m4: Fix compiler warnings

Makes it work with -Wall -W -Werror

diff --git a/m4/fd_passing.m4 b/m4/fd_passing.m4
index 79a44143c7362c8b396fb5dab86fbb73a4b1e8f7..6b96c0fb9474bf56aa670b6b692568b29312429e 100644 (file)
--- a/m4/fd_passing.m4
+++ b/m4/fd_passing.m4
@@ -17,13 +17,14 @@ AC_DEFUN([DOVECOT_FD_PASSING], [
         #include <fcntl.h>
         #include "fdpass.h"
         
+       static
         int nopen(void)
         {
              int i, n;
              struct stat sb;
              for (i = n = 0; i < 256; i++)
                  if (fstat(i, &sb) == 0) n++;
-             return n;
+              return n;
         }
         int main(void)
         {

diff --git a/m4/ipv6.m4 b/m4/ipv6.m4
index 4e6ab46d019f4eb6d4d369c97475b28d06efa896..02c400eb33cfab4b5a527f21b52c30c4645d535f 100644 (file)
--- a/m4/ipv6.m4
+++ b/m4/ipv6.m4
@@ -12,7 +12,7 @@ AC_DEFUN([DOVECOT_IPV6], [
   #include <netinet/in.h>
   #include <netdb.h>
   #include <arpa/inet.h>]],
-  [[struct in6_addr i;]])],
+  [[struct in6_addr i; (void)i;]])],
   [i_cv_type_in6_addr=yes],
   [i_cv_type_in6_addr=no])])
   if test $i_cv_type_in6_addr = yes; then

diff --git a/m4/unsetenv.m4 b/m4/unsetenv.m4
index 0c469e88097c9358f8187e4ade3704185c60c776..e02b57cf4b1cdff8778d459b7bae6b0f524eb398 100644 (file)
--- a/m4/unsetenv.m4
+++ b/m4/unsetenv.m4
@@ -3,7 +3,7 @@ AC_DEFUN([DOVECOT_UNSETENV_RET_INT], [
     AC_TRY_COMPILE([
       #include <stdlib.h>
     ], [
-      if (unsetenv("env") < 0) ;
+      if (unsetenv("env") < 0) { }
     ], [
       i_cv_unsetenv_ret_int=yes
     ], [