preprocessor/8505: cross cpp0 use PREFIX_INCLUDE_DIR=$prefix/include

[Daniel Jacobowitz]

On Thu, Apr 03, 2003 at 05:05:20PM -0800, Zack Weinberg wrote:
> 
> [http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=8505]
> 
> My apologies for letting this go for so long.
> 
> I am not expert in the domain of cross compilers, and I can think of
> plausible reasons both to have the PREFIX_INCLUDE_DIR searched and
> not to have it searched.  It would be consistent with what is done
> for other directories, like LOCAL_INCLUDE_DIR, not to search it;
> however, it appears that this directory has been searched in cross
> compilers since forever, so people might be depending on the existing
> behavior.
> 
> I would appreciate opinions.  Dan, I'm cc:ing you because you've had
> your fingers in this area recently.

If you look at 3.4, you'll see the test has changed:
if test x$with_sysroot = x && test x$host = x$target \
   && test "$prefix" != "/usr" && test "x$prefix" != "x$local_prefix" ; then
  AC_DEFINE_UNQUOTED(PREFIX_INCLUDE_DIR, "$prefix/include")
fi

i.e. cross compilers no longer search $prefix/include/.  I'm sre it'll
break someone's setup somewhere; however, it also just makes more sense
this way.

-- 
Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer