[LLVMdev] [llvm-commits] [PATCH] A "very verbose" mode for FileCheck

Jim Grosbach grosbach at apple.com
Thu Jan 17 10:32:37 PST 2013

On Jan 17, 2013, at 10:30 AM, Eli Bendersky <eliben at google.com> wrote:

> On Thu, Jan 17, 2013 at 10:20 AM, Jim Grosbach <grosbach at apple.com> wrote:
>> On Jan 17, 2013, at 9:57 AM, Dmitri Gribenko <gribozavr at gmail.com> wrote:
>>> On Thu, Jan 17, 2013 at 7:51 PM, Sean Silva <silvas at purdue.edu> wrote:
>>>> On Thu, Jan 17, 2013 at 8:36 AM, Dmitri Gribenko <gribozavr at gmail.com> wrote:
>>>>> We have to options:
>>>>> (a) replace 'FileCheck' with '%FileCheck' in all tests, and teach
>>>>> 'lit' to replace '%FileCheck' with 'FileCheck --dump-input-on-error';
>>>>> (b) teach 'lit' to replace a plain 'FileCheck'.
>>>>> The first approach seems cleaner to developers who read and write
>>>>> tests (it suggests that they are invoking some "macro" -- but does
>>>>> that matter?)  The second approach is much easier to implement since
>>>>> tests will be unchanged.
>>>> IMO the biggest issue with (a) is that developers will continue to use
>>>> `FileCheck` instead of `%FileCheck`. So IMO (a) should only be
>>>> implemented if simultaneously there is a change that makes just plain
>>>> `FileCheck` an error.
>>> I think that within a month this knowledge will be propagated to all developers.
>> I'd like to think so, too, but we still get patches that write tests using 'grep' instead of FileCheck.
> This is unfortunate. Last month I tweaked TestingGuide.rst to
> discourage grep in favor of FileCheck. It now says:
> "The recommended way to examine output to figure out if the test
> passes it using the FileCheck tool. The usage of grep in RUN lines is
> discouraged."
> However, perhaps it's time to remove any mention of grep from that document?

"Usage of grep in RUN lines will result in your patch being reverted." ;)

If you can think of a less snarky way of saying something along those lines, it'd be great. I'm more than a bit surprised the docs still talk about it at all, honestly. FileCheck has been the One True Way(™) for quite a while now.


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