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Re: Which header a symbol is declared in (AC_CHECK_DECLS) ?
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From: |
Eric Blake |
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Subject: |
Re: Which header a symbol is declared in (AC_CHECK_DECLS) ? |
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Date: |
Mon, 27 Apr 2009 06:09:09 -0600 |
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According to Konstantin Andreev on 4/27/2009 3:20 AM:
> Hello.
>
> Could you advise, how to correctly determine which header a symbol is
> declared in ?
Why? Functionally, all you need to know is whether a symbol is declared
within a set of headers, rather than trying to go the extra mile to figure
out which exact header. So for this particular case, I would have used
something like:
AC_CHECK_DECLS([bzero],[],[],[AC_INCLUDES_DEFAULT
[#include <string.h>
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
]])
to find whether bzero is declared in either string.h or strings.h, then
include both headers in my code.
But ultimately, bzero is declared obsolete by POSIX. If you REALLY want
to be portable, I'd write your code to use memset and not bzero.
- --
Don't work too hard, make some time for fun as well!
Eric Blake address@hidden
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