[PATCH] D109977: LLVM Driver Multicall tool

[Fangrui Song via Phabricator via cfe-commits]

MaskRay added a comment.

In D109977#3660734 <https://reviews.llvm.org/D109977#3660734>, @mgorny wrote:

> In D109977#3660006 <https://reviews.llvm.org/D109977#3660006>, @abrachet wrote:
>
>> In D109977#3652467 <https://reviews.llvm.org/D109977#3652467>, @mgorny wrote:
>>
>>> Though I can reproduce it with much shorter:
>>>
>>>   mkdir build
>>>   cd build
>>>   cmake ../clang -G Ninja
>>>
>>> (matching installed version of LLVM 15 must be on PATH)
>>
>> Are you sure it should be in PATH? I have added installed LLVM from ToT to a directory, put that in path yet CMake still finds /usr/lib/llvm-13/cmake/AddLLVM.cmake instead. I can't find any documentation on the standalone build, unfortunately.
>
> I'm sorry, what does "ToT" mean here? Also, what's `i`? Perhaps it's picking it up from some other variable. In my case, it's finding the installed LLVM 14 because that's the first PATH entry. Note that CMake looks into `../lib*/cmake` and `../share/cmake` relative to PATH entries. FWICS it also looks at `CMAKE_MODULE_PATH`.

"Top of Trunk" (or tree?) which indicates the latest commit of origin/main . "Trunk" was a term inherited from the old subversion days.

Debian installs different llvm packages to `/usr/lib/llvm-*`:

  % ls /usr/lib/llvm-* 
  /usr/lib/llvm-11:
  bin/  build/  cmake@  include/  lib/  share/
  
  /usr/lib/llvm-13:
  bin/  build/  cmake@  include/  lib/  share/
  
  /usr/lib/llvm-9:
  bin/  build/  cmake@  include/  lib/  share/

For downstream reports (e.g. Debian, Gentoo), it is worth stripping the distribution specific knowledge so that a patch author doesn't need to install a particular distribution to reproduce an issue.


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https://reviews.llvm.org/D109977