openssh bugs - Feb 2009 - [Bug 1559] New: Autoconf overrides AR environment variable

https://bugzilla.mindrot.org/show_bug.cgi?id=1559

           Summary: Autoconf overrides AR environment variable
           Product: Portable OpenSSH
           Version: 5.1p1
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Build system
        AssignedTo: unassigned-bugs at mindrot.org
        ReportedBy: Brice.Lin at gmail.com


Reproduced on Linux (x86) and Mac OS X (PPC and x86):

$ LD="ld" AR="foo" ./configure

Running the above command results in Autoconf incorrectly setting the
AR variable in the generated Makefile. Setting CC instead of LD causes
the same issue, while only specifying AR works without issue.

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Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |djm at mindrot.org




--- Comment #1 from Damien Miller <djm at mindrot.org>  2009-02-21
14:41:41 ---
It works for me:

$ env LD=/tmp/xxld AR=/tmp/har ./configure
...
$ egrep "^(LD|AR)=" Makefile
LD=/tmp/xxld
AR=/tmp/har

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--- Comment #2 from Brice Lin <Brice.Lin at gmail.com>  2009-02-21
18:28:26 ---
I pulled the tarball from
ftp://ftp.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-5.1p1.tar.gz
to generate the error. Did you use that as well?

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--- Comment #3 from Brice Lin <Brice.Lin at gmail.com>  2009-02-21
19:51:22 ---
$ env LD=/tmp/xxld AR=/tmp/har ./configure
$ egrep "^(LD|AR)=" Makefile
LD=/tmp/xxld
AR=/tmp/har

$ env LD="ld" AR="foo" ./configure
$ egrep "^(LD|AR)=" Makefile      
LD=ld
AR=/usr/bin/ar

For some reason, the command on top works differently than the one on
bottom.

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--- Comment #4 from Damien Miller <djm at mindrot.org>  2009-02-22
08:50:17 ---
do you really have a semi-functional ar-replacement called "foo" in
your path? autoconf checks that the selected linker at least exists and
is executable. Furthermore if the linker exists, but is not functional,
then it will cause configure test failures.

Try copying your /usr/bin/ar to a different path (e.g. /tmp/har) and
trying it.

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--- Comment #5 from Brice Lin <Brice.Lin at gmail.com>  2009-02-22
09:39:10 ---
I need to compile with LLVM, which requires pointing AR to llvm-ar
(which exists). That's how I encountered the bug in the first place.
What I posted just serves as an example test case of the issue.

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--- Comment #6 from Damien Miller <djm at mindrot.org>  2009-02-22
10:10:51 ---
It is an invalid testcase for the reasons that I just described. 

If you are trying to use llvm-ar then why not show an example with
llvm-ar? You can look at the details of what searches are being
performed in config.log.

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--- Comment #7 from Brice Lin <Brice.Lin at gmail.com>  2009-02-22
11:45:53 ---
$ env CC="llvm-gcc" LD="llvm-ld" AR="llvm-ar"
RANLIB="llvm-ranlib"
./configure
$ egrep "^(CC|LD|AR|RANLIB)=" Makefile
CC=llvm-gcc
LD=llvm-ld
AR=/usr/bin/ar
RANLIB=llvm-ranlib
$ llvm-ar 
llvm-ar: Not enough positional command line arguments specified!
Must specify at least 2 positional arguments: See: llvm-ar --help

After running the above commands, I combed through config.log for
llvm-ar, but nothing shows up. I've included what seems like the
relevant lines from config.log. What else should I look for to debug
this?

$ egrep "( |\W)(ar|ranlib)\W*$" config.log
configure:4038: checking for ranlib
configure:4065: result: llvm-ranlib
configure:4256: checking for ar
configure:4274: found /usr/bin/ar
configure:4286: result: /usr/bin/ar
ac_cv_path_AR=/usr/bin/ar
ac_cv_prog_ac_ct_RANLIB=llvm-ranlib
AR='/usr/bin/ar'
RANLIB='llvm-ranlib'

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--- Comment #8 from Damien Miller <djm at mindrot.org>  2009-02-22
19:39:22 ---
Try an absolute path for AR (I have no idea why autoconf demands this)

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--- Comment #9 from Brice Lin <Brice.Lin at gmail.com>  2009-02-22
21:56:14 ---
Thanks, setting AR to the absolute path of llvm-ar works. It still
seems like a bug with Autoconf though. There's no reason for it to
require absolute paths, especially because it perfectly detects them
for the other environment variables (like RANLIB). Can you do anything
about it?

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--- Comment #10 from Damien Miller <djm at mindrot.org>  2009-02-23
08:07:37 ---
Probably not - it is buried deep in the guts of autoconf (... and you
thought this thing smelt bad on the outside). I'd suggest filing a but
on them.

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Darren Tucker <dtucker at zip.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dtucker at zip.com.au
             Status|NEW                         |RESOLVED
         Resolution|                            |WONTFIX


--- Comment #11 from Darren Tucker <dtucker at zip.com.au> 2009-08-28
18:20:45 EST ---
Since there's a workaround and the problem is in autoconf generated
file we're not going to try to bodge around it.

Thanks for the report, sorry we couldn't help.  Closing.

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Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED

--- Comment #12 from Damien Miller <djm at mindrot.org> 2009-10-06
15:02:40 EST ---
Mass move of RESOLVED bugs to CLOSED now that 5.3 is out.

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