LibTooling Tutorial directory paths

Clang Frontend
1

I’m trying to work through the “Create a ClangTool” tutorial at https://clang.llvm.org/docs/LibASTMatchersTutorial.html

The instructions include “cd ~/clang-llvm/llvm/tools/clang”, but this directory does not exist within the tree that’s generated from the previous stages. “~/clang-llvm/llvm/tools/” is there.

Various other commands also depend on similar paths.

Where should the loop-convert directory be placed?

Thanks

Phil.

2

Hi Phil,

Use ~/clang-llvm/clang instead of ~/clang-llvm/tools/clang, and put the new tool in ~/clang-llvm/clang-tools-extra instead of ~/clang-llvm/tools/clang/tools/extra.
LLVM has two supported directory layouts and the tutorial was only partially updated to use the new monorepo layout.

3

Thanks for the clarification.

I’ve tried putting the files in ~/clang-llvm/clang-tool-extra/loop-convert and adding add_subdirectory(loop-convert) to ~/clang-llvm/clang-tool-extra/CMakeLists.txt.

However, I think there must be something else I need to do as a “make” does not result in anything new being built!

Do I need to pass -DLLVM_ENABLE_PROJECTS= to cmake?

Phil.

Hi Phil,

Use ~/clang-llvm/clang instead of ~/clang-llvm/tools/clang, and put the new tool in ~/clang-llvm/clang-tools-extra instead of ~/clang-llvm/tools/clang/tools/extra.
LLVM has two supported directory layouts and the tutorial was only partially updated to use the new monorepo layout.

4

Ah, yes, this changed as well after writing this documentation… You need to pass ‘-DLLVM_ENABLE_PROJECTS=clang;clang-tools-extra’.
I’ll update the docs accordingly.

5

Thanks, that’s got it going.

Phil.

Ah, yes, this changed as well after writing this documentation… You need to pass ‘-DLLVM_ENABLE_PROJECTS=clang;clang-tools-extra’.
I’ll update the docs accordingly.