[PATCH] D73307: Unique Names for Functions with Internal Linkage

Mon Apr 6 14:10:45 PDT 2020

hubert.reinterpretcast added inline comments.

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Comment at: clang/docs/UsersManual.rst:1684
+   linkage symbols. The unique name is obtained by appending the hash of the
+   full module name to the original symbol. This option is particularly useful
+   in attributing profile information to the correct function when multiple
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MaskRay wrote:
> rnk wrote:
> > I think it's important to be specific here. I'd go so far as to say:
> > "When this option is set, compiler hashes the main source file path from the command line and appends it to all internal symbols. If a program contains multiple objects compiled from the same source file path, the symbols are not guaranteed to be unique."
> Should option like -ffile-prefix-map= affect the hashed source file path? I suspect it already does this but I haven't verified.
> 
> This may need tests for Windows and non-Windows, similar to D77223.
With respect to @rnk's suggestion, "from the same source file path" implies the same file. I would suggest saying "with the same command-line source file specification".

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D73307/new/

https://reviews.llvm.org/D73307