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Add Windows Clang workflow to nightly matrix #21630

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5d83cbe
add clang-cl to windows nightly CI
henderkes Apr 4, 2026
5cc836e
run clang on "CI: Windows" label too
henderkes Apr 4, 2026
9f51aab
feedback
henderkes Apr 4, 2026
17b8485
only for 8.5+ I guess
henderkes Apr 4, 2026
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14 changes: 10 additions & 4 deletions .github/matrix.php
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Original file line number Diff line number Diff line change
Expand Up @@ -144,12 +144,18 @@ function select_jobs($repository, $trigger, $nightly, $labels, $php_version, $re
$jobs['SOLARIS'] = true;
}
if ($all_jobs || !$no_jobs || $test_windows) {
$jobs['WINDOWS']['matrix'] = $all_variations
? ['include' => [
$windows_include = $all_variations
? [
['asan' => true, 'opcache' => true, 'x64' => true, 'zts' => true],
['asan' => false, 'opcache' => false, 'x64' => false, 'zts' => false],
]]
: ['include' => [['asan' => false, 'opcache' => true, 'x64' => true, 'zts' => true]]];
]
: [
['asan' => false, 'opcache' => true, 'x64' => true, 'zts' => true],
];
if ($all_variations || $test_windows) {
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@iluuu1994 iluuu1994 Apr 4, 2026

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To stay consistent with the other jobs, this should be enabled only with $all_variations but not with $test_windows.

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@henderkes henderkes Apr 4, 2026 •
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I would like there to be a simple path to testing windows+clang. Generally every change affecting Windows should work on both MSVC and Clang. Would you be open to a different label instead?

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@iluuu1994 iluuu1994 Apr 4, 2026

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What's the intention of the label? To run the Window+Clang build only without running the other Windows builds?

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@henderkes henderkes Apr 4, 2026

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Thinking about it again, a new label doesn't make sense. I just believe Clang should always be tested and eventually become the default. It's just producing so much faster binaries.

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@iluuu1994 iluuu1994 Apr 4, 2026

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Ok. Please make the changes as suggested for now. We can reconsider enabling it by-default if they become the default. I doubt Clang builds on Windows are in wide use atm. If you push with the suggested changes, the job should run.

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@iluuu1994 iluuu1994 Apr 4, 2026

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Oh sorry, I see that you already made this change. I'll see how we should proceed.

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@henderkes henderkes Apr 4, 2026 •
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Already done as suggested

if the windows team doesn't want to switch to clang for 8.6 yet, we might ship clang builds with FrankenPHP as an alternative build. If it were 10% performance there'd be no reason, but +60-90% faster is just hard to ignore. No enhancement we could ever do to FrankenPHP itself could offer that much extra performance

$windows_include[] = ['asan' => false, 'opcache' => true, 'x64' => true, 'zts' => true, 'clang' => true];
}
$jobs['WINDOWS']['matrix'] = ['include' => $windows_include];
$jobs['WINDOWS']['config'] = version_compare($php_version, '8.4', '>=')
? ['vs_crt_version' => 'vs17']
: ['vs_crt_version' => 'vs16'];
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4 changes: 4 additions & 0 deletions .github/scripts/windows/build_task.bat
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Expand Up @@ -30,10 +30,14 @@ if %errorlevel% neq 0 exit /b 3

if "%THREAD_SAFE%" equ "0" set ADD_CONF=%ADD_CONF% --disable-zts
if "%INTRINSICS%" neq "" set ADD_CONF=%ADD_CONF% --enable-native-intrinsics=%INTRINSICS%
if "%CLANG_TOOLSET%" equ "1" set ADD_CONF=%ADD_CONF% --with-toolset=clang

rem Some undefined behavior is reported on 32-bit, this should be fixed
if "%PLATFORM%" == "x86" (
set CFLAGS=/W1
) else if "%CLANG_TOOLSET%" equ "1" (
rem Clang is much stricter than MSVC, produces too many warnings that would fail the build with /WX
set CFLAGS=/W1
) else (
set CFLAGS=/W1 /WX
)
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3 changes: 2 additions & 1 deletion .github/workflows/test-suite.yml
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Expand Up @@ -935,7 +935,7 @@ jobs:
strategy:
fail-fast: false
matrix: ${{ fromJson(inputs.branch).jobs.WINDOWS.matrix }}
name: "WINDOWS_${{ matrix.x64 && 'X64' || 'X86' }}_${{ matrix.zts && 'ZTS' || 'NTS' }}${{ matrix.asan && '_ASAN' || ''}}"
name: "WINDOWS_${{ matrix.x64 && 'X64' || 'X86' }}_${{ matrix.zts && 'ZTS' || 'NTS' }}${{ matrix.asan && '_ASAN' || ''}}${{ matrix.clang && '_CLANG' || ''}}"
runs-on: windows-2022
env:
PHP_BUILD_CACHE_BASE_DIR: C:\build-cache
Expand All @@ -949,6 +949,7 @@ jobs:
PARALLEL: -j2
OPCACHE: "${{ matrix.opcache && '1' || '0' }}"
ASAN: "${{ matrix.asan && '1' || '0' }}"
CLANG_TOOLSET: "${{ matrix.clang && '1' || '0' }}"
steps:
- name: git config
run: git config --global core.autocrlf false && git config --global core.eol lf
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