[Bug testsuite/36443] [4.3/4.4 Regression]: HOSTCC doesn't work with unstalled gcc

["mark at codesourcery dot com" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #9 from mark at codesourcery dot com  2008-06-08 20:23 -------
Subject: Re:  [4.3/4.4 Regression]: HOSTCC doesn't work
 with unstalled gcc

hjl dot tools at gmail dot com wrote:

> How does gcc search the right paths when GCC_EXEC_PREFIX points
> to non-existent directory because gcc isn't installed? Even if
> there is a GCC_EXEC_PREFIX directory, it could be a very old
> gcc installation and you may search very old files, instead of
> the current ones, which are just built, but not installed yet.

I don't remember all of the details of these changes.

However, the compiler historically searched the configured libdir no 
matter what.  This problem with having random old stuff in the place 
where you're going to be installing the new compiler is not new.  People 
wanted that behavior for in-tree testing so that if you've already put a 
new libc in libdir the compiler you're testing can find it.

I suspect that if you remove the setting in site.exp you will break the 
following scenario:

1. User puts libraries/headers in $pefix/{lib,include}
2. User builds GCC with corresponding --prefix option
3. User runs "make check"


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36443