+ LIB_PTHREAD=
+ if test $ac_cv_header_pthread_h = yes; then
+ dnl We cannot use AC_SEARCH_LIBS here, because on OSF/1 5.1 pthread_join
+ dnl is defined as a macro which expands to __phread_join, and libpthread
+ dnl contains a definition for __phread_join but none for pthread_join.
+ dnl Also, FreeBSD 9 puts pthread_create in libpthread and pthread_join
+ dnl in libc, whereas on IRIX 6.5 the reverse is true; so check for both.
+ AC_CACHE_CHECK([for library containing pthread_create and pthread_join],
+ [gl_cv_lib_pthread],
+ [gl_saved_libs=$LIBS
+ gl_cv_lib_pthread=
+ for gl_lib_prefix in '' '-lpthread'; do
+ LIBS="$gl_lib_prefix $gl_saved_libs"
+ AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <pthread.h>
+ void *noop (void *p) { return p; }]],
+ [[pthread_t pt;
+ void *arg = 0;
+ pthread_create (&pt, 0, noop, arg);
+ pthread_join (pthread_self (), &arg);]])],
+ [if test -z "$gl_lib_prefix"; then
+ gl_cv_lib_pthread="none required"
+ else
+ gl_cv_lib_pthread=$gl_lib_prefix
+ fi])
+ test -n "$gl_cv_lib_pthread" && break
+ done
+ LIBS="$gl_saved_libs"
+ ])
+ if test "$gl_cv_lib_pthread" != "none required"; then
+ LIB_PTHREAD="$gl_cv_lib_pthread"
+ fi
+ fi