Re: Possible bug in many acspecific tests under AC_LANG(C++)

[Andreas Schwab]

Paul Eggert <address@hidden> writes:

|> We could change Autoconf so that it first tries to link this program
|> instead:
|> 
|>      #include "confdefs.h"
|>      [Put the standard includes here.]
|> 
|>      int
|>      main ()
|>      {
|>      #if defined (__stub_$ac_func) || defined (__stub___$ac_func)
|>      choke me
|>      #else
|>        return $ac_func != 0;
|>      #endif
|>      }
|> 
|> If this works, the function exists; otherwise, 'configure' should fall
|> back on trying to link the old program.
|> 
|> We need the fallback because many hosts still don't declare functions.
|> Once C99 takes over the world, we can remove the fallback, since C99
|> requires that all functions must be declared.

But this also requires including all the necessary headers, which
AC_CHECK_FUNC[S] cannot do currently.  So the old method will continue to
be necessary for the generic function tests.

Andreas.

-- 
Andreas Schwab, SuSE Labs, address@hidden
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