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pthread related build error on CentOS 6


From: Tom G. Christensen
Subject: pthread related build error on CentOS 6
Date: Thu, 26 Jan 2017 21:15:43 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.6.0

Hello,

My daily full gnulib bootstrap on CentOS 6 has stopped working with this build error: gcc -std=gnu99 -fvisibility=hidden -g -O2 -Wall -o git-merge-changelog git-merge-changelog.o libgnu.a -lm -lm -lm -lm -lm -lm -lm -lm -lm -lm -lm
libgnu.a(lock.o): In function `glthread_rwlock_init_for_glibc':
/home/tgc/projects/gnulib/build/gllib/glthread/lock.c:46: undefined reference to `pthread_rwlockattr_init' /home/tgc/projects/gnulib/build/gllib/glthread/lock.c:53: undefined reference to `pthread_rwlockattr_setkind_np' /home/tgc/projects/gnulib/build/gllib/glthread/lock.c:59: undefined reference to `pthread_rwlockattr_destroy'
collect2: ld returned 1 exit status
make[4]: *** [git-merge-changelog] Error 1

Adding -pthread or -lpthread allows the link to succeed.

The build then fails again at:
gcc -std=gnu99 -g -O2 -Wall -o test-fstrcmp test-fstrcmp.o ../gllib/libgnu.a -lm -lm -lm -lm -lm -lm -lm -lm -lm -lm -lm
../gllib/libgnu.a(lock.o): In function `glthread_rwlock_init_for_glibc':
/home/tgc/projects/gnulib/build/gllib/glthread/lock.c:46: undefined reference to `pthread_rwlockattr_init' /home/tgc/projects/gnulib/build/gllib/glthread/lock.c:53: undefined reference to `pthread_rwlockattr_setkind_np' /home/tgc/projects/gnulib/build/gllib/glthread/lock.c:59: undefined reference to `pthread_rwlockattr_destroy'
collect2: ld returned 1 exit status
make[4]: *** [test-fstrcmp] Error 1

Manually linking test-fstrcmp with -pthread then allows the build to complete.

-tgc



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