Autoconf generates C code that doesn't compile with -Wstrict-prototypes and -Werror

[Bradley Smith]

When using macros like AC_CHECK_LIB for example, the C code generated by
autoconf does not compile when -Wstrict-prototypes and -Werror are set in
the CFLAGS, and hence the test fails. (error: function declaration isn’t a
prototype) etc.

Here is a patch that fixes this problem.

diff -Naur autoconf/lib/autoconf/c.m4
autoconf.new/lib/autoconf/c.m4
--- autoconf/lib/autoconf/c.m4 2008-04-06 00:04:48.000000000 +0100
+++ autoconf.new/lib/autoconf/c.m4 2008-09-14 23:42:44.000000000 +0100
@@ -202,7 +202,7 @@
 m4_ifdef([_AC_LANG_PROGRAM_C_F77_HOOKS],
[_AC_LANG_PROGRAM_C_F77_HOOKS])[]dnl
 m4_ifdef([_AC_LANG_PROGRAM_C_FC_HOOKS],
[_AC_LANG_PROGRAM_C_FC_HOOKS])[]dnl
 int 
-main ()
+main (void)
 {
 dnl Do *not* indent the following line: there may be CPP directives.
 dnl Don't move the `;' right after for the same reason.
@@ -224,7 +224,7 @@
 #ifdef __cplusplus
 extern "C" 
 #endif
-char $2 ();])], [return $2 ();])])
+char $2 (void);])], [return $2 ();])])
 
 
 # AC_LANG_FUNC_LINK_TRY(C)(FUNCTION)
@@ -266,7 +266,7 @@
 #ifdef __cplusplus
 extern "C" 
 #endif
-char $1 ();
+char $1 (void);
 /* The GNU C library defines this for functions which it implements
     to always fail with ENOSYS.  Some functions are actually named
     something starting with __ and the normal name is an alias.  */

Regards,
Bradley Smith

-- 
Bradley Smith  <address@hidden>                  GPG: 0xC718D347

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