp/ccUadHKv.o: In function `main':
a.c:8: undefined reference to `sem_post'
collect2: ld returned 1 exit status
ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: libc6-dev 2.13-20ubuntu5
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu3
Architecture: amd64
Date: Fri Oct 14 12:30:58 2011
SourcePackage: eglibc
UpgradeStatus: Upgraded to oneiric on 2011-10-07 (6 days ago)
** Affects: eglibc (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug oneiric
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https://bugs.launchpad.net/bugs/874418
Title:
linking against librt doesn't provide sem_post
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