[LLVMdev] LNT: failing to parse compiler info: what am I doing wrong?

David Blaikie dblaikie at gmail.com
Wed Sep 5 21:58:15 PDT 2012

On Wed, Sep 5, 2012 at 7:23 PM, Sean Silva <silvas at purdue.edu> wrote:
> Hi, I'm trying to use LNT to run the test-suite. I followed the
> instructions on <http://lnt.llvm.org/quickstart.html>. When I run it I
> get this error:
> (mysandbox)sean:~/pg/others/llvm % lnt runtest nt --sandbox mysandbox
> --cc ~/pg/others/llvm/release/bin/clang --test-suite test-suite
> nt.py:1185: note: inferred C++ compiler under test as:
> '/home/sean/pg/others/llvm/release/bin/clang++'
> 2012-09-06 02:03:16: checking source versions
> compilers.py:81: error: unable to determine compiler version:
> '/home/sean/pg/others/llvm/release/bin/clang': 'clang version 3.2 '
> Traceback (most recent call last):
>   File "/home/sean/pg/others/llvm/mysandbox/bin/lnt", line 9, in <module>
>     load_entry_point('LNT==0.4.1dev', 'console_scripts', 'lnt')()
>   File "/home/sean/pg/others/llvm/lnt/lnt/lnttool/main.py", line 281, in main
>     commands[cmd](cmd, args[1:])
>   File "/home/sean/pg/others/llvm/lnt/lnt/lnttool/main.py", line 149,
> in action_runtest
>     report = test_instance.run_test('%s %s' % (name, test_name), args)
>   File "/home/sean/pg/others/llvm/lnt/lnt/tests/nt.py", line 1288, in run_test
>     report = run_test(nick, opts, None, report_dir)
>   File "/home/sean/pg/others/llvm/lnt/lnt/tests/nt.py", line 645, in run_test
>     target_flags)
>   File "/home/sean/pg/others/llvm/lnt/lnt/testing/util/compilers.py",
> line 82, in get_cc_info
>     cc_name,cc_version_num,cc_build_string,cc_extra = m.groups()
> AttributeError: 'NoneType' object has no attribute 'groups'
> I took a look at the code and basically it's doing some nasty ad-hoc
> regex parsing to try to figure out the compiler version and when the
> regex doesn't match,

And it doesn't match probably because of one of two things (& I forget
which of the two, if either, have been addressed/workaround):

1) using cmake instead of configure/make
2) using git instead of svn

One or both of these create versions that lnt doesn't understand
(because they don't include the SVN revision number in the clang
version info) - if I recall correctly.

Yes, LNT could probably be improved not to completely fall over on
this, and/or the different build systems/vcs could be improved to play
more nicely by providing better version info.

> the re library returns None, which it later dies
> on. I'm no stranger to Python and would be happy to hack around this,
> but I find it strange that a vanilla Clang is causing this to barf,
> since presumably clang is the most heavily used; and there's even code
> in there for pulling out versions from GCC and ICC!
> Am I doing something wrong? It certainly feels like I'm doing
> something wrong. If not I'll hack around it and send in a patch.
> I'd be glad to provide clang output (e.g. -v) if it would help to
> understand the problem; just let me know what you want, since I'm not
> sure exactly what would be most helpful.
> Another thing: aren't those calls to `error()` in compilers.py
> supposed to abort the processing immediately? I mean, it does a None
> check, calls `error()` and prints an error message, and then barfs
> executing code that assumes that the match object is not None. The
> C/C++ equivalent would be:
> if (p == NULL)
>   error("p is NULL"); // Just prints, doesn't longjmp or throw an
> exception or anything.
> do_something(p->foo);
> --Sean Silva
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