"Nadav Har'El" <n...@math.technion.ac.il> writes:
> #if (__GNUC__ >= 4) && (__GNUC_MINOR__ > 4)
> #define USED(x) x __attribute__((used))
> #else
> #define USED(x) x
> #endif
> #define IDENT(x) static const char USED(foo_src_id[]) = x;
>
> and then in each file just do
> #include "ident.h"
> IDENT("$Id");
The proper contents of ident.h would actually be
#ifndef _IDENT_H_
#define _IDENT_H_
#if defined(__GNUC__)
#define USED(x) x __attribute__((used))
#else
#define USED(x) x
#endif
#define IDENT(s,x) static const char USED(s[]) = x
#endif
- this is because one would want to use different identifiers in every
file to avoid a) clashes when keywords are used in header files (very
useful: which versions of the headers was this file compiled with?) and
b) possible effects of -fmerge-constants and friends.
--
Oleg Goldshmidt | p...@goldshmidt.org
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