Define _XOPEN_SOURCE and _GNU_SOURCE in pyconfig.h, to have them

available in the configure tests already.

Include/Python.h

@@ -2,17 +2,6 @@
 #define Py_PYTHON_H
 /* Since this is a "meta-include" file, no #ifdef __cplusplus / extern "C" { */
 
-
-/* Enable compiler features; switching on C lib defines doesn't work
-   here, because the symbols haven't necessarily been defined yet. */
-#ifndef _GNU_SOURCE
-# define _GNU_SOURCE	1
-#endif
-
-#ifndef _XOPEN_SOURCE
-# define _XOPEN_SOURCE 500
-#endif
-
 /* Include nearly all Python header files */
 
 #include "patchlevel.h"

configure

@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.in Revision: 1.333 .
+# From configure.in Revision: 1.334 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.53.
 #
@@ -1225,6 +1225,23 @@ VERSION=2.3
 
 SOVERSION=1.0
 
+# The later defininition of _XOPEN_SOURCE disables certain features
+# on Linux, so we need _GNU_SOURCE to re-enable them (makedev, tm_zone).
+
+cat >>confdefs.h <<\_ACEOF
+#define _GNU_SOURCE 1
+_ACEOF
+
+
+# The definition of _GNU_SOURCE potentially causes a change of the value
+# of _XOPEN_SOURCE. So define it only conditionally.
+
+
+cat >>confdefs.h <<\_ACEOF
+#define _XOPEN_SOURCE 500
+_ACEOF
+
+
 # Arguments passed to configure.
 
 CONFIG_ARGS="$ac_configure_args"

configure.in

@@ -20,6 +20,19 @@ VERSION=2.3
 AC_SUBST(SOVERSION)
 SOVERSION=1.0
 
+# The later defininition of _XOPEN_SOURCE disables certain features
+# on Linux, so we need _GNU_SOURCE to re-enable them (makedev, tm_zone).
+AC_DEFINE(_GNU_SOURCE, 1, [Define on Linux to activate all library features])
+
+# The definition of _GNU_SOURCE potentially causes a change of the value
+# of _XOPEN_SOURCE. So define it only conditionally.
+AH_VERBATIM([_XOPEN_SOURCE],
+[/* Define on UNIX to activate XPG/5 features.  */
+#ifndef _XOPEN_SOURCE
+# define _XOPEN_SOURCE 500
+#endif])
+AC_DEFINE(_XOPEN_SOURCE, 500)
+
 # Arguments passed to configure.
 AC_SUBST(CONFIG_ARGS)
 CONFIG_ARGS="$ac_configure_args"

pyconfig.h.in

@@ -754,6 +754,9 @@
 /* This must be set to 64 on some systems to enable large file support. */
 #undef _FILE_OFFSET_BITS
 
+/* Define on Linux to activate all library features */
+#undef _GNU_SOURCE
+
 /* This must be defined on some systems to enable large file support. */
 #undef _LARGEFILE_SOURCE
 
@@ -773,6 +776,11 @@
 /* Define to force use of thread-safe errno, h_errno, and other functions */
 #undef _REENTRANT
 
+/* Define on UNIX to activate XPG/5 features.  */
+#ifndef _XOPEN_SOURCE
+# define _XOPEN_SOURCE 500
+#endif
+
 /* Define to 1 if type `char' is unsigned and you are not using gcc.  */
 #ifndef __CHAR_UNSIGNED__
 # undef __CHAR_UNSIGNED__