[llvm-dev] How to execute cross-compiled libcxx tests on a remote target?
Dominik Montada via llvm-dev
llvm-dev at lists.llvm.org
Thu May 28 03:19:22 PDT 2020
Hi Louis,
I saw that you were the one who implemented the new testing system for
libcxx, so I figured that you might be able to help me out with my problem.
I'm working on a downstream target and we're now in the process of
adding support for libcxx. We would like to leverage the existing libcxx
test suite to make sure that the implementation is working correctly.
The problem is that our target is a bare-metal target and we need to
cross-compile the tests and execute them remotely. There isn't really
any documentation for how to do it, but I came across an old email
thread from 2015 which said to implement an executor and use that.
However, it seems like those executors are not used with the new test
format any longer (except for a check whether to use `run.py` or `ssh.py`).
Also, in the original Phabricator review where you first introduced the
new format, you said:
>As a side effect of this design, configuration files for the test
suite can be as simple as:
>
>config.substitutions.append(('%{cxx}', '<path-to-compiler>'))
>config.substitutions.append(('%{compile_flags}', '<flags>'))
>config.substitutions.append(('%{link_flags}', '<flags>'))
>config.substitutions.append(('%{exec}', '<script-to-execute>'))
>
>This should allow storing lit.cfg files for various configurations
directly in the repository
However I'm not sure what exactly I need to do here. Do I need to write
my own `lit.site.cfg` and point CMake to it? If possible I'd like to
reuse the default- and auto-generated config as much as possible.
We have a script which can execute a cross-compiled binary on our remote
target. I just want the test suite to call this script. Could you give
me some help on what I need to do to make this work?
Cheers,
Dominik
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