<div dir="ltr"><div dir="ltr"><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Aug 19, 2019 at 8:34 AM Jon Chesterfield via cfe-dev <<a href="mailto:cfe-dev@lists.llvm.org">cfe-dev@lists.llvm.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hello Clang,<div><br></div><div>There's a proposal in SG15 (<a href="http://wg21.link/p1832" target="_blank">http://wg21.link/p1832</a>) with a suggestion to more aggressively inline functions included via isystem when building for -Og. </div></div></blockquote><div><br>To me that sounds pretty outside the scope of the C++ standards committee, but don't know too much about how they deal with things on the fringe like this. It would seem simpler/more direct to provide patches/discuss development in existing compilers to demonstrate the value and leave it up to "market forces" to handle this sort of quality-of-implementation thing.<br> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>The goal is to improve runtime performance for debug builds that make heavy use of the STL.</div><div><br></div><div>Does clang already set various attributes based on whether a function was found via -i or -isystem, and if not, does that seem a reasonable extension?</div></div></blockquote><div><br>Nope - pretty sure it doesn't & probably tries fairly hard not to vary code generation (or even diagnostics, except for a very big slice around system headers specifically to avoid warnings users can't fix) depending on where the code was written.<br><br>There is work in Clang/LLVM to try to make -Og/-O1 (currently synonymous and hope to keep them that way as long as possible) be a good/better fast/debuggable tradeoff. But mostly that centers around avoiding destructive optimizations & keeping as much debug-ability-related state as possible.<br><br>- Dave<br> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div><br></div><div>Thanks,</div><div><br></div><div>Jon</div></div>
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