http://gcc.gnu.org/ml/gcc/2005-04/msg01429.html
I do have three suggestions for you:
>
> 1) The current way to tell the compiler not to throw away
> apparently-unused data is __attribute__((used)), like this:
>
> static const char __attribute__((used)) rcs_sccs_id[] =
> "$Id: @(#)%M% %I% 20%E% %U% copyright 2005 %Q% string1\\ $";
On Mon, Oct 17, 2011 at 2:04 PM, Oleg Goldshmidt <p...@goldshmidt.org> wrote:
>
> "Nadav Har'El" <n...@math.technion.ac.il> writes:
>
> > #if (__GNUC__ >= 4) && (__GNUC_MINOR__ > 4)
> > #define USED(x) x __attribute__((used))
> > #else
> > #define USED(x) x
> > #endif
> > #define IDENT(x) static const char USED(foo_src_id[]) = x;
> >
> > and then in each file just do
> > #include "ident.h"
> > IDENT("$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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>
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