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Easy fix, cast AT_FDCWD to (int):
% hg diff
diff -r 3a880d640981 Modules/posixmodule.c
--- a/Modules/posixmodule.c Tue Sep 18 07:21:18 2012 +0300
+++ b/Modules/posixmodule.c Tue Sep 18 16:04:58 2012 +0000
@@ -414,7 +414,14 @@
 
 
 #ifdef AT_FDCWD
-#define DEFAULT_DIR_FD AT_FDCWD
+/*
+ * Why the (int) cast? Solaris 10 defines AT_FDCWD as 0xffd19553 (-3041965);
+ * without the int cast, the value gets interpreted as uint (4291925331),
+ * which doesn't play nicely with all the initializer lines in this file that
+ * look like this:
+ * int dir_fd = DEFAULT_DIR_FD;
+ */
+#define DEFAULT_DIR_FD (int)AT_FDCWD
 #else
 #define DEFAULT_DIR_FD (-100)
 #endif
The cast is harmless on other platforms that use an actual integer (rather than a hex representation).
Any objections?