Check if pthread and nanosleep() are in libc before linking other libs

In recent versions of glibc this is true and prevents linking with
pthreads when it is not necessary.

Tweaked by Stef Walter

Signed-off-by: Stef Walter <stef@thewalter.net>

diff --git a/configure.ac b/configure.ac
index 91bb856065a2937c721ac93195be1098414a9168..b9b538aa0d554b49ba50b2ef5d70a9cc0c60da80 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -68,12 +68,21 @@ AC_C_BIGENDIAN
 AC_HEADER_STDBOOL
 
 if test "$os_unix" = "yes"; then
-       AC_CHECK_LIB(pthread, pthread_mutex_lock,,
-               [AC_MSG_ERROR([could not find pthread_mutex_lock])])
-       AC_SEARCH_LIBS([dlopen], [dl dld], [],
-               [AC_MSG_ERROR([could not find dlopen])])
-       AC_SEARCH_LIBS([nanosleep], [rt], [],
-               [AC_MSG_ERROR([could not find nanosleep])])
+       AC_CHECK_FUNC([pthread_mutexattr_init], , [
+               AC_CHECK_LIB(pthread, pthread_mutexattr_init, , [
+                       AC_MSG_ERROR([could not find pthread_mutexattr_init])
+               ])
+       ])
+
+       AC_CHECK_FUNC([nanosleep], , [
+               AC_SEARCH_LIBS([nanosleep], [rt], , [
+                       AC_MSG_ERROR([could not find nanosleep])
+               ])
+       ])
+
+       AC_SEARCH_LIBS([dlopen], [dl dld], [], [
+               AC_MSG_ERROR([could not find dlopen])
+       ])
 
        # These are thngs we can work around
        AC_CHECK_FUNCS([getprogname getexecname basename mkstemp mkdtemp])