diff options
Diffstat (limited to 'm4/ax_pthread.m4')
| -rw-r--r-- | m4/ax_pthread.m4 | 42 |
1 files changed, 40 insertions, 2 deletions
diff --git a/m4/ax_pthread.m4 b/m4/ax_pthread.m4 index 5fbf9fe0d..07a9cd265 100644 --- a/m4/ax_pthread.m4 +++ b/m4/ax_pthread.m4 @@ -82,7 +82,8 @@ # modified version of the Autoconf Macro, you may extend this special # exception to the GPL to apply to your modified version as well. -#serial 24 +#serial 25 +#arctica-serial 1 AU_ALIAS([ACX_PTHREAD], [AX_PTHREAD]) AC_DEFUN([AX_PTHREAD], [ @@ -334,6 +335,42 @@ for ax_pthread_try_flag in $ax_pthread_flags; do PTHREAD_LIBS="-lpthread" ;; + -pthread) + AC_MSG_CHECKING([whether pthreads work with $ax_pthread_try_flag]) + PTHREAD_CFLAGS="$ax_pthread_try_flag" + + if test "x$GCC" = "xyes"; then + # Thanks to libtool bug #13550, we have to consider the possibility + # that -nostdlib will be used during compilation at some point. + # Try to determine the first pthread library available, + # ignoring any other variants. + for ax_pthread_try_lib_flag in $ax_pthread_flags; do + case $ax_pthread_try_lib_flag in + none|-*|pthread-config) + continue + ;; + + *) + PTHREAD_LIBS="-l$ax_pthread_try_lib_flag" + + ax_pthread_save_LIBS="$LIBS" + LIBS="$PTHREAD_LIBS $LIBS" + + # We only need to link a trivial program with + # the current library value. + # Linking should fail if the library doesn't + # exist, otherwise we should be good to go. + AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])], + [LIBS="$ax_pthread_save_LIBS" + break], + [LIBS="$ax_pthread_save_LIBS" + PTHREAD_LIBS=""]) + ;; + esac + done + fi + ;; + -*) AC_MSG_CHECKING([whether pthreads work with $ax_pthread_try_flag]) PTHREAD_CFLAGS="$ax_pthread_try_flag" @@ -438,7 +475,8 @@ if test "x$ax_pthread_ok" = "xyes"; then AC_CACHE_CHECK([for PTHREAD_PRIO_INHERIT], [ax_cv_PTHREAD_PRIO_INHERIT], [AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <pthread.h>]], - [[int i = PTHREAD_PRIO_INHERIT;]])], + [[int i = PTHREAD_PRIO_INHERIT; + return i;]])], [ax_cv_PTHREAD_PRIO_INHERIT=yes], [ax_cv_PTHREAD_PRIO_INHERIT=no]) ]) |