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

[Daniel Jacobowitz]

The following reply was made to PR preprocessor/8505; it has been noted by GNATS.

From: Daniel Jacobowitz <drow@mvista.com>
To: Zack Weinberg <zack@codesourcery.com>
Cc: benoit.poulot-cazajou@jaluna.com, stephane.carbillet@jaluna.com,
	gcc-gnats@gcc.gnu.org, gcc-bugs@gcc.gnu.org
Subject: Re: preprocessor/8505: cross cpp0 use PREFIX_INCLUDE_DIR=$prefix/include
Date: Mon, 7 Apr 2003 09:09:51 -0400

 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