[llvm-dev] Cannot run LLVM unit tests doe to python error in lit

[Michael Kruse via llvm-dev]

Thank you for sharing what the problems was.

Michael

[1] https://xkcd.com/979/

Am Fr., 23. Aug. 2019 um 04:51 Uhr schrieb Sergej Jaskiewicz
<jaskiewiczs at icloud.com>:
>
> Thank you for pointing a direction, Michael.
>
> This allowed me to investigate the issue, which was not in lit, but rather in CMake configuration.
>
> The issue was that when llvm-lit.py was executed, 'config_map', which maps lit config files from source directory to build directory, was empty, because the template for llvm-lit.py, llvm-lit.in, contains @LLVM_LIT_CONFIG_MAP@, which was being expanded to an empty string.
>
> Why was it expanded to an empty string?
>
> Well, as I’ve said, I’m building a cross-toolchain, which means that first I build llvm & clang, and then using the just-built compiler compiler-rt and friends are built. All of this in a single Ninja invocation. This is achieved by setting the -DLLVM_ENABLE_RUNTIMES="compiler-rt;libunwind;libcxxabi;libcxx" flag.
>
> It turns out that everything is OK at configure time for LLVM & clang, @LLVM_LIT_CONFIG_MAP@ is expanded correctly. But then, during the ninja invocation, after the compiler is built, a new CMake command is run _at build time_ to configure and build compiler-rt (namely builtins & runtimes) using the just-built compiler. This new CMake invocation calls ‘configure_file’ again, this time replacing @LLVM_LIT_CONFIG_MAP@ with an empty string, erasing the previous expansion.
>
> I’ll see if I can fix this, but currently I guess a workaround would be to first build LLVM & clang with  -DLLVM_ENABLE_RUNTIMES="", run the relevant tests, and only then build the runtimes.
>
> > On 21 Aug 2019, at 21:41, Michael Kruse <llvmdev at meinersbur.de> wrote:
> >
> > llvm_obj_root is supposed to be assigned in lit.site.cfg.py.in
> >
> > config.llvm_obj_root = "@LLVM_BINARY_DIR@"
> >
> > (which will `configure_file`ed by cmake). I can run ninja
> > check-llvm-unit on my Windows machine without problems. Maybe look for
> > lit.site.cfg.py in your build dir
> > (${CMAKE_BINARY_DIR}/tests/Unit/lit.site.cfg.py).
> >
> > Michael
> >
> >
> >
> >
> >
> > Am Mi., 21. Aug. 2019 um 10:52 Uhr schrieb Sergej Jaskiewicz via
> > llvm-dev <llvm-dev at lists.llvm.org>:
> >>
> >> Hello, LLVM community.
> >>
> >> I've built a cross-toolchain on Windows and I'm now trying to run unit tests for the LLVM libraries.
> >>
> >> I used Ninja as a build system and MSVC as host compiler without an issue, but when I try to run 'ninja check-llvm-unit', I get the following error:
> >>
> >> llvm-lit.py: C:/Users/sergej/Developer/llvm-project/llvm\utils\lit\lit\TestingConfig.py:102: fatal: unable to parse config file 'C:\\Users\\sergej\\Developer\\llvm-project\\llvm\\test\\Unit\\lit.cfg.py', traceback: Traceback (most recent call last):
> >>  File "C:/Users/sergej/Developer/llvm-project/llvm\utils\lit\lit\TestingConfig.py", line 89, in load_from_path
> >>    exec(compile(data, path, 'exec'), cfg_globals, None)
> >>  File "C:\Users\sergej\Developer\llvm-project\llvm\test\Unit\lit.cfg.py", line 24, in <module>
> >>    config.test_exec_root = os.path.join(config.llvm_obj_root, 'unittests')
> >> AttributeError: 'TestingConfig' object has no attribute 'llvm_obj_root'
> >> FAILED: test/CMakeFiles/check-llvm-unit
> >>
> >> From what I can see, the TestingConfig class (which can be found in llvm/utils/lit/lit/TestingConfig.py) doesn't have this 'llvm_obj_root' indeed. Also I can't spot any Python magic here like __getattr__. How is this supposed to work?
> >>
> >> Reproducible with both Python 2 and 3.
> >>
> >> Maybe anyone has an idea? I’d really appreciate any help
> >>
> >> _______________________________________________
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> >> llvm-dev at lists.llvm.org
> >> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>