[newlib-cygwin] Remove __sglue member for one configuration

[Sebastian Huber <sh@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=0a862d13193616811ce897e2bd50ca3003b47f84

commit 0a862d13193616811ce897e2bd50ca3003b47f84
Author: Matt Joyce <matthew.joyce@embedded-brains.de>
Date:   Mon May 2 09:00:12 2022 +0200

    Remove __sglue member for one configuration
    
    Remove __sglue member of struct reent when _REENT_GLOBAL_STDIO_STREAMS is
    defined.

Diff:
---
 newlib/libc/include/sys/reent.h | 8 ++++----
 newlib/libc/reent/reent.c       | 4 ++++
 newlib/libc/stdio/fcloseall.c   | 5 +++++
 newlib/libc/stdio/findfp.c      | 9 ++++++++-
 4 files changed, 21 insertions(+), 5 deletions(-)

diff --git a/newlib/libc/include/sys/reent.h b/newlib/libc/include/sys/reent.h
index 44a671079..fa9ac57da 100644
--- a/newlib/libc/include/sys/reent.h
+++ b/newlib/libc/include/sys/reent.h
@@ -696,19 +696,19 @@ struct _reent
   /* These are here last so that __FILE can grow without changing the offsets
      of the above members (on the off chance that future binary compatibility
      would be broken otherwise).  */
-  struct _glue __sglue;		/* root of glue chain */
 # ifndef _REENT_GLOBAL_STDIO_STREAMS
+  struct _glue __sglue;		/* root of glue chain */
   __FILE __sf[3];  		/* first three file descriptors */
 # endif
 };
 
 #ifdef _REENT_GLOBAL_STDIO_STREAMS
 #define _REENT_STDIO_STREAM(var, index) &__sf[index]
-#define _REENT_INIT_SGLUE(_ptr) { _NULL, 0, _NULL }
+#define _REENT_INIT_SGLUE(_ptr) /* nothing to initialize */
 #define _REENT_INIT_SGLUE_ZEROED(_ptr) /* nothing to set */
 #else
 #define _REENT_STDIO_STREAM(var, index) &(var)->__sf[index]
-#define _REENT_INIT_SGLUE(_ptr) { _NULL, 3, &(_ptr)->__sf[0] }
+#define _REENT_INIT_SGLUE(_ptr) , { _NULL, 3, &(_ptr)->__sf[0] }
 #define _REENT_INIT_SGLUE_ZEROED(_ptr) \
   (_ptr)->__sglue._niobs = 3; \
   (_ptr)->__sglue._iobs = &(_ptr)->__sf[0];
@@ -758,7 +758,7 @@ struct _reent
       } \
     }, \
     _REENT_INIT_ATEXIT \
-    _NULL, \
+    _NULL \
     _REENT_INIT_SGLUE(&(var)) \
   }
 
diff --git a/newlib/libc/reent/reent.c b/newlib/libc/reent/reent.c
index 5a04fcf62..0bdd8aa62 100644
--- a/newlib/libc/reent/reent.c
+++ b/newlib/libc/reent/reent.c
@@ -27,6 +27,7 @@ int errno;
 
 #endif
 
+#ifndef _REENT_GLOBAL_STDIO_STREAMS
 /* Interim cleanup code */
 
 void
@@ -39,6 +40,7 @@ cleanup_glue (struct _reent *ptr,
 
   _free_r (ptr, glue);
 }
+#endif
 
 void
 _reclaim_reent (struct _reent *ptr)
@@ -124,8 +126,10 @@ _reclaim_reent (struct _reent *ptr)
 	     before the program exits, and who wants to wait for that? */
 	  ptr->__cleanup (ptr);
 
+#ifndef _REENT_GLOBAL_STDIO_STREAMS
 	  if (ptr->__sglue._next)
 	    cleanup_glue (ptr, ptr->__sglue._next);
+#endif
 	}
 
       /* Malloc memory not reclaimed; no good way to return memory anyway. */
diff --git a/newlib/libc/stdio/fcloseall.c b/newlib/libc/stdio/fcloseall.c
index f14c28d34..642dc7d94 100644
--- a/newlib/libc/stdio/fcloseall.c
+++ b/newlib/libc/stdio/fcloseall.c
@@ -59,7 +59,12 @@ Required OS subroutines: <<close>>, <<fstat>>, <<isatty>>, <<lseek>>,
 int
 _fcloseall_r (struct _reent *ptr)
 {
+#ifdef _REENT_GLOBAL_STDIO_STREAMS
+  /* There are no thread-specific FILE objects */
+  return 0;
+#else
   return _fwalk_sglue (ptr, _fclose_r, &ptr->__sglue);
+#endif
 }
 
 #ifndef _REENT_ONLY
diff --git a/newlib/libc/stdio/findfp.c b/newlib/libc/stdio/findfp.c
index 29c068a12..19952d4e0 100644
--- a/newlib/libc/stdio/findfp.c
+++ b/newlib/libc/stdio/findfp.c
@@ -242,8 +242,9 @@ cleanup_stdio (struct _reent *ptr)
     CLEANUP_FILE (ptr, ptr->_stdout);
   if (ptr->_stderr != &__sf[2])
     CLEANUP_FILE (ptr, ptr->_stderr);
-#endif
+#else
   (void) _fwalk_sglue (ptr, CLEANUP_FILE, &ptr->__sglue);
+#endif
 }
 
 /*
@@ -326,21 +327,27 @@ __fp_unlock (struct _reent * ptr __unused, FILE * fp)
 void
 __fp_lock_all (void)
 {
+#ifndef _REENT_GLOBAL_STDIO_STREAMS
   struct _reent *ptr;
+#endif
 
   __sfp_lock_acquire ();
 
+#ifndef _REENT_GLOBAL_STDIO_STREAMS
   ptr = _REENT;
   (void) _fwalk_sglue (ptr, __fp_lock, &ptr->__sglue);
+#endif
 }
 
 void
 __fp_unlock_all (void)
 {
+#ifndef _REENT_GLOBAL_STDIO_STREAMS
   struct _reent *ptr;
 
   ptr = _REENT;
   (void) _fwalk_sglue (ptr, __fp_unlock, &ptr->__sglue);
+#endif
 
   __sfp_lock_release ();
 }