[PATCH] D82994: [RFC] Instrumenting Clang/LLVM with Perfetto

[Nick Desaulniers via Phabricator via llvm-commits]

nickdesaulniers added inline comments.


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Comment at: llvm/cmake/modules/AddPerfetto.cmake:9
+  ExternalProject_Add(perfetto_git
+      GIT_REPOSITORY https://github.com/google/perfetto.git
+      GIT_TAG releases/v4.x
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lebedev.ri wrote:
> nickdesaulniers wrote:
> > lebedev.ri wrote:
> > > I have concerns about this.
> > > It really should use system-provided version via `find_package()`
> > > At worst, the sources should be bundled into the tree like it's already done in some rare cases.
> > Not that I'm very good with CMake, but this seems to suggest that `ExternalProject_Add` may not compose well with `find_package`: https://stackoverflow.com/questions/6351609/cmake-linking-to-library-downloaded-from-externalproject-add
> What i am saying is that any code that fetches anything from internet during cmake/build time is just plain broken.
> perfetto should be provided by system package and we should link to it just like we link to zlib/etc.
That's how GTest is fetched.  See: llvm/utils/benchmark/cmake/HandleGTest.cmake.


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