[cfe-dev] Absolute paths in code coverage info

Keith Smiley via cfe-dev cfe-dev at lists.llvm.org
Tue Jun 2 14:27:19 PDT 2020

Thanks for the context! I found the revert
it looks like it was caused by a small test issue. I'm a bit surprised by
the justification for it since I would expect relying on the specific
directory of the test to be safe, but I think I can make it work and
Keith Smiley

On Tue, Jun 2, 2020 at 10:44 AM Vedant Kumar <vsk at apple.com> wrote:

> A problem that absolute paths solve in local builds is dealing with a
> changing compilation directory - this can result in two different files
> being referenced by the same relative path.
> There was a promising attempt to make this work with remote builds. The
> idea was to have the coverage mapping logic respect a fixed compilation
> directory option (https://reviews.llvm.org/D68733), i.e. the paths
> embedded in the coverage mapping should be rooted at the
> -fdebug-compilation-dir <path>. It looks like the patch was reverted, but
> (as far as I know) there aren’t any fundamental issues with it.
> On Jun 2, 2020, at 9:57 AM, Keith Smiley via cfe-dev <
> cfe-dev at lists.llvm.org> wrote:
> Hey everyone,
> Currently when generating code coverage by passing
> `-fprofile-instr-generate -fcoverage-mapping` to clang, the __LLVM_COV /
> __llvm_covmap section ends up containing absolute paths to the source files
> being compiled. This causes issues when producing coverage info with remote
> builds where the absolute paths to the source files may differ between
> machines.
> llvm-cov has a `-path-equivalence` flag in order for you to remap a single
> absolute path from the coverage info which definitely helps, but it doesn't
> solve this entirely for the cases where you have multiple paths that need
> remapping, or you're using another tool such as, Xcode's code coverage UI,
> that doesn't support this kind of path remapping.
> I'm wondering if it has been discussed, or how feasible it would be, for
> me to remove the necessity for absolute paths in this info.
> Thanks!
> --
> Keith Smiley
> _______________________________________________
> cfe-dev mailing list
> cfe-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/cfe-dev/attachments/20200602/89bc1d66/attachment-0001.html>

More information about the cfe-dev mailing list