[cfe-dev] Varying per function optimisation based on include path?

[Jon Chesterfield via cfe-dev]

Hello Clang,

There's a proposal in SG15 (http://wg21.link/p1832) with a suggestion to
more aggressively inline functions included via isystem when building for
-Og. The goal is to improve runtime performance for debug builds that make
heavy use of the STL.

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?

Thanks,

Jon
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