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

[Nico Weber via Phabricator via llvm-commits]

thakis added a comment.
Herald added a subscriber: ormris.

Hi,

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?

Part of why I'm asking is because I'm trying to teach lld/mac about `section$start$` symbols, but with a candidate patch I'm still getting `undefined symbol: section$start$__DATA$__llvm_orderfile`. It's well possible my patch is wrong, but I don't see what's supposed to create the `__llvm_orderfile` section (https://bugs.chromium.org/p/chromium/issues/detail?id=1220128#c10 has the candidate patch).

Thanks,
Nico


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  rL LLVM

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https://reviews.llvm.org/D57463