Unbreak the MinGW64 build

* nt/inc/ms-w32.h [MINGW_W64]: Undefine HAVE_GAI_STRERROR.  See
http://lists.gnu.org/archive/html/emacs-devel/2016-03/msg00130.html
for the details.  Reported by Angelo Graziosi
<angelo.graziosi@alice.it>.

diff --git a/nt/inc/ms-w32.h b/nt/inc/ms-w32.h
index a37510e7457f8d3564665355bbd64f5cd8f130b0..9de3b12a808db4408dfa9b8326dbbc71eccc746b 100644 (file)
--- a/nt/inc/ms-w32.h
+++ b/nt/inc/ms-w32.h
@@ -185,6 +185,13 @@ extern struct tm * sys_localtime (const time_t *);
    supply the 2nd arg correctly, so don't use _setjmp directly in that
    case.  */
 #undef HAVE__SETJMP
+
+/* Unlike MS and mingw.org, MinGW64 doesn't define gai_strerror as an
+   inline function in a system header file, and instead seems to
+   require to link against ws2_32.a.  But we don't want to link with
+   -lws2_32, as that would make Emacs dependent on the respective DLL.
+   So MinGW64 is amply punished here by the following:  */
+#undef HAVE_GAI_STRERROR
 #endif
 
 /* The following is needed for recovery from C stack overflows.  */