Re: AC_CHECK_FUNC is not compatible with gcc -Werror

[Paolo Bonzini]

On 01/22/2010 02:35 AM, Eric Blake wrote:
> It would be even slicker to do this without having to recompile (that is,
> rewrite AC_LANG_FUNC_LINK_TRY to use the new logic, rather than making
> AC_CHECK_FUNC call AC_LINK_IFELSE twice).

Since typeof(__builtin_strfry) gives an error, you'd then have two 
compilation for the common case when there is _not_ a corresponding GCC 
builtin.

Still, Dmitry's patch is definitely on the right way.  You just need to 
change the "#ifndef __GNUC__" into a shell test for 
"$GCC:$ac_[]_AC_LANG_ABBREV[]_werror_flag" = yes:yes.

Paolo