[newlib-cygwin/main] getlocalename_l: fix _reent for _REENT_SMALL targets

[Corinna Vinschen <corinna@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=bfb68a9e6e43bb6a7fbbaca3e1e18f6244eab6a3

commit bfb68a9e6e43bb6a7fbbaca3e1e18f6244eab6a3
Author:     Corinna Vinschen <corinna@vinschen.de>
AuthorDate: Mon Feb 5 10:38:28 2024 +0100
Commit:     Corinna Vinschen <corinna@vinschen.de>
CommitDate: Mon Feb 5 10:38:28 2024 +0100

    getlocalename_l: fix _reent for _REENT_SMALL targets
    
    The new _MB_CAPABALE-only _misc_reent member getlocalename_l_buf was
    incorrectly initialized in the _REENT_INIT_MISC macro, so the build
    failed for _REENT_SMALL targets, independet of the _MB_CAPABALE setting.
    
    Fixes: 71511d4ac868 ("getlocalename_l: implement per SUS Base Specifications Issue 8 draft")
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 newlib/libc/include/sys/reent.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/newlib/libc/include/sys/reent.h b/newlib/libc/include/sys/reent.h
index 4e60c3096ae2..0cba1667cc66 100644
--- a/newlib/libc/include/sys/reent.h
+++ b/newlib/libc/include/sys/reent.h
@@ -514,6 +514,11 @@ struct _reent
 #define _REENT_CHECK_EMERGENCY(var) \
   _REENT_CHECK(var, _emergency, char *, _REENT_EMERGENCY_SIZE, /* nothing */)
 
+#ifdef _MB_CAPABLE
+#define __REENT_INIT_MISC_GETLOCALENAME_L _r->_misc->_getlocalename_l_buf[0] = '\0'
+#else
+#define __REENT_INIT_MISC_GETLOCALENAME_L
+#endif
 #define _REENT_INIT_MISC(var) do { \
   struct _reent *_r = (var); \
   _r->_misc->_strtok_last = _NULL; \
@@ -533,7 +538,7 @@ struct _reent
   _r->_misc->_wcrtomb_state.__value.__wch = 0; \
   _r->_misc->_wcsrtombs_state.__count = 0; \
   _r->_misc->_wcsrtombs_state.__value.__wch = 0; \
-  _r->_misc->_getlocale_l_buf[0] = '\0'; \
+  __REENT_INIT_MISC_GETLOCALENAME_L; \
   _r->_misc->_l64a_buf[0] = '\0'; \
   _r->_misc->_getdate_err = 0; \
 } while (0)