Merge r1917642 from trunk:

* build/apr_threads.m4, build/apr_common.m4, configure.in: Use full
  prototype for main() throughout, avoiding warnings when building
  with gcc -Wstrict-prototypes.




git-svn-id: https://svn.apache.org/repos/asf/apr/apr/branches/1.7.x@1920069 13f79535-47bb-0310-9956-ffa450edef68

build/apr_common.m4

@@ -920,7 +920,7 @@ else
 dnl <sys/types.h> should be available everywhere!
   cat > conftest.c <<EOF
 #include <sys/types.h>
-  int main() { return 0; }
+  int main(int argc, const char *argv[]) { return 0; }
 EOF
   MKDEP="true"
   for i in "$CC -MM" "$CC -M" "$CPP -MM" "$CPP -M" "cpp -M"; do

build/apr_threads.m4

@@ -100,7 +100,7 @@ void *thread_routine(void *data) {
     return data;
 }
 
-int main() {
+int main(int argc, const char *argv[]) {
     pthread_t thd;
     pthread_mutexattr_t mattr;
     pthread_once_t once_init = PTHREAD_ONCE_INIT;
@@ -228,7 +228,7 @@ AC_DEFUN([APR_CHECK_PTHREAD_RECURSIVE_MUTEX], [
 #include <pthread.h>
 #include <stdlib.h>
 
-int main() {
+int main(int argc, const char *argv[]) {
     pthread_mutexattr_t attr;
     pthread_mutex_t m;
 

configure.in

@@ -1144,7 +1144,7 @@ AC_CACHE_CHECK([for dup3 support], [apr_cv_dup3],
 [AC_TRY_RUN([
 #include <unistd.h>
 
-int main()
+int main(int argc, const char *argv[])
 {
     return dup3(STDOUT_FILENO, STDERR_FILENO, 0) == -1;
 }], [apr_cv_dup3=yes], [apr_cv_dup3=no], [apr_cv_dup3=no])])
@@ -1205,7 +1205,7 @@ AC_CACHE_CHECK([for SOCK_CLOEXEC support], [apr_cv_sock_cloexec],
 #include <sys/types.h>
 #include <sys/socket.h>
 
-int main()
+int main(int argc, const char *argv[])
 {
     return socket(AF_INET, SOCK_STREAM|SOCK_CLOEXEC, 0) == -1;
 }], [apr_cv_sock_cloexec=yes], [apr_cv_sock_cloexec=no], [apr_cv_sock_cloexec=no])])
@@ -1402,7 +1402,7 @@ if test "$ac_cv_func_mmap" = "yes" &&
 #ifdef HAVE_SYS_MMAN_H
 #include <sys/mman.h>
 #endif
-    int main()
+    int main(int argc, const char *argv[])
     {
         int fd;
         void *m;
@@ -2473,7 +2473,7 @@ AC_TRY_RUN([
 #ifndef SEM_FAILED
 #define SEM_FAILED (-1)
 #endif
-int main()
+int main(int argc, const char *argv[])
 {
     sem_t *psem;
     const char *sem_name = "/apr_autoconf";
@@ -2534,7 +2534,7 @@ if test "$threads" = "1"; then
 #include <sys/types.h>
 #include <pthread.h>
 #include <stdlib.h>
-        int main()
+        int main(int argc, const char *argv[])
         {
             pthread_mutex_t mutex;
             pthread_mutexattr_t attr;
@@ -2672,7 +2672,7 @@ const char *fname = "conftest.fcntl";
 
 int lockit();
 
-int main()
+int main(int argc, const char *argv[])
 {
     int rc, status;;
     proc_mutex_lock_it.l_whence = SEEK_SET;   /* from current point */