X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=m4%2Fattribute.m4;h=9d673e969603094e0a7e878561ad805269a98e8e;hp=58b8346723f1ba7bf7d25c02530da2579f703a4b;hb=d2f8d0920226e4d8edd3efa3c18b46b783aacea0;hpb=da3078c63a3b658573f6e2f986f69ed4d7993b3a

diff --git a/m4/attribute.m4 b/m4/attribute.m4
index 58b83467..9d673e96 100644
--- a/m4/attribute.m4
+++ b/m4/attribute.m4
@@ -1,7 +1,7 @@
 dnl Check to find out whether function attributes are supported.
 dnl If they are not, #define them to be nothing.
 
-AC_DEFUN(tinc_ATTRIBUTE,
+AC_DEFUN([tinc_ATTRIBUTE],
 [
   AC_CACHE_CHECK([for working $1 attribute], tinc_cv_attribute_$1,
   [ 
@@ -9,8 +9,8 @@ AC_DEFUN(tinc_ATTRIBUTE,
     CFLAGS="$CFLAGS -Wall -Werror"
     AC_COMPILE_IFELSE(
       [AC_LANG_SOURCE(
-        [void test(void) __attribute__ (($1));
-	 void test(void) { return; }
+        [void *test(void) __attribute__ (($1));
+	 void *test(void) { return (void *)0; }
 	],
        )],
        [tinc_cv_attribute_$1=yes],