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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Alright, I guess it isn’t just my pain then, it makes it feel better
</span><span style="font-size:11.0pt;font-family:Wingdings;color:#1F497D">J</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> I think that proposed feature would be really nice, since it would encourage people to write tests
that have a //CHECK: some-thing-after-header first!<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Reid Kleckner [mailto:rnk@google.com]
<br>
<b>Sent:</b> Thursday, March 30, 2017 11:15 AM<br>
<b>To:</b> Keane, Erich <erich.keane@intel.com><br>
<b>Cc:</b> llvm-dev@lists.llvm.org<br>
<b>Subject:</b> Re: [llvm-dev] FileCheck feature request- by default ignore IR-"headers"<o:p></o:p></span></p>
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<p class="MsoNormal">Yeah, this is a documented shortcoming of FileCheck:<o:p></o:p></p>
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<p class="MsoNormal"><a href="http://llvm.org/docs/TestingGuide.html#fragile-tests">http://llvm.org/docs/TestingGuide.html#fragile-tests</a><o:p></o:p></p>
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<p class="MsoNormal">I think the most practical thing to do would be to make FileCheck reject test cases that consist only CHECK-NOT directives, unless a flag is passed to disable this behavior.<o:p></o:p></p>
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<p class="MsoNormal">On Thu, Mar 30, 2017 at 8:57 AM, Keane, Erich via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">Hi all-<br>
I hope this is the right place for this.<br>
<br>
Anyway, the primary usage for the utility "FileCheck" is to pattern match for specific values in a stream. This is perfectly consistent and deterministic for the most part! However, when validating clang's LLVM-IR generation, it is possible to make an invalid
match against the top few generated lines (the LLVM-IR Headers), which are inconsistent.<br>
<br>
For example (from my personal pain), we have a test: clang/test/CodeGen/debug-info-macro.c that has a 'check-not' on the word "macros". Unfortunately, my SVN workspace name was "ms_macros", which gave me a false match. I'm a bit ashamed to say how long this
took me to figure out :)<br>
<br>
Anywya, to my feature request: to prevent someone else from going through this pain again, would it be possible to have FileCheck ignore these first 4 lines as default behavior? I suspect there might be a few tests that would want to validate those headers,
though I expect those are the vast minority, so I would think this should be opt in.<br>
<br>
-Erich<br>
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