[lldb-dev] check-lldb will start using in-tree clang by default

Davide Italiano via lldb-dev lldb-dev at lists.llvm.org
Fri Oct 27 12:45:52 PDT 2017

So, I wiped out my directory for the build and then I created it again using
cmake -GNinja ../

I found out what the bug/problem is, BTW (was going to reply to this
e-mail but you've beaten me to the punch).
You switched LLDB to build with an in-tree clang, but ninja check-lldb
doesn't really require clang to be built.
As such, once I cleaned up my checkout, I ended up typing just `ninja
check-lldb` and that failed because clang wasn't built.
I claim that `ninja check-lldb` should list clang as dependency when
we're running the tests with the in-tree clang.



On Fri, Oct 27, 2017 at 12:41 PM, Pavel Labath <labath at google.com> wrote:
> Did you clean your cmake cache before runinng this? Does
> '/home/davide/work/build-lldb/bin/clang' correctly refer to a clang
> binary you just built?
> On 27 October 2017 at 12:39, Davide Italiano <dccitaliano at gmail.com> wrote:
>> Yes, it seems `configuration.compiler` is None, so this explodes:
>> [...]
>>         if not is_exe(configuration.compiler):
>> [...]
>> On Fri, Oct 27, 2017 at 12:37 PM, Davide Italiano <dccitaliano at gmail.com> wrote:
>>> I think that this change (or some change nearby) broke `check-lldb` on Fedora.
>>> I'm investigating, but in the meanwhile, here's the log.
>>> $ ninja check-lldb
>>> [2/2] Testing LLDB (parallel execution, with a separate subprocess per test)
>>> Traceback (most recent call last):
>>>   File "/home/davide/work/llvm-lldb/tools/lldb/test/dotest.py", line
>>> 7, in <module>
>>>     lldbsuite.test.run_suite()
>>>   File "/home/davide/work/llvm-lldb/tools/lldb/packages/Python/lldbsuite/test/dotest.py",
>>> line 1099, in run_suite
>>>     parseOptionsAndInitTestdirs()
>>>   File "/home/davide/work/llvm-lldb/tools/lldb/packages/Python/lldbsuite/test/dotest.py",
>>> line 282, in parseOptionsAndInitTestdirs
>>>     if not is_exe(configuration.compiler):
>>>   File "/home/davide/work/llvm-lldb/tools/lldb/packages/Python/lldbsuite/test/dotest.py",
>>> line 54, in is_exe
>>>     return os.path.isfile(fpath) and os.access(fpath, os.X_OK)
>>>   File "/usr/lib64/python2.7/genericpath.py", line 37, in isfile
>>>     st = os.stat(path)
>>> TypeError: coercing to Unicode: need string or buffer, NoneType found
>>> FAILED: cd /home/davide/work/build-lldb/tools/lldb/test &&
>>> /usr/bin/python2.7
>>> /home/davide/work/llvm-lldb/tools/lldb/test/dotest.py -q --arch=x86_64
>>> --executable /home/davide/work/build-lldb/bin/lldb -s
>>> /home/davide/work/build-lldb/lldb-test-traces -S nm -u CXXFLAGS -u
>>> CFLAGS -C /home/davide/work/build-lldb/bin/clang --env
>>> ARCHIVER=/usr/bin/ar --env OBJCOPY=/usr/bin/objcopy
>>> ninja: build stopped: subcommand failed.
>>> On Thu, Oct 26, 2017 at 7:18 PM, Pavel Labath via lldb-dev
>>> <lldb-dev at lists.llvm.org> wrote:
>>>> I am going to check in a change (D39215) which causes the check-lldb
>>>> target to use the just-built clang for compiling the test inferiors
>>>> (instead of the system compiler, which was the old default). The main
>>>> reason for this is to provide better reproducibility of test results
>>>> between different machines/developers, by removing one of the main
>>>> sources of nondeterminism. This behavior can be overridden by setting
>>>> the LLDB_TEST_C_COMPILER and LLDB_TEST_CXX_COMPILER cmake variables.
>>>> For the change to take effect you will need to clean your build folder
>>>> (or at least, remove the affected variables from your CMakeCache.txt).
>>>> After this you may observe a change in the test results from the
>>>> check-lldb run.
>>>> Note that this change only affect cmake code -- if you run your tests
>>>> by running dotest.py directly, nothing will change for you.
>>>> regards,
>>>> pavel
>>>> _______________________________________________
>>>> lldb-dev mailing list
>>>> lldb-dev at lists.llvm.org
>>>> http://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev

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