[newlib-cygwin] Avoid cyclic header dependencies

[Corinna Vinschen <corinna@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=66e75b696133e889f514415a259d8d8d56f35d16

commit 66e75b696133e889f514415a259d8d8d56f35d16
Author: Sebastian Huber <sebastian.huber@embedded-brains.de>
Date:   Thu May 16 14:40:32 2019 +0200

    Avoid cyclic header dependencies
    
    RTEMS uses a considerable part of FreeBSD kernel and user space sources.
    These sources are compiled with a __FreeBSD__ define.  On 2018-06-26
    Gerald Pfeifer changed the GCC provided <stddef.h> so that it includes
    <sys/_types.h> if __FreeBSD__ is defined.  The Newlib <sys/_types.h>
    included <sys/lock.h> which includes <sys/cdefs.h> on RTEMS which
    includes <stddef.h>.  To get rid of this cyclic dependency move the
    optional _flock_t definition to <sys/reent.h>.
    
    Signed-off-by: Sebastian Huber <sebastian.huber@embedded-brains.de>

Diff:
---
 newlib/libc/include/sys/_types.h | 5 -----
 newlib/libc/include/sys/reent.h  | 5 +++++
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/newlib/libc/include/sys/_types.h b/newlib/libc/include/sys/_types.h
index fc10531..90383b0 100644
--- a/newlib/libc/include/sys/_types.h
+++ b/newlib/libc/include/sys/_types.h
@@ -22,7 +22,6 @@
 #include <newlib.h>
 #include <sys/config.h>
 #include <machine/_types.h>
-#include <sys/lock.h>
 
 #ifndef __machine_blkcnt_t_defined
 typedef long __blkcnt_t;
@@ -171,10 +170,6 @@ typedef struct
 } _mbstate_t;
 #endif
 
-#ifndef __machine_flock_t_defined
-typedef _LOCK_RECURSIVE_T _flock_t;
-#endif
-
 #ifndef __machine_iconv_t_defined
 /* Iconv descriptor type */
 typedef void *_iconv_t;
diff --git a/newlib/libc/include/sys/reent.h b/newlib/libc/include/sys/reent.h
index 6e55e1c..7f8124d 100644
--- a/newlib/libc/include/sys/reent.h
+++ b/newlib/libc/include/sys/reent.h
@@ -30,6 +30,11 @@ typedef unsigned __Long __ULong;
 #include <sys/types.h>
 #endif
 
+#ifndef __machine_flock_t_defined
+#include <sys/lock.h>
+typedef _LOCK_RECURSIVE_T _flock_t;
+#endif
+
 #ifndef __Long
 #define __Long __int32_t
 typedef __uint32_t __ULong;