[newlib-cygwin] Add _REENT_STDERR(ptr)

[Sebastian Huber <sh@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=e56801f34d798eafa054b383de5bf2df986576cc

commit e56801f34d798eafa054b383de5bf2df986576cc
Author: Matt Joyce <matthew.joyce@embedded-brains.de>
Date:   Tue Feb 1 13:05:53 2022 +0100

    Add _REENT_STDERR(ptr)
    
    Add a _REENT_STDERR() macro to encapsulate access to the _stderr
    member of struct reent. This will help to replace the struct
    member with a thread-local storage object in a follow up patch.

Diff:
---
 newlib/libc/include/stdio.h     | 4 ++--
 newlib/libc/include/sys/reent.h | 1 +
 newlib/libc/machine/spu/stdio.c | 4 ++--
 newlib/libc/stdio/findfp.c      | 4 ++--
 4 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/newlib/libc/include/stdio.h b/newlib/libc/include/stdio.h
index 95cc55fa9..c75e48125 100644
--- a/newlib/libc/include/stdio.h
+++ b/newlib/libc/include/stdio.h
@@ -169,11 +169,11 @@ typedef _ssize_t ssize_t;
 
 #define	stdin	_REENT_STDIN(_REENT)
 #define	stdout	_REENT_STDOUT(_REENT)
-#define	stderr	(_REENT->_stderr)
+#define	stderr	_REENT_STDERR(_REENT)
 
 #define _stdin_r(x)	_REENT_STDIN(x)
 #define _stdout_r(x)	_REENT_STDOUT(x)
-#define _stderr_r(x)	((x)->_stderr)
+#define _stderr_r(x)	_REENT_STDERR(x)
 
 /*
  * Functions defined in ANSI C standard.
diff --git a/newlib/libc/include/sys/reent.h b/newlib/libc/include/sys/reent.h
index 652a330cb..c0647cfd9 100644
--- a/newlib/libc/include/sys/reent.h
+++ b/newlib/libc/include/sys/reent.h
@@ -722,6 +722,7 @@ struct _reent
 #define _REENT_ERRNO(_ptr)	((_ptr)->_errno)
 #define _REENT_STDIN(_ptr)	((_ptr)->_stdin)
 #define _REENT_STDOUT(_ptr)	((_ptr)->_stdout)
+#define _REENT_STDERR(_ptr)	((_ptr)->_stderr)
 
 #define _REENT_INIT_PTR(var) \
   { memset((var), 0, sizeof(*(var))); \
diff --git a/newlib/libc/machine/spu/stdio.c b/newlib/libc/machine/spu/stdio.c
index 769b8f1c9..83a60c06b 100644
--- a/newlib/libc/machine/spu/stdio.c
+++ b/newlib/libc/machine/spu/stdio.c
@@ -73,8 +73,8 @@ __sinit (struct _reent *s)
   _REENT_STDOUT(s) = &s->__sf[1];
   _REENT_STDOUT(s)->_fp = SPE_STDOUT;
 
-  s->_stderr = &s->__sf[2];
-  s->_stderr->_fp = SPE_STDERR;
+  _REENT_STDERR(s) = &s->__sf[2];
+  _REENT_STDERR(s)->_fp = SPE_STDERR;
 }
 
 void
diff --git a/newlib/libc/stdio/findfp.c b/newlib/libc/stdio/findfp.c
index 04e3517a7..3c888d03c 100644
--- a/newlib/libc/stdio/findfp.c
+++ b/newlib/libc/stdio/findfp.c
@@ -222,8 +222,8 @@ cleanup_stdio (struct _reent *ptr)
     CLEANUP_FILE (ptr, _REENT_STDIN(ptr));
   if (_REENT_STDOUT(ptr) != &__sf[1])
     CLEANUP_FILE (ptr, _REENT_STDOUT(ptr));
-  if (ptr->_stderr != &__sf[2])
-    CLEANUP_FILE (ptr, ptr->_stderr);
+  if (_REENT_STDERR(ptr) != &__sf[2])
+    CLEANUP_FILE (ptr, _REENT_STDERR(ptr));
 }
 
 /*