Issue #13057: Include stdio.h when NULL is used in configure.ac.
diff --git a/configure.ac b/configure.ac
index 819bb60..862d694 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1345,6 +1345,7 @@
AC_MSG_CHECKING(whether pthreads are available without options)
AC_CACHE_VAL(ac_cv_pthread_is_default,
[AC_RUN_IFELSE([AC_LANG_SOURCE([[
+#include <stdio.h>
#include <pthread.h>
void* routine(void* p){return NULL;}
@@ -1379,6 +1380,7 @@
[ac_save_cc="$CC"
CC="$CC -Kpthread"
AC_RUN_IFELSE([AC_LANG_SOURCE([[
+#include <stdio.h>
#include <pthread.h>
void* routine(void* p){return NULL;}
@@ -1407,6 +1409,7 @@
[ac_save_cc="$CC"
CC="$CC -Kthread"
AC_RUN_IFELSE([AC_LANG_SOURCE([[
+#include <stdio.h>
#include <pthread.h>
void* routine(void* p){return NULL;}
@@ -1435,6 +1438,7 @@
[ac_save_cc="$CC"
CC="$CC -pthread"
AC_RUN_IFELSE([AC_LANG_SOURCE([[
+#include <stdio.h>
#include <pthread.h>
void* routine(void* p){return NULL;}
@@ -2356,7 +2360,9 @@
_libs=$LIBS
LIBS="$LIBS -lpthread"
AC_MSG_CHECKING([for pthread_create in -lpthread])
- AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <pthread.h>
+ AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+#include <stdio.h>
+#include <pthread.h>
void * start_routine (void *arg) { exit (0); }]], [[
pthread_create (NULL, NULL, start_routine, NULL)]])],[
@@ -2422,7 +2428,9 @@
AC_MSG_CHECKING(if PTHREAD_SCOPE_SYSTEM is supported)
AC_CACHE_VAL(ac_cv_pthread_system_supported,
- [AC_RUN_IFELSE([AC_LANG_SOURCE([[#include <pthread.h>
+ [AC_RUN_IFELSE([AC_LANG_SOURCE([[
+ #include <stdio.h>
+ #include <pthread.h>
void *foo(void *parm) {
return NULL;
}