[llvm-dev] Running llvm test-suite

[Matthias Braun via llvm-dev]

> On Aug 11, 2016, at 6:00 PM, Hongbin Zheng <etherzhhb at gmail.com> wrote:
> 
> Hi Matthias,
> 
> Thanks a lot for the explanation. 
> 
> On Thu, Aug 11, 2016 at 11:45 AM, Matthias Braun <mbraun at apple.com <mailto:mbraun at apple.com>> wrote:
> Yes the test-suite can be run without lnt (you can always just look at the LNT logfiles to see what commands it is running and run those yourself).
> 
> Currently I would recommend using the cmake/lit version of the test-suite. You typically do something like:
> 
> mkdir build && cd build
> cmake -GNinja -DCMAKE_C_COMPILER=/path/to/my/clang -DTEST_SUITE_ARCH_FLAGS="-arch arm64" /path/to/test-suite
> ninja      # to build the benchmarks
> llvm-lit   # to run the benchmarks
> 
> You should check "ccmake"/"cmake -LA" to learn about the available options as well as llvm-lit. You can either use llvm-lit from an llvm build or use the pypy packaged version (pip install lit). The cmake/lit version has no support to run custom backends through llc at the moment, you need to have a clang version that accepts -arch XXX for your target.
> Sorry I didn't explain well. Here I want to use testsuite to test a customized compilation flow like:
> 
> clang -> opt-> <some other optimization tool> -> llc.
> 
> Is this possible by changing some of the makefile of llvm testsuite? 
It's probably possible by using one of the existing TEST.* files or writing your own. Unfortunately this system can get complicated and is not documented much. I don't really know how it works.

An alternative to this could be that you write your own little python/shell script that acts like a compiler on the outside but internally translates to clang, opt, llc commands you want. You could point CMAKE_C_COMPILER to that script.

- Matthias

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