[CI] Downgrade to clang-20 for libc fullbuild

[krishna2803]

No description provided.

[llvmbot]

@llvm/pr-subscribers-github-workflow

Author: Krishna Pandey (krishna2803)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/150246.diff

1 Files Affected:

• (modified) .github/workflows/libc-fullbuild-tests.yml (+11-11)

diff --git a/.github/workflows/libc-fullbuild-tests.yml b/.github/workflows/libc-fullbuild-tests.yml
index 9b2d8dd579702..fe3dc50f6b9fc 100644
--- a/.github/workflows/libc-fullbuild-tests.yml
+++ b/.github/workflows/libc-fullbuild-tests.yml
@@ -21,37 +21,37 @@ jobs:
           - os: ubuntu-24.04
             build_type: Debug
             ccache-variant: sccache
-            c_compiler: clang-21
-            cpp_compiler: clang++-21
+            c_compiler: clang-20
+            cpp_compiler: clang++-20
             target: x86_64-unknown-linux-llvm
             include_scudo: ON
           - os: ubuntu-24.04
             build_type: Release
             ccache-variant: sccache
-            c_compiler: clang-21
-            cpp_compiler: clang++-21
+            c_compiler: clang-20
+            cpp_compiler: clang++-20
             target: x86_64-unknown-linux-llvm
             include_scudo: ON
           - os: ubuntu-24.04
             build_type: MinSizeRel
             ccache-variant: sccache
-            c_compiler: clang-21
-            cpp_compiler: clang++-21
+            c_compiler: clang-20
+            cpp_compiler: clang++-20
             target: x86_64-unknown-linux-llvm
             include_scudo: ON
           # TODO: remove ccache logic when https://github.com/hendrikmuhs/ccache-action/issues/279 is resolved.
           - os: ubuntu-24.04-arm
             build_type: Debug
             ccache-variant: ccache
-            c_compiler: clang-21
-            cpp_compiler: clang++-21
+            c_compiler: clang-20
+            cpp_compiler: clang++-20
             target: aarch64-unknown-linux-llvm
             include_scudo: ON
           - os: ubuntu-24.04
             build_type: Debug
             ccache-variant: ccache
-            c_compiler: clang-21
-            cpp_compiler: clang++-21
+            c_compiler: clang-20
+            cpp_compiler: clang++-20
             target: x86_64-unknown-uefi-llvm
             include_scudo: OFF
           # TODO: add back gcc build when it is fixed
@@ -81,7 +81,7 @@ jobs:
       run: |
         wget https://apt.llvm.org/llvm.sh
         chmod +x llvm.sh
-        sudo ./llvm.sh 21
+        sudo ./llvm.sh 20
         sudo apt-get update
         sudo apt-get install -y libmpfr-dev libgmp-dev libmpc-dev ninja-build linux-libc-dev
         sudo ln -sf /usr/include/$(uname -p)-linux-gnu/asm /usr/include/asm

[boomanaiden154]

I'm not sure this should be downgraded. If anything it should be upgraded to clang-22 (although it doesn't look like that exists yet according to llvm.sh).

The apt repo issue should be resolved soonish.

Really we probably need to use a container for the libc testing for increased stability.

[lntue]

Given that the LLVM libc full build pre-commit CI has been down for quite some time, and there is no apparent progress on the github issues, I'm going to approve downgrading to llvm-20 in the meantime to make these useful and reduce the noise.