<pre><a href="http://gcc.gnu.org/ml/gcc/2005-04/msg01429.html">http://gcc.gnu.org/ml/gcc/2005-04/msg01429.html</a><br><br><br> 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\\ $";
<br><br></pre><br><br><div class="gmail_quote">On Mon, Oct 17, 2011 at 2:04 PM, Oleg Goldshmidt <span dir="ltr"><<a href="mailto:pub@goldshmidt.org">pub@goldshmidt.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div class="im"><br>
"Nadav Har'El" <<a href="mailto:nyh@math.technion.ac.il">nyh@math.technion.ac.il</a>> writes:<br>
<br>
</div><div class="im">> #if (__GNUC__ >= 4) && (__GNUC_MINOR__ > 4)<br>
> #define USED(x) x __attribute__((used))<br>
> #else<br>
> #define USED(x) x<br>
> #endif<br>
> #define IDENT(x) static const char USED(foo_src_id[]) = x;<br>
><br>
> and then in each file just do<br>
> #include "ident.h"<br>
> IDENT("$Id");<br>
<br>
</div>The proper contents of ident.h would actually be<br>
<br>
#ifndef _IDENT_H_<br>
#define _IDENT_H_<br>
<br>
#if defined(__GNUC__)<br>
<div class="im">#define USED(x) x __attribute__((used))<br>
#else<br>
#define USED(x) x<br>
#endif<br>
<br>
</div>#define IDENT(s,x) static const char USED(s[]) = x<br>
<br>
#endif<br>
<br>
- this is because one would want to use different identifiers in every<br>
file to avoid a) clashes when keywords are used in header files (very<br>
useful: which versions of the headers was this file compiled with?) and<br>
b) possible effects of -fmerge-constants and friends.<br>
<font color="#888888"><br>
--<br>
Oleg Goldshmidt | <a href="mailto:pub@goldshmidt.org">pub@goldshmidt.org</a><br>
</font><div><div></div><div class="h5"><br>
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