This fixes the bootstrap failure with Ada on Cygwin since the switch
to C++11. The configure checks detect that fileno_unlocked () is
present, but when Ada's cstreams.c is compiled in C++11 mode,
<stdio.h> does not declare it, causing a hard error.
Fixed by defining _GNU_SOURCE before including <stdio.h>.
Ok for the master branch?
gcc/ada/
2021-02-03 Mikael Pettersson <mikpeli...@gmail.com>
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 4e00dedbbd6..9d2f41c5269 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() to work around
PR98590 */
+#if defined(__CYGWIN__) && !defined(__CYGWIN32__) && !defined(_GNU_SOURCE)
+#define _GNU_SOURCE
+#endif
+
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
From 7a277d8c2a6c1d4ccfbb0ca350e4b1f35a3e575c Mon Sep 17 00:00:00 2001
From: Mikael Pettersson <mikpeli...@gmail.com>
Date: Wed, 3 Feb 2021 17:25:42 +0100
Subject: [PATCH] Ensure fileno_unlocked() is visible on Cygwin.
---
gcc/ada/cstreams.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/gcc/ada/cstreams.c b/gcc/ada/cstreams.c
index 4e00dedbbd6..9d2f41c5269 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() to work around PR98590 */
+#if defined(__CYGWIN__) && !defined(__CYGWIN32__) && !defined(_GNU_SOURCE)
+#define _GNU_SOURCE
+#endif
+
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
--
2.26.2
