[llvm-dev] Running LIT based testcases outside of llvm source

[Min-Yih Hsu via llvm-dev]

Hi, I'm the author of that blog post.

Without knowing the details of your issue, my guess is that somehow LIT
didn't execute the correct config file.
Long story short, there are two LIT config files: The one you put in source
directory (lit.cfg.py) and the other one (lit.site.cfg.py), which is
generated from a template file (lit.site.cfg.py.in), in the build direcotry
The latter one is the config file LIT should execute first, because it's
actually a trampoline that sets up some environment -- the my_obj_root is
one of them -- before executing the real config file, lit.cfg.py in the
source directory.

To answer your section question, there _is_ a simpler way to run LIT: Write
a simple lit.cfg.py, put side by side with your test file, and launch LIT
at the same directory, period. IIRC this is also the example I showed at
the beginning of the blog post.
The problem is, if you have a separate build directory -- just like LLVM or
most of the CMake-based projects -- you will have a hard time configuring
the path to your program using this simple setup. The fancy trampoline
trick adopted by LLVM is only designed to configure the paths to various
tools -- like clang and opt -- used in the test file.

Hope that answer your question
-Min

On Tue, Mar 30, 2021 at 8:27 AM Tejas Joshi via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hello,
>
> So far, I have been copying .ll lit bases test cases in some
> /llvm-project/llvm/test/<directory>
> and then running them with
> /build-dir/bin/llvm-lit.
>
> Now, I need to run these test cases without adding them to llvm source,
> using
> /build-dir/bin/llvm-lit
> or
> /install-dir/bin/llvm-lit
> So to create similar test suite environment outside of source, I followed:
> <https://medium.com/@mshockwave/using-llvm-lit-out-of-tree-5cddada85a78>
> with some relevant changes but I am stumbling on error:
> AttributeError: 'TestingConfig' object has no attribute 'my_obj_root'
>
> Any changes that I am missing here?
>
> OR
> Regardless of the above link. Is there a simpler way to do this where
> I can run any IR based test cases outside of llvm source while
> referring to the corresponding tool in /build-dir/bin/ or
> /install-dir/bin/?
>
> Thanks,
> Tejas
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
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>


-- 
Min-Yih Hsu
Ph.D Student in ICS Department, University of California, Irvine (UCI).
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