configure.in: Avoid autoconf warning: Assume C89 semantics that

RETSIGTYPE is always void (issue #8510).

configure

 #! /bin/sh
-# From configure.in Revision: 80475 .
+# From configure.in Revision: 80478 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.65 for python 3.2.
 #
@@ -6417,39 +6417,11 @@ _ACEOF
 
 fi
 
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking return type of signal handlers" >&5
-$as_echo_n "checking return type of signal handlers... " >&6; }
-if test "${ac_cv_type_signal+set}" = set; then :
-  $as_echo_n "(cached) " >&6
-else
-  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-#include <sys/types.h>
-#include <signal.h>
-
-int
-main ()
-{
-return *(signal (0, 0)) (0) == 1;
-  ;
-  return 0;
-}
-_ACEOF
-if ac_fn_c_try_compile "$LINENO"; then :
-  ac_cv_type_signal=int
-else
-  ac_cv_type_signal=void
-fi
-rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_type_signal" >&5
-$as_echo "$ac_cv_type_signal" >&6; }
 
 cat >>confdefs.h <<_ACEOF
-#define RETSIGTYPE $ac_cv_type_signal
+#define RETSIGTYPE void
 _ACEOF
 
-
 ac_fn_c_check_type "$LINENO" "size_t" "ac_cv_type_size_t" "$ac_includes_default"
 if test "x$ac_cv_type_size_t" = x""yes; then :
 

configure.in

@@ -1374,18 +1374,7 @@ EOF
 AC_TYPE_MODE_T
 AC_TYPE_OFF_T
 AC_TYPE_PID_T
-AC_DIAGNOSE([obsolete],[your code may safely assume C89 semantics that RETSIGTYPE is void.
-Remove this warning and the `AC_CACHE_CHECK' when you adjust the code.])dnl
-AC_CACHE_CHECK([return type of signal handlers],[ac_cv_type_signal],[AC_COMPILE_IFELSE(
-[AC_LANG_PROGRAM([#include <sys/types.h>
-#include <signal.h>
-],
-		 [return *(signal (0, 0)) (0) == 1;])],
-		   [ac_cv_type_signal=int],
-		   [ac_cv_type_signal=void])])
-AC_DEFINE_UNQUOTED([RETSIGTYPE],[$ac_cv_type_signal],[Define as the return type of signal handlers
-		    (`int' or `void').])
-
+AC_DEFINE_UNQUOTED([RETSIGTYPE],[void],[assume C89 semantics that RETSIGTYPE is always void])
 AC_TYPE_SIZE_T
 AC_TYPE_UID_T
 AC_TYPE_UINT32_T

pyconfig.h.in

@@ -958,7 +958,7 @@
 /* Define as the size of the unicode type. */
 #undef Py_UNICODE_SIZE
 
-/* Define as the return type of signal handlers (`int' or `void'). */
+/* assume C89 semantics that RETSIGTYPE is always void */
 #undef RETSIGTYPE
 
 /* Define if setpgrp() must be called as setpgrp(0, 0). */