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...to enable them and give them similar semantics to GCC. These flags are baked pretty deeply into our build environment, so supporting them at the driver level will make our lives a lot simpler. >From https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html: -fprofile-generate-fprofile-generate=pathEnable options usually used for instrumenting application to produce profile useful for later recompilation with profile feedback based optimization. You must use -fprofile-generate both when compiling and when linking your program. The following options are enabled: -fprofile-arcs, -fprofile-values,...