[llvm] [CI][Github] Install Clang in Windows container (PR #164519)
via llvm-commits
llvm-commits at lists.llvm.org
Thu Oct 23 07:49:33 PDT 2025
https://github.com/cmtice updated https://github.com/llvm/llvm-project/pull/164519
>From 8dc19da49d9477e979405a5038edd67338f72dae Mon Sep 17 00:00:00 2001
From: Caroline Tice <cmtice at google.com>
Date: Tue, 21 Oct 2025 16:20:18 -0700
Subject: [PATCH 1/2] [CI][Github] Install Clang in Windows container
Downloads clang-for-windows from the LLVM releases website,
decompresses and untars the images, and leave them in
C:\clang\clang-msvc\... Temporarily downloads the 'xz' utility
to decompress the downloaded clang tarball image.
---
.../github-action-ci-windows/Dockerfile | 34 +++++++++++++++++++
1 file changed, 34 insertions(+)
diff --git a/.github/workflows/containers/github-action-ci-windows/Dockerfile b/.github/workflows/containers/github-action-ci-windows/Dockerfile
index 9ddf5017bc020..7835cc07a3936 100644
--- a/.github/workflows/containers/github-action-ci-windows/Dockerfile
+++ b/.github/workflows/containers/github-action-ci-windows/Dockerfile
@@ -98,3 +98,37 @@ RUN powershell -Command \
Add-Type -AssemblyName System.IO.Compression.FileSystem ; \
[System.IO.Compression.ZipFile]::ExtractToDirectory('actions-runner-win.zip', $PWD) ;\
rm actions-runner-win.zip
+
+# Download and extract Clang compiler.
+# Create directories, download, extract, and clean up all in one layer
+RUN powershell -Command \
+ # --- Setup directories --- \
+ Write-Host "Creating directories..."; \
+ New-Item -Path "C:\temp-download" -ItemType "Directory" -Force ; \
+ New-Item -Path "C:\xz-utils" -ItemType "Directory" -Force ; \
+ New-Item -Path "C:\clang" -ItemType "Directory" -Force ; \
+ # --- 1. Download and extract xz --- \
+ Set-Location C:\temp-download ; \
+ Write-Host "Downloading xz-utils..."; \
+ Invoke-WebRequest -Uri "http://github.com/tukaani-project/xz/releases/download/v5.8.1/xz-5.8.1-windows.zip" -OutFile "xz.zip"; \
+ Write-Host "Extracting xz-utils..."; \
+ Add-Type -AssemblyName "System.IO.Compression.FileSystem"; \
+ [System.IO.Compression.ZipFile]::ExtractToDirectory('C:\temp-download\xz.zip', 'C:\xz-utils'); \
+ # --- 2. Download and decompress Clang --- \
+ Write-Host "Downloading Clang..."; \
+ Invoke-WebRequest -Uri "http://github.com/llvm/llvm-project/releases/download/llvmorg-21.1.2/clang+llvm-21.1.2-x86_64-pc-windows-msvc.tar.xz" -OutFile "clang+llvm-21.1.2-x86_64-pc-windows-msvc.tar.xz" ; \
+ Write-Host "Decompressing clang.tar.xz using C:\xz-utils\bin_x86-64\xz.exe"; \
+ C:\xz-utils\bin_x86-64\xz.exe -d -qq clang+llvm-21.1.2-x86_64-pc-windows-msvc.tar.xz ; \
+ # --- 3. Extract clang --- \
+ Write-Host "Extracting clang.tar to C:\clang ..."; \
+ C:\Windows\System32\tar.exe -xf clang+llvm-21.1.2-x86_64-pc-windows-msvc.tar -C C:\clang ; \
+ # --- 4. Clean up --- \
+ Write-Host "Cleaning up..." ; \
+ Set-Location C:\ ; \
+ Remove-Item C:\temp-download -Recurse -Force; \
+ Remove-Item C:\xz-utils -Recurse -Force; \
+ Write-Host "Download and extraction complete." ;
+
+RUN powershell -Command \
+ Set-Location C:\clang ; \
+ Rename-Item -Path "C:\clang\clang+llvm-21.1.2-x86_64-pc-windows-msvc" -NewName "C:\clang\clang-msvc" ;
>From dfc18987def3c70755afebb82d93b74a9eb788d7 Mon Sep 17 00:00:00 2001
From: Caroline Tice <cmtice at google.com>
Date: Thu, 23 Oct 2025 07:48:09 -0700
Subject: [PATCH 2/2] Address some reviewer comments: - Remove "Write-Host"
lines - Add LLVM_VERSION environment variable - Remove unnecessary
files from downloaded clang
---
.../github-action-ci-windows/Dockerfile | 24 ++++++++++++-------
1 file changed, 16 insertions(+), 8 deletions(-)
diff --git a/.github/workflows/containers/github-action-ci-windows/Dockerfile b/.github/workflows/containers/github-action-ci-windows/Dockerfile
index 7835cc07a3936..964bdcaac275d 100644
--- a/.github/workflows/containers/github-action-ci-windows/Dockerfile
+++ b/.github/workflows/containers/github-action-ci-windows/Dockerfile
@@ -99,6 +99,9 @@ RUN powershell -Command \
[System.IO.Compression.ZipFile]::ExtractToDirectory('actions-runner-win.zip', $PWD) ;\
rm actions-runner-win.zip
+# Set the LLVM_VERSION environment variable
+RUN powershell -Command [Environment]::SetEnvironmentVariable('LLVM_VERSION', '21.1.2', 'Machine')
+
# Download and extract Clang compiler.
# Create directories, download, extract, and clean up all in one layer
RUN powershell -Command \
@@ -109,26 +112,31 @@ RUN powershell -Command \
New-Item -Path "C:\clang" -ItemType "Directory" -Force ; \
# --- 1. Download and extract xz --- \
Set-Location C:\temp-download ; \
- Write-Host "Downloading xz-utils..."; \
Invoke-WebRequest -Uri "http://github.com/tukaani-project/xz/releases/download/v5.8.1/xz-5.8.1-windows.zip" -OutFile "xz.zip"; \
- Write-Host "Extracting xz-utils..."; \
Add-Type -AssemblyName "System.IO.Compression.FileSystem"; \
[System.IO.Compression.ZipFile]::ExtractToDirectory('C:\temp-download\xz.zip', 'C:\xz-utils'); \
# --- 2. Download and decompress Clang --- \
- Write-Host "Downloading Clang..."; \
Invoke-WebRequest -Uri "http://github.com/llvm/llvm-project/releases/download/llvmorg-21.1.2/clang+llvm-21.1.2-x86_64-pc-windows-msvc.tar.xz" -OutFile "clang+llvm-21.1.2-x86_64-pc-windows-msvc.tar.xz" ; \
- Write-Host "Decompressing clang.tar.xz using C:\xz-utils\bin_x86-64\xz.exe"; \
C:\xz-utils\bin_x86-64\xz.exe -d -qq clang+llvm-21.1.2-x86_64-pc-windows-msvc.tar.xz ; \
# --- 3. Extract clang --- \
- Write-Host "Extracting clang.tar to C:\clang ..."; \
C:\Windows\System32\tar.exe -xf clang+llvm-21.1.2-x86_64-pc-windows-msvc.tar -C C:\clang ; \
# --- 4. Clean up --- \
- Write-Host "Cleaning up..." ; \
Set-Location C:\ ; \
Remove-Item C:\temp-download -Recurse -Force; \
Remove-Item C:\xz-utils -Recurse -Force; \
- Write-Host "Download and extraction complete." ;
+# Shorten path to clang files.
RUN powershell -Command \
Set-Location C:\clang ; \
- Rename-Item -Path "C:\clang\clang+llvm-21.1.2-x86_64-pc-windows-msvc" -NewName "C:\clang\clang-msvc" ;
+ Rename-Item -Path "C:\clang\clang+llvm-21.1.2-x86_64-pc-windows-msvc" -NewName "C:\clang\clang-msvc" ; \
+ Set-Location C:\clang\clang-msvc ; \
+ Remove-Item -Path C:\clang\clang-msvc\libexec -Recurse -Force ; \
+ Remove-Item -Path C:\clang\clang-msvc\share -Recurse -Force ; \
+ Rename-Item -Path "C:\clang\clang-msvc\bin" -NewName "C:\clang\clang-msvc\bin-full" ; \
+ New-Item -Path "C:\clang\clang-msvc\bin" -ItemType Directory -Force ; \
+ Set-Location C:\clang\clang-msvc\bin ; \
+ Copy-Item -Path C:\clang\clang-msvc\bin-full\*.dll -Destination C:\clang\clang-msvc\bin\. ; \
+ Copy-Item -Path C:\clang\clang-msvc\bin-full\clang-cl.exe -Destination C:\clang\clang-msvc\bin\. ; \
+ Copy-Item -Path C:\clang\clang-msvc\bin-full\lld-link.exe -Destination C:\clang\clang-msvc\bin\. ; \
+ Set-Location C:\clang\clang-msvc ; \
+ Remove-Item -Path C:\clang\clang-msvc\bin-full -Recurse -Force ;
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