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, 11 insertions, 0 deletions

diff --git a/newlib/_newlib_version.hin b/newlib/_newlib_version.hin
new file mode 100644
index 000000000..03d4e3d47
--- /dev/null
+++ b/newlib/_newlib_version.hin
@@ -0,0 +1,11 @@
+/* Version macros for internal and downstream use. */
+#ifndef _NEWLIB_VERSION_H__
+#define _NEWLIB_VERSION_H__ 1
+
+#undef _NEWLIB_VERSION
+#undef __NEWLIB__
+#undef __NEWLIB_MINOR__
+#undef __NEWLIB_PATCHLEVEL__
+
+#endif /* !_NEWLIB_VERSION_H__ */
+