[PATCH] D57463: Add a module pass for order file instrumentation

[Nico Weber via Phabricator via llvm-commits]

thakis added a comment.

> is there any documentation on how to use this? I see that clang has a `-forder-file-instrumentation` switch to enable this. But what do I do after I enabled it? Run the instrumented program and then…? From the name, I'm guessing maybe the idea is that this will produce an order file?

Looks like `compiler-rt/test/profile/instrprof-order-file.test` gives a demo for how this is supposed to be used: `clang -forder-file-instrumentation -O1 compiler-rt/test/profile/Inputs/instrprof-order-file-2.c compiler-rt/test/profile/Inputs/instrprof-order-file.c -mllvm -orderfile-write-mapping="mapping.txt"`, i.e. it needs an `-mllvm` flag to make it have an effect.


Repository:
  rL LLVM

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  https://reviews.llvm.org/D57463/new/

https://reviews.llvm.org/D57463