[newlib-cygwin] Add two __sglue initialization macros

[Sebastian Huber <sh@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=e5e36867f851b7355e6221a598f604bcae52597f

commit e5e36867f851b7355e6221a598f604bcae52597f
Author: Matt Joyce <matthew.joyce@embedded-brains.de>
Date:   Tue Apr 5 11:40:19 2022 +0200

    Add two __sglue initialization macros
    
    Added _REENT_INIT_SGLUE and _REENT_INIT_SGLUE_ZEROED macros
    to initialize __sglue member of struct _reent. This allows
    further simplification of __sinit() and facilitates the removal
    of __sglue as a member of struct _reent for certain configurations
    in a follow-on patch.

Diff:
---
 newlib/libc/include/sys/reent.h | 9 ++++++++-
 newlib/libc/stdio/findfp.c      | 7 +------
 2 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/newlib/libc/include/sys/reent.h b/newlib/libc/include/sys/reent.h
index e0b0ccffb..4b0d68610 100644
--- a/newlib/libc/include/sys/reent.h
+++ b/newlib/libc/include/sys/reent.h
@@ -702,8 +702,14 @@ struct _reent
 
 #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_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_ZEROED(_ptr) \
+  (_ptr)->__sglue._niobs = 3; \
+  (_ptr)->__sglue._iobs = &(_ptr)->__sf[0];
 #endif
 
 #define _REENT_INIT(var) \
@@ -751,7 +757,7 @@ struct _reent
     }, \
     _REENT_INIT_ATEXIT \
     _NULL, \
-    {_NULL, 0, _NULL} \
+    _REENT_INIT_SGLUE(&(var)) \
   }
 
 #define _REENT_INIT_PTR_ZEROED(var) \
@@ -766,6 +772,7 @@ struct _reent
     (var)->_new._reent._r48._mult[1] = _RAND48_MULT_1; \
     (var)->_new._reent._r48._mult[2] = _RAND48_MULT_2; \
     (var)->_new._reent._r48._add = _RAND48_ADD; \
+    _REENT_INIT_SGLUE_ZEROED(var) \
   }
 
 #define _REENT_CHECK_RAND48(ptr)	/* nothing */
diff --git a/newlib/libc/stdio/findfp.c b/newlib/libc/stdio/findfp.c
index 8327b1992..66867e664 100644
--- a/newlib/libc/stdio/findfp.c
+++ b/newlib/libc/stdio/findfp.c
@@ -246,12 +246,7 @@ __sinit (struct _reent *s)
   /* make sure we clean up on exit */
   s->__cleanup = cleanup_stdio;	/* conservative */
 
-#ifndef _REENT_SMALL
-# ifndef _REENT_GLOBAL_STDIO_STREAMS
-  s->__sglue._niobs = 3;
-  s->__sglue._iobs = &s->__sf[0];
-# endif /* _REENT_GLOBAL_STDIO_STREAMS */
-#else
+#ifdef _REENT_SMALL
 # ifndef _REENT_GLOBAL_STDIO_STREAMS
   s->_stdin = __sfp(s);
   s->_stdout = __sfp(s);