From: Mikael Pettersson <mikpelinux@gmail.com>
Date: Tue, 2 Mar 2021 22:20:06 +0000 (-0700)
Subject: [PATCH] Fix Ada bootstrap failure on Cygwin since switch to C++11 (PR98590)
X-Git-Tag: basepoints/gcc-12~793
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=8b6ebc025cf2b25fdc1e8f6e6261701dc71bac74;p=thirdparty%2Fgcc.git

[PATCH] Fix Ada bootstrap failure on Cygwin since switch to C++11 (PR98590)

gcc/ada
	PR bootstrap/98590
	* cstreams.c: Ensure fileno_unlocked() is visible on Cygwin.
---

diff --git a/gcc/ada/cstreams.c b/gcc/ada/cstreams.c
index 4e00dedbbd68..8072320ae10c 100644
--- a/gcc/ada/cstreams.c
+++ b/gcc/ada/cstreams.c
@@ -37,6 +37,11 @@
 #define _FILE_OFFSET_BITS 64
 /* the define above will make off_t a 64bit type on GNU/Linux */
 
+/* Tell Cygwin's <stdio.h> to expose fileno_unlocked() */
+#if defined(__CYGWIN__) && !defined(__CYGWIN32__) && !defined(_GNU_SOURCE)
+#define _GNU_SOURCE
+#endif
+
 #include <stdio.h>
 #include <sys/types.h>
 #include <sys/stat.h>