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From: "Jun T." <takimoto-j@kba.biglobe.ne.jp>
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Subject: [PATCH} define _GNU_SOURCE on Cygwin
Message-Id: <9E7FD5B2-061D-4ABE-84A8-A54C844E34BE@kba.biglobe.ne.jp>
Date: Wed, 26 Oct 2016 19:04:08 +0900
To: "zsh-workers@zsh.org" <zsh-workers@zsh.org>
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Cygwin now started to require _XOPEN_SOURCE also for
wcwidth() (in addition to strptime(); cf. worker/38862).

Since wcwidth() is used in may files, I think it would be
better to define _GNU_SOURCE in zsh_system.h.

(defining _XOPEN_SOURCE alone hides may other function)


diff --git a/Src/Modules/datetime.c b/Src/Modules/datetime.c
index b924392..bb82c54 100644
--- a/Src/Modules/datetime.c
+++ b/Src/Modules/datetime.c
@@ -27,9 +27,6 @@
  *
  */
=20
-#ifdef __CYGWIN__
-#define _XOPEN_SOURCE
-#endif
 #include "datetime.mdh"
 #include "datetime.pro"
 #include <time.h>
diff --git a/Src/zsh_system.h b/Src/zsh_system.h
index a9cbf02..5339b49 100644
--- a/Src/zsh_system.h
+++ b/Src/zsh_system.h
@@ -37,7 +37,7 @@
 #endif
 #endif
=20
-#if defined(__linux) || defined(__GNU__) || defined(__GLIBC__) || =
defined(LIBC_MUSL)
+#if defined(__linux) || defined(__GNU__) || defined(__GLIBC__) || =
defined(LIBC_MUSL) || defined(__CYGWIN__)
 /*
  * Turn on numerous extensions.
  * This is in order to get the functions for manipulating /dev/ptmx.