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How to accumulate tokens in #define'd ident ?
- From: phi gcc <phi dot gcc at gmail dot com>
- To: "gcc-help at gcc dot gnu dot org" <gcc-help at gcc dot gnu dot org>
- Date: Tue, 27 May 2014 07:11:55 +0200
- Subject: How to accumulate tokens in #define'd ident ?
- Authentication-results: sourceware.org; auth=none
Hi All,
I have a beginner question.
I have an ident that I #define this is a comma separated list of other
ident, and I'd like to augment this list, i.e basically something like
#define L a
#define T L
#undef L
#define L T,b
I have a growing list of ident (here a,b) I'd like to grow this as
include files to end up with a,b,c,d at some point this is given to a
va_args function like f(L)
Indeed I know that the above #define/#undef will not make it, yet I
tried a lot of combo with ## in macro like
#define A(l,x) l##,##x
#define l a
#define t A(l,b)
#undef l
#define l t
But nothing works.
Thanx for any helps
Cheers,
Phi