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...nlined into function foo at: spectre.c:18:6 As it runs after inlining it must be ran at –O1 or above (recommendation is to run it at –O2). It's also enabled in the LTO pipeline so can detect cases of cross module inlining with -flto. The code is on phabricator: https://reviews.llvm.org/D43643 Paul Kocher (one of the researchers who wrote the Spectre paper) recently had a look at Microsoft’s /Qspectre flag: https://www.paulkocher.com/doc/MicrosoftCompilerSpectreMitigation.html Out of 15 examples Microsoft’s compiler was able to detect 2 (admittedly some of the examples are very h...