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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">This is actually something I’ve talked about quite a bit lately internally. If this were a few years ago before we implemented __PRETTY_FUNCTION__, I definitely
would have been in the camp of matching GCC’s behavior. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">However, my current opinion (which is only my own), is that we shouldn’t mess with it. There are a couple of libraries that depend on the format to be as it
is. There is a boost library that slips my mind at the moment that does a ton of template magic based on the format of __PRETTY_FUNCTION__ that would be broken and have to be conditionalized. I would fear breaking them again.<o:p></o:p></span></p>
<p class="MsoNormal"><a name="_MailEndCompose"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></a></p>
<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"> cfe-dev [mailto:cfe-dev-bounces@lists.llvm.org]
<b>On Behalf Of </b>Mikhail Ramalho via cfe-dev<br>
<b>Sent:</b> Thursday, February 1, 2018 9:50 AM<br>
<b>To:</b> Mikhail Ramalho via cfe-dev <cfe-dev@lists.llvm.org><br>
<b>Subject:</b> [cfe-dev] __PRETTY_FUNCTION__ in clang<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi all,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I recently noticed that clang and gcc print __PRETTY_FUNCTION__ in different formats, e.g.:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">template <typename T> struct X<o:p></o:p></p>
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<p class="MsoNormal">{<o:p></o:p></p>
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<p class="MsoNormal"> X() { std::cout << __PRETTY_FUNCTION__ << '\n';}<o:p></o:p></p>
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<p class="MsoNormal">};<o:p></o:p></p>
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<p class="MsoNormal">X<void> x;<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">In gcc:<o:p></o:p></p>
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<p class="MsoNormal">X<T>::X() [with T = void]<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">In clang:<o:p></o:p></p>
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<p class="MsoNormal">X<void>::X() [T = void]<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I only found a discussion about it from 2011, that added the template args to the output:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><a href="http://clang-developers.42468.n3.nabble.com/clang-and-gcc-implement-PRETTY-FUNCTION-differently-td3550386.html">http://clang-developers.42468.n3.nabble.com/clang-and-gcc-implement-PRETTY-FUNCTION-differently-td3550386.html</a><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I also created a patch that implements the gcc format, but broke all the diagnostic tests, because it needs the instantiated name to report warning/errors (which is correct in my opinion). <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">One solution would be adding a new attribute in PrintingPolicy to handle the case where we want to print these predefined expressions, then enabling it in PredefinedExpr::ComputeName.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#222222;background:white">Is there any interest in the community to match gcc's output? There are some valid points in the previous thread.</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#222222;background:white">Thank you,</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">-- <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Mikhail Ramalho.<o:p></o:p></p>
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