[Xen-devel] [PATCH 2 of 3] tools/m4: add AC_LANG_SOURCE to fix autoconf warnings

[Olaf Hering <olaf@xxxxxxxxx>]

# HG changeset patch
# User Olaf Hering <olaf@xxxxxxxxx>
# Date 1339593008 -7200
# Node ID 59762b446ab4e6d9a851a91d1457c11f6c828d49
# Parent  0dfe08c91739527eb454d5e4957635cb8b90e1e1
tools/m4: add AC_LANG_SOURCE to fix autoconf warnings

I see these warnings with autoconf 2.68, add AC_LANG_SOURCE as suggested
by upstream documentation.

...
 # bash autogen.sh
configure.ac:141: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in 
body
../../lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
../../lib/autoconf/general.m4:2662: _AC_LINK_IFELSE is expanded from...
../../lib/autoconf/general.m4:2679: AC_LINK_IFELSE is expanded from...
../../lib/m4sugar/m4sh.m4:606: AS_IF is expanded from...
../../lib/autoconf/general.m4:2032: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2053: AC_CACHE_CHECK is expanded from...
m4/pthread.m4:21: AX_CHECK_PTHREAD is expanded from...
configure.ac:141: the top level
configure.ac:142: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in 
body
../../lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
../../lib/autoconf/general.m4:2662: _AC_LINK_IFELSE is expanded from...
../../lib/autoconf/general.m4:2679: AC_LINK_IFELSE is expanded from...
../../lib/m4sugar/m4sh.m4:606: AS_IF is expanded from...
../../lib/autoconf/general.m4:2032: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2053: AC_CACHE_CHECK is expanded from...
m4/ptyfuncs.m4:1: AX_CHECK_PTYFUNCS is expanded from...
configure.ac:142: the top level
configure.ac:141: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in 
body
../../lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
../../lib/autoconf/general.m4:2662: _AC_LINK_IFELSE is expanded from...
../../lib/autoconf/general.m4:2679: AC_LINK_IFELSE is expanded from...
../../lib/m4sugar/m4sh.m4:606: AS_IF is expanded from...
../../lib/autoconf/general.m4:2032: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2053: AC_CACHE_CHECK is expanded from...
m4/pthread.m4:21: AX_CHECK_PTHREAD is expanded from...
configure.ac:141: the top level
configure.ac:142: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call detected in 
body
../../lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
../../lib/autoconf/general.m4:2662: _AC_LINK_IFELSE is expanded from...
../../lib/autoconf/general.m4:2679: AC_LINK_IFELSE is expanded from...
../../lib/m4sugar/m4sh.m4:606: AS_IF is expanded from...
../../lib/autoconf/general.m4:2032: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2053: AC_CACHE_CHECK is expanded from...
m4/ptyfuncs.m4:1: AX_CHECK_PTYFUNCS is expanded from...
configure.ac:142: the top level


Please rerun autoconf after applying this.

Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>

diff -r 0dfe08c91739 -r 59762b446ab4 tools/m4/pthread.m4
--- a/tools/m4/pthread.m4
+++ b/tools/m4/pthread.m4
@@ -24,13 +24,13 @@ AC_DEFUN([AX_CHECK_PTHREAD],[
         AX_PTHREAD_CV2VARS
         AX_PTHREAD_VARS([AX_SAVEVAR_SAVE])
         AX_PTHREAD_VARS([AX_PTHREAD_VAR_APPLY])
-        AC_LINK_IFELSE([
+        AC_LINK_IFELSE([AC_LANG_SOURCE([
 #include <pthread.h>
 int main(void) {
   pthread_atfork(0,0,0);
   pthread_create(0,0,0,0);
 }
-],[],[ax_cv_pthread_flags=failed])
+])],[],[ax_cv_pthread_flags=failed])
         AX_PTHREAD_VARS([AX_SAVEVAR_RESTORE])
     ])
     if test "x$ax_cv_pthread_flags" = xfailed; then
diff -r 0dfe08c91739 -r 59762b446ab4 tools/m4/ptyfuncs.m4
--- a/tools/m4/ptyfuncs.m4
+++ b/tools/m4/ptyfuncs.m4
@@ -9,7 +9,7 @@ AC_DEFUN([AX_CHECK_PTYFUNCS], [
             fi
             AX_SAVEVAR_SAVE(LIBS)
             LIBS="$LIBS $ax_cv_ptyfuncs_libs"
-            AC_LINK_IFELSE([
+            AC_LINK_IFELSE([AC_LANG_SOURCE([
 #ifdef INCLUDE_LIBUTIL_H
 #include INCLUDE_LIBUTIL_H
 #endif
@@ -17,7 +17,7 @@ int main(void) {
   openpty(0,0,0,0,0);
   login_tty(0);
 }
-],[
+])],[
                 break
             ],[])
             AX_SAVEVAR_RESTORE(LIBS)

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