beanz added inline comments.
================
Comment at: clang/tools/.gitignore:12
+#==============================================================================#
+# The include-what-you-use project, for when building in-tree.
+include-what-you-use
----------------
rnk wrote:
> LLVM doesn't currently have any .gitignore files for other projects, and they
> don't show up in `git status`. What's the difference here?
We actually should put this into the clang/.gitignore instead of a separate
.gitignore in the tools directory. That is how we've done things in LLVM &
Clang before.
================
Comment at: clang/tools/CMakeLists.txt:35
+# if include-what-you-use is cloned for building in-tree, add it here.
+if (EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/include-what-you-use")
+ add_clang_subdirectory(include-what-you-use)
----------------
rnk wrote:
> Maybe we should do `llvm_add_implicit_projects(CLANG)` here instead?
>
> Or do we not want clang/tools to be a project extension point? Would IWYU
> build fine if we added it to llvm/projects or llvm/tools? Maybe we should
> just recommend that.
Either `llvm_add_implicit_projects(CLANG)` or
`add_llvm_external_project(include-what-you-use include-what-you-use)`.
The former case would make this a generic extension point, which I think is
good, the later would add just this project without needing to wrap it in an
`if`.
I would prefer going the implicit route because I actually have a distaste for
having code living in-tree that is specifically for supporting out-of-tree code.
https://reviews.llvm.org/D31696
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