Autoconf and duplicated function tests

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2 total messages Started by Francois Pinard Wed, 19 Aug 1992 17:55

#674

Author: Francois Pinard
Date: Wed, 19 Aug 1992 17:55

31 lines
1556 bytes

Hi, people.  In one application, my configure.in contains:

	AC_HAVE_FUNCS(strstr)
	AC_REPLACE_FUNCS(strstr)

I wonder if the double check generated in configure by autoconf could
be avoided.  Once AC_HAVE_FUNCS knows for some function, the test does
not need to be done again for AC_REPLACE_FUNCS.

Here is the logic behind this particular usage.  The AC_REPLACE_FUNCS
is for providing a replacement strstr if the standard library does not
contain it, it just plays with the Makefile variable LIBOBJS.  The
AC_HAVE_FUNCS determination is transmitted, via DEFS, to the module
calling strstr, which uses it the following way:

	#ifdef USG
	#include <string.h>
	#else
	#include <strings.h>
	#endif
	#ifndef HAVE_STRSTR
	const char *strstr ();
	#endif

If the system already offers strstr, <string.h> or <strings.h> will
declare it, and my own definition will fatally conflict.

-- 
Franc,ois Pinard        ``Vivement GNU!''        pinard@iro.umontreal.ca
(514) 588-4656                                    ...!uunet!iros1!pinard
Consider joining the League for Programming Freedom.  Email for details!

Re: Autoconf and duplicated function tests

#686

Author: Roland McGrath
Date: Thu, 20 Aug 1992 08:18

15 lines
897 bytes

> 	#ifdef USG
> 	#include <string.h>
> 	#else
> 	#include <strings.h>
> 	#endif
> 	#ifndef HAVE_STRSTR
> 	const char *strstr ();
> 	#endif
> 
> If the system already offers strstr, <string.h> or <strings.h> will
> declare it, and my own definition will fatally conflict.

That is only because your declaration is wrong.  The correct declaration,
"char *strstr ();" should not conflict with a correct prototype in
<string.h>.

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