[newlib-cygwin] Provide __size_t via <sys/_types.h>

[Corinna Vinschen <corinna@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=3ad9b2fcbab86ad58224c91619782fab2f17f126

commit 3ad9b2fcbab86ad58224c91619782fab2f17f126
Author: Sebastian Huber <sebastian.huber@embedded-brains.de>
Date:   Fri Apr 15 13:44:28 2016 +0200

    Provide __size_t via <sys/_types.h>
    
    Various FreeBSD source and header files need a typedef __size_t via
    <sys/_types.h>.  Unfortunately the GCC provided <stddef.h> uses
    
    	#if (defined (__FreeBSD__) && (__FreeBSD__ >= 5)) \
    	  || defined(__DragonFly__) \
    	  || defined(__FreeBSD_kernel__)
    	/* __size_t is a typedef on FreeBSD 5, must not trash it. */
    	#elif defined (__VMS__)
    	/* __size_t is also a typedef on VMS.  */
    	#else
    	#define __size_t
    	#endif
    
    and therefore defines __size_t on Newlib targets which would trash a
    __size_t typedef.  Include <stddef.h> before <sys/_types.h> in
    <sys/types.h> and undefine __size_t in <sys/_types.h> as a workaround.
    
    Signed-off-by: Sebastian Huber <sebastian.huber@embedded-brains.de>

Diff:
---
 newlib/libc/include/sys/_types.h | 15 +++++++++++++++
 newlib/libc/include/sys/types.h  |  4 ++--
 2 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/newlib/libc/include/sys/_types.h b/newlib/libc/include/sys/_types.h
index 6a2c94d..06ddd83 100644
--- a/newlib/libc/include/sys/_types.h
+++ b/newlib/libc/include/sys/_types.h
@@ -119,6 +119,21 @@ typedef _off64_t _fpos64_t;
 #endif
 #endif
 
+/* Defined by GCC provided <stddef.h> */
+#undef __size_t
+
+#ifndef __machine_size_t_defined
+#ifdef __SIZE_TYPE__
+typedef __SIZE_TYPE__ __size_t;
+#else
+#if defined(__INT_MAX__) && __INT_MAX__ == 2147483647
+typedef int __size_t;
+#else
+typedef long __size_t;
+#endif
+#endif
+#endif
+
 #ifndef __machine_ssize_t_defined
 #ifdef __SIZE_TYPE__
 /* If __SIZE_TYPE__ is defined (gcc) we define ssize_t based on size_t.
diff --git a/newlib/libc/include/sys/types.h b/newlib/libc/include/sys/types.h
index 57b74ef..31f765e 100644
--- a/newlib/libc/include/sys/types.h
+++ b/newlib/libc/include/sys/types.h
@@ -56,11 +56,11 @@ typedef	quad_t *	qaddr_t;
 #ifndef __need_inttypes
 
 #define _SYS_TYPES_H
+/* <stddef.h> must be before <sys/_types.h> for __size_t considerations */
+#include <stddef.h>
 #include <sys/_types.h>
 #include <sys/_stdint.h>
 
-# include <stddef.h>
-
 #if __BSD_VISIBLE
 #include <machine/endian.h>
 #include <sys/select.h>