[libcxx-commits] [libcxx] [llvm] [libc++][CI] Upgrade compiler HEAD version to Clang-20 (PR #108761)

[Robin Caloudis via libcxx-commits]

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@@ -38,11 +38,11 @@ env:
   # LLVM POST-BRANCH bump version
   # LLVM POST-BRANCH add compiler test for ToT - 1, e.g. "Clang 17"
   # LLVM RELEASE bump remove compiler ToT - 3, e.g. "Clang 15"
-  LLVM_HEAD_VERSION: "19"   # Used compiler, update POST-BRANCH.
-  LLVM_PREVIOUS_VERSION: "18"
-  LLVM_OLDEST_VERSION: "17"
+  LLVM_HEAD_VERSION: "20"   # Used compiler, update POST-BRANCH.
+  LLVM_PREVIOUS_VERSION: "19"
+  LLVM_OLDEST_VERSION: "18"
   GCC_STABLE_VERSION: "13"
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robincaloudis wrote:

Thanks for pointing out! This env variable might be unused. It seems to me that the actual version for gcc is configured [here](https://github.com/llvm/llvm-project/blob/main/libcxx/utils/ci/docker-compose.yml#L4). I will double check my claim.

https://github.com/llvm/llvm-project/pull/108761