AC_PROG_CXX_EXIT_DECLARATION

[Jens Petersen]

Th little patch below improves AC_PROG_CXX_EXIT_DECLARATION
so that it only adds the prototype declaration to
"confdefs.h" when it is non-empty (the first (commonest?) 
case).  I lightly tested it on gnomemm.

Jens


2001-06-26  Jens Petersen  <address@hidden>

        * aclang.m4 (_AC_PROG_CXX_EXIT_DECLARATION): Only add declaration to
        confdefs.h when non-zero.


Index: aclang.m4
===================================================================
RCS file: /cvsroot/autoconf/autoconf/aclang.m4,v
retrieving revision 1.137
diff -u -r1.137 aclang.m4
--- aclang.m4   2001/06/25 06:14:43     1.137
+++ aclang.m4   2001/06/26 07:51:46
@@ -1221,9 +1221,11 @@
                                       [exit (42);])],
                      [break])
 done
-echo '#ifdef __cplusplus' >>confdefs.h
-echo $ac_declaration      >>confdefs.h
-echo '#endif'             >>confdefs.h
+if test -n "$ac_declaration"; then
+  echo '#ifdef __cplusplus' >>confdefs.h
+  echo $ac_declaration      >>confdefs.h
+  echo '#endif'             >>confdefs.h
+fi
 ])# _AC_PROG_CXX_EXIT_DECLARATION