Add support for __COUNTER__.

__COUNTER__ allows one to obtain incrementing (read: unique) numbers
from the C preprocesor. This is useful when implementing things like a
robust implementation of CTASSERT(), which currently fails when using
it more than once on a single line of code. Probably not likely to cause
any breakage, but still.

__COUNTER__ was also added to GCC 4.3, but since that implementation is
GPLv3 licensed, I took the liberty of implementing it without looking at
any upstream sources. Therefore, this version is licensed under the same
license as the rest of the code; GPLv2.

1 files changed, 2 insertions, 0 deletions

diff --git a/contrib/gcclibs/libcpp/internal.h b/contrib/gcclibs/libcpp/internal.h
index 857bfe1..addff61 100644
--- a/contrib/gcclibs/libcpp/internal.h
+++ b/contrib/gcclibs/libcpp/internal.h
@@ -448,6 +448,8 @@ struct cpp_reader
   /* A saved list of the defined macros, for dependency checking
      of precompiled headers.  */
   struct cpp_savedstate *savedstate;
+
+  unsigned int nextcounter;
 };
 
 /* Character classes.  Based on the more primitive macros in safe-ctype.h.