[llvm-dev] Understanding the version handling in LLVM/Clang/LLD

[Sedat Dilek via llvm-dev]

On Wed, May 27, 2020 at 6:13 PM Sedat Dilek <sedat.dilek at gmail.com> wrote:
>
> I have downloaded the llvm-toolchain from [1]:
>
> dileks at iniza:~/src/llvm-toolchain/clang+llvm-10.0.1-rc1-x86_64-pc-linux-gnu/bin$
> ./clang-10 -v
> clang version 10.0.1 (https://github.com/llvm/llvm-project.git
> 01636c1eeace5371fef8508c7318df9d7a25b489)
> Target: x86_64-unknown-linux-gnu
> Thread model: posix
> InstalledDir: /home/dileks/src/llvm-toolchain/clang+llvm-10.0.1-rc1-x86_64-pc-linux-gnu/bin/.
> Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/10
> Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
> Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/9
> Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/10
> Candidate multilib: .;@m64
> Candidate multilib: 32;@m32
> Candidate multilib: x32;@mx32
> Selected multilib: .;@m64
>
> dileks at iniza:~/src/llvm-toolchain/clang+llvm-10.0.1-rc1-x86_64-pc-linux-gnu/bin$
> ./ld.lld -v
> LLD 10.0.1 (https://github.com/llvm/llvm-project.git
> 01636c1eeace5371fef8508c7318df9d7a25b489) (compatible with GNU
> linkers)
>
> What is that for a commit-hash-id?
>
> Even on master Git branch:
>
> $ git describe --contains 01636c1eeace5371fef8508c7318df9d7a25b489
> fatal: cannot describe '01636c1eeace5371fef8508c7318df9d7a25b489'
>
> $ git describe --contains f79cd71e145c6fd005ba4dd1238128dfa0dc2cb6
> llvmorg-10.0.1-rc1
>
> Last commit in release/10.x before llvmorg-10.0.1-rc1 was tagged:
> "[arm] Add big-endian version of pcrel fixups for adr instructions"
>
> Commit-hash-id of the tag?
>
> - Sedat -
>
> [1] https://github.com/llvm/llvm-project/releases/download/llvmorg-10.0.1-rc1/clang+llvm-10.0.1-rc1-x86_64-pc-linux-gnu.tar.xz
> [2] https://github.com/llvm/llvm-project/releases/download/llvmorg-10.0.1-rc1/clang+llvm-10.0.1-rc1-x86_64-pc-linux-gnu.tar.xz.sig
> [3] https://github.com/llvm/llvm-project/commit/f79cd71e145c6fd005ba4dd1238128dfa0dc2cb6

Hmm,

$ git show-ref --tags | grep 10.0.1-rc1
f79cd71e145c6fd005ba4dd1238128dfa0dc2cb6 refs/tags/llvmorg-10.0.1-rc1

$ ./clang-10 -v | grep Target
clang version 10.0.1 (https://github.com/llvm/llvm-project.git
01636c1eeace5371fef8508c7318df9d7a25b489)
Target: x86_64-unknown-linux-gnu

The tarball name says
clang+llvm-10.0.1-rc1-***x86_64-pc-linux-gnu***.tar.xz but it's
"Target: x86_64-unknown-linux-gnu".

- Sedat -