[llvm-dev] bugpoint --tool-args and --safe-tool-args

[Matthias Braun via llvm-dev]

> On Jul 31, 2018, at 11:11 AM, Matthias Braun <mbraun at apple.com> wrote:
> 
> This is what works for me, when I want to reduce an llc failure triggering a failure with a "foo bar baz" in the assert message (the grep for the error message avoids reducing to an unrelated failure):
> 
> $ cat run_llc.sh
> #!/bin/sh
> if ! $HOME/dev/llvm/build/bin/llc "$@" 2>&1 | grep "foo bar baz"; then
> 	exit 0
> else
> 	exit $?
> fi
> 
> $ PATH=$HOME/path/to/my/llvm/build/bin:$PATH bugpoint -compile-custom -compile-command ./run_llc.sh test.ll
Also:
- Make sure the script is executable `chmod +x run_llc.sh`.
- Try first that your run script behaves as expected. If you see bugpoint running for a long time without making real progress it's likely that the returncodes of your script aren't as you expect.


> 
> 
> - Matthias
> 
>> On Jul 31, 2018, at 11:03 AM, Friedman, Eli via llvm-dev <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>> wrote:
>> 
>> On 7/31/2018 10:10 AM, David Greene via llvm-dev wrote:
>>> I have a failing test and bugpoint would be the perfect tool to help
>>> narrow it down.
>>> 
>>> llc is the failing tool.  It fails with one set of options and passes
>>> with another.  I was hoping to use bugpoint like this:
>>> 
>>> bugpoint -safe-llc -run-llc <testcase> -tool-args <failing args> -safe-tool-args <passing args>
>>> 
>>> Unfortunately, this doesn't seem to be possible.  According to the
>>> documentation both -tool-args and -safe-tool-args consume all remaining
>>> arguments so bugpoint would never see -safe-tool-args above.
>>> 
>>> I tried it and indeed it looks like -safe-tool-args never makes it to
>>> llc.
>>> 
>>> For now I can build another llc which makes <failing args> default and
>>> then just use -safe-tool-args above but it's a bit painful.
>>> 
>>> Has anyone tried to use bugpoint like this before?  Any tips?
>> 
>> I've occasionally used shell script wrappers when I couldn't get bugpoint command-line parsing to work the way I wanted it to.
>> 
>> Looking at CommandLine.rst, PositionalEatsArgs is supposed to allow specifying something like the command you wrote, but I'm not sure it ever worked correctly; nothing other than bugpoint uses it, as far as I can tell.
>> 
>> -Eli
>> 
>> -- 
>> Employee of Qualcomm Innovation Center, Inc.
>> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project
>> 
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