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<p class="MsoNormal"><span lang="EN-US">Hello,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I’ve made some progress in that direction, but I’m not done yet, and I have some hard time putting it all together, so I’m thinking I may be missing something obvious. So I’d like to describe what I’ve done so far:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoNormal" style="margin-left:0cm;mso-list:l2 level1 lfo4"><span lang="EN-US">I gave up using a
</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:#2B91AF;mso-fareast-language:FR">ClangTool
</span><span lang="EN-US">to run the preprocessing step, it just did not work. Instead, I’m creating a
</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:#2B91AF;mso-fareast-language:FR">CompilerInvocation</span><span lang="EN-US"> and pass it to a custom
</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:#2B91AF;mso-fareast-language:FR">FrontendActionFactory</span><span lang="EN-US"> that returns a
</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:#2B91AF;mso-fareast-language:FR">GeneratePCHAction</span><span lang="EN-US">.<o:p></o:p></span></li><li class="MsoNormal" style="margin-left:0cm;mso-list:l2 level1 lfo4"><span lang="EN-US">This sort of works (assuming I pass to the
</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:#2B91AF;mso-fareast-language:FR">CompilerInvocation</span><span lang="EN-US"> all the arguments equivalent to the ones I pass to the
</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:#2B91AF;mso-fareast-language:FR">ClangTool</span><span lang="EN-US"> that I use later). But then, when I have any error in the PCH code, the PCH is not saved on disk (for what I do,
I really don’t mind having incomplete results, so I’d like to save it anyway)<o:p></o:p></span></li><li class="MsoNormal" style="margin-left:0cm;mso-list:l2 level1 lfo4"><span lang="EN-US">So I created a new action that inherits from
</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:#2B91AF;mso-fareast-language:FR">GeneratePCHAction</span><span lang="EN-US"> but in
</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black;mso-fareast-language:FR">CreateASTConsumer</span><span lang="EN-US"> has the same code as its base class, but uses true instead of false for the argument
</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:green;mso-fareast-language:FR">AllowASTWithErrors</span><span lang="EN-US"> of the
</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:#2B91AF;mso-fareast-language:FR">PCHGenerator</span><span lang="EN-US"> constructor. But still, the PCH file does not get generated in case of errors.<o:p></o:p></span></li></ul>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Do you think I’m going in the right direction? Do you have any idea what I should do to achieve my goal?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I’ve got another question: Many tooling function have a
</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:#2B91AF;mso-fareast-language:FR">shared_ptr</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black;mso-fareast-language:FR"><</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:#2B91AF;mso-fareast-language:FR">PCHContainerOperations</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black;mso-fareast-language:FR">></span><span lang="EN-US">
argument. Does it mean I could use a PCH in memory without ever saving it to the disk, or is if just to be used for modules, as the documentation seems to imply? Do you have any hint about how this can be used?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thank you!<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">--- <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Loïc Joly<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><a name="_MailEndCompose"><o:p> </o:p></a></p>
<span style="mso-bookmark:_MailEndCompose"></span>
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<p class="MsoNormal"><b><span style="mso-fareast-language:FR">De :</span></b><span style="mso-fareast-language:FR"> cfe-dev [mailto:cfe-dev-bounces@lists.llvm.org]
<b>De la part de</b> Loïc Joly via cfe-dev<br>
<b>Envoyé :</b> lundi 7 août 2017 20:39<br>
<b>À :</b> cfe-dev@lists.llvm.org<br>
<b>Objet :</b> [cfe-dev] Using precompiled headers with libtooling?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hello,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">We are using clang libtooling, and we think about enabling precompiled headers to speed-up our processing, but I’ve not found any document about that, so I have a few questions:<o:p></o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoNormal" style="margin-left:0cm;mso-list:l0 level1 lfo3"><span lang="EN-US">If we do so, will the content of the pch be visited with a RecursiveASTVisitor? With an ast matcher?<o:p></o:p></span></li><li class="MsoNormal" style="margin-left:0cm;mso-list:l0 level1 lfo3"><span lang="EN-US">Will code location inside the PCH refer to the files that generated the pch?<o:p></o:p></span></li><li class="MsoNormal" style="margin-left:0cm;mso-list:l0 level1 lfo3"><span lang="EN-US">Are there any other caveat?<o:p></o:p></span></li><li class="MsoNormal" style="margin-left:0cm;mso-list:l0 level1 lfo3"><span lang="EN-US">Is there a tool to generate the pch with an interface similar to ClangTool, or should I just spawn a sub process the create the pch before starting the tool?<o:p></o:p></span></li></ul>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thank you for your help,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">--- <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Loïc Joly<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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