<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><div> <br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div class="gmail_quote"><div>So, why do you want to do that? What's your use case? :)</div></div></blockquote><div><br></div><div>does your answer mean that it is impossible to tell clang to load the ast instead of re-parsing re-syntactic-analyzing the source?<br></div><div class="gmail_extra">Well, could throw back the ball and ask, why being able to save ast at all?<br><br></div><div class="gmail_extra"><br></div><div>I use at this moment clang infra mainly to understand clang itself. I gave the Sema.cpp as example as it is probably the hugest file (absolute size not counting included headers). Probably with headers included lot of compilation unit would be almost equally large. Anyway the point is that compilation takes lot of time. Trying to understand how much potential is in a workflow where one would generate only once the ast, and subsequent processes would reuse the AST as mentioned earlier (code generation, static analysis etc, refactoring experiments). Well, for applying different optmisation strategies, the LLVM intermediate could play similar role.</div><div><br></div><div>As you can see, do not pretend to have a specific use case, but I also have the opinion that even simple features would never be asked explicitly as the threshold is a bit high, but these features would be probably used once present.</div><div><br></div><div><div class="gmail_extra">can you also eventually confirm that simple command line</div><div class="gmail_extra">clang Sema.ast<br></div><div class="gmail_extra">treats Sema.ast as pch and not as ast?<br></div></div><div><br></div><div><br></div><div>thanks and best regards</div><div>mobi phil</div></div>
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