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Re: other/1512: Path confusion w/ -print-prog-name + autoconf
- From: Nathan Neulinger <nneul at umr dot edu>
- To: bangerth at dealii dot org, gcc-bugs at gcc dot gnu dot org, gcc-prs at gcc dot gnu dot org, nobody at gcc dot gnu dot org, gcc-gnats at gcc dot gnu dot org
- Date: 05 Dec 2002 21:43:51 -0600
- Subject: Re: other/1512: Path confusion w/ -print-prog-name + autoconf
- Organization: University of Missouri - Rolla
- References: <20021205200112.25247.qmail@sources.redhat.com>
On Thu, 2002-12-05 at 14:01, bangerth@dealii.org wrote:
> Synopsis: Path confusion w/ -print-prog-name + autoconf
>
> State-Changed-From-To: open->feedback
> State-Changed-By: bangerth
> State-Changed-When: Thu Dec 5 12:01:11 2002
> State-Changed-Why:
> This is a rather old report. I don't think I understand the
> issue properly from the description, but would like to ask
> anyway whether the problem still exists in present versions
> of gcc?
>
> Thanks
> Wolfgang
>
> http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=1512
Don't know. I am still using the workaround I'm came up with when I
submitted that report. However, you ask at an opportune time - as I'll
probably be trying to install the version you just released soon, and
can try installing it without the workaround and test.
To more clearly explain the issue:
I install products via a set of link trees. To get to the resulting
binary, several links are traversed. The resulting path of the
executable winds up with ..'s in it due to the way gcc is choosing to
generate the paths to installation dirs.
i.e.:
/umr/devbin/../lib/gcc-lib/i686-pc-linux-gnu/2.97/../../../../i686-pc-linux-gnu/bin/ld
That path, when processed as a whole, is valid. Problem is, autoconf
appears to be compacting down the ..'s itself improperly or something.
Short explanation:
/umr/devbin points to /afs/....../trees/.../bin
/umr/devbin/../lib points to /afs/....../trees/.../lib
problem is, autoconf is seemingly turning that into
checking for ld used by GCC... (cached) /umr/i686-pc-linux-gnu/bin/ld
checking if the linker (/umr/i686-pc-linux-gnu/bin/ld) is GNU ld...
(cached) no
It's removing the ..'s by stripping off pairs of .. and dirname. That
would be fine if they were all REALLY dirs. i.e.
/umr/devbin/../lib == /umr/lib IFF /umr, /umr/devbin are DIRS
/umr/devbin/../lib != /umr/lib IF /umr/devbin is a symlink.
It's really an autoconf macro problem with how it is processing the ..'s
in path improperly, however, it would be mitigated by having gcc return
a less ..-happy path.
Please let me know if I can explain this further. I'll let you know if
it is still an issue with the version y'all just released when I get it
installed.
-- Nathan
------------------------------------------------------------
Nathan Neulinger EMail: nneul@umr.edu
University of Missouri - Rolla Phone: (573) 341-4841
Computing Services Fax: (573) 341-4216