Define the newlib version macros in one place: _newlib_version.h.

Currently, the newlib version information needs to be updated in two places:
 - newlib/acinclude.m4
 - newlib/libc/include/sys/features.h

The goal of this patch is to:
 - supply a single location for defining the newlib version
   information: newlib/acinclude.m4
 - define __NEWLIB__, __NEWLIB_MINOR__ and __NEWLIB_PATCHLEVEL__
   This is in line with what gcc does for its version macros. See:
   https://gcc.gnu.org/onlinedocs/cpp/Common-Predefined-Macros.html

This patch moves the definition of the _NEWLIB_VERSION, __NEWLIB__
and __NEWLIB_MINOR__ macros from newlib/libc/include/sys/features.h,
to the newly generated newlib/_newlib_version.h file. Additionally,
the __NEWLIB_PATCHLEVEL__ macro was created, for completeness.

In order to stay backwards compatible, newlib/_newlib_version.h gets
included by newlib/newlib.h and newlib/libc/include/sys/features.h.

Note: This patch does _not_ include the modifications to the following
files, as these should all be generated any way.
      *Makefile.in,
      *aclocal.m4,
      *configure
      stamp-* files

Signed-off-by: Pieter du Preez <pdupreez@gmail.com>

1 files changed, 1 insertions, 5 deletions

diff --git a/newlib/libc/include/sys/features.h b/newlib/libc/include/sys/features.h
index 0c6043cf9..e3168beaa 100644
--- a/newlib/libc/include/sys/features.h
+++ b/newlib/libc/include/sys/features.h
@@ -25,11 +25,7 @@
 extern "C" {
 #endif
 
-/* Macros to determine that newlib is being used.  Put in this header to 
- * be similar to where glibc stores its version of these macros.
- */
-#define __NEWLIB__  		2
-#define __NEWLIB_MINOR__  	2
+#include <_newlib_version.h>
 
 /* Macro to test version of GCC.  Returns 0 for non-GCC or too old GCC. */
 #ifndef __GNUC_PREREQ