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Add Python freethreading build #22443

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f61c921
[ci] Make Python environment path configurable
guitargeek Jun 1, 2026
bacf5f6
[ci] Add Python freethreading build
guitargeek Jun 1, 2026
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13 changes: 10 additions & 3 deletions .github/workflows/root-ci.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -157,7 +157,7 @@
INCREMENTAL: ${{ !contains(github.event.pull_request.labels.*.name, 'clean build') && !matrix.platform == 'mac15' && !matrix.platform == 'mac26'}}
GITHUB_PR_ORIGIN: ${{ github.event.pull_request.head.repo.clone_url }}
OVERRIDES: ${{ join( matrix.overrides, ' ') }}
run: |

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GitHub Actions / lint-action-files 

"github.event.pull_request.head.ref" is potentially untrusted. avoid using it directly in inline scripts. instead, pass it through an environment variable. see https://docs.github.com/en/actions/reference/security/secure-use#good-practices-for-mitigating-script-injection-attacks for more details

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GitHub Actions / lint-action-files 

"github.event.pull_request.head.ref" is potentially untrusted. avoid using it directly in inline scripts. instead, pass it through an environment variable. see https://docs.github.com/en/actions/reference/security/secure-use#good-practices-for-mitigating-script-injection-attacks for more details
[ -d "${VIRTUAL_ENV_DIR}" ] && source ${VIRTUAL_ENV_DIR}/bin/activate
echo "Python is now $(which python3) $(python3 --version)"
src/.github/workflows/root-ci-config/build_root.py \
Expand Down Expand Up @@ -287,7 +287,7 @@
INCREMENTAL: ${{ !contains(github.event.pull_request.labels.*.name, 'clean build') }}
GITHUB_PR_ORIGIN: ${{ github.event.pull_request.head.repo.clone_url }}
shell: cmd
run: "C:\\setenv.bat ${{ matrix.target_arch }} &&

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GitHub Actions / lint-action-files 

"github.event.pull_request.head.ref" is potentially untrusted. avoid using it directly in inline scripts. instead, pass it through an environment variable. see https://docs.github.com/en/actions/reference/security/secure-use#good-practices-for-mitigating-script-injection-attacks for more details

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GitHub Actions / lint-action-files 

"github.event.pull_request.head.ref" is potentially untrusted. avoid using it directly in inline scripts. instead, pass it through an environment variable. see https://docs.github.com/en/actions/reference/security/secure-use#good-practices-for-mitigating-script-injection-attacks for more details
python .github/workflows/root-ci-config/build_root.py
--buildtype ${{ matrix.config }}
--platform windows10
Expand Down Expand Up @@ -420,6 +420,12 @@
is_special: true
property: "Fedora pydebug"
overrides: ["CMAKE_CXX_STANDARD=23"]
# Fedora Rawhide with Python freethreading build
- image: rawhide
python_venv: "/py-venv-3.14t/ROOT-CI"
is_special: true
property: "Fedora pydebug freethreading"
overrides: ["CMAKE_CXX_STANDARD=23"]
# Minimal build
- image: alma10
platform_config: alma10-minimal
Expand Down Expand Up @@ -447,7 +453,7 @@
- self-hosted
- linux
- ${{ matrix.architecture == null && 'x64' || matrix.architecture }}
- ${{ matrix.extra-runs-on == null && 'cpu' || matrix.extra-runs-on }}

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property "extra-runs-on" is not defined in object type {architecture: string; image: string; is_special: bool; overrides: array<string>; platform_config: string; property: string; python_venv: string}

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property "extra-runs-on" is not defined in object type {architecture: string; image: string; is_special: bool; overrides: array<string>; platform_config: string; property: string; python_venv: string}

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GitHub Actions / lint-action-files 

property "extra-runs-on" is not defined in object type {architecture: string; image: string; is_special: bool; overrides: array<string>; platform_config: string; property: string; python_venv: string}

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GitHub Actions / lint-action-files 

property "extra-runs-on" is not defined in object type {architecture: string; image: string; is_special: bool; overrides: array<string>; platform_config: string; property: string; python_venv: string}

name: |
${{ matrix.image }} ${{ matrix.property }}
Expand All @@ -466,14 +472,15 @@
BUILD_DIR: /github/home/ROOT-CI/build
INSTALL_DIR: /github/home/ROOT-CI/install
POST_INSTALL_DIR: /github/home/ROOT-CI/PostInstall
PYTHON_VENV: ${{ matrix.python_venv || '/py-venv/ROOT-CI' }}

steps:
- name: Set up environment
run: |
ccache -o max_size=${{ matrix.is_special && '5G' || '1.5G' }}
ccache -s || true
if [ -d /py-venv/ROOT-CI/bin/ ]; then
. /py-venv/ROOT-CI/bin/activate && echo PATH=$PATH >> $GITHUB_ENV;
if [ -d "$PYTHON_VENV/bin/" ]; then
. "$PYTHON_VENV/bin/activate" && echo PATH=$PATH >> $GITHUB_ENV;
fi
if ${{ contains(matrix.property, 'auto-registration off') }}; then
echo "Disabling ROOT's object auto registration for this job"
Expand Down Expand Up @@ -513,7 +520,7 @@
INCREMENTAL: ${{ !contains(github.event.pull_request.labels.*.name, 'clean build') }}
GITHUB_PR_ORIGIN: ${{ github.event.pull_request.head.repo.clone_url }}
OVERRIDES: ${{ join( matrix.overrides, ' ') }}
run: ".github/workflows/root-ci-config/build_root.py

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GitHub Actions / lint-action-files 

"github.event.pull_request.head.ref" is potentially untrusted. avoid using it directly in inline scripts. instead, pass it through an environment variable. see https://docs.github.com/en/actions/reference/security/secure-use#good-practices-for-mitigating-script-injection-attacks for more details

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GitHub Actions / lint-action-files 

"github.event.pull_request.head.ref" is potentially untrusted. avoid using it directly in inline scripts. instead, pass it through an environment variable. see https://docs.github.com/en/actions/reference/security/secure-use#good-practices-for-mitigating-script-injection-attacks for more details
--buildtype RelWithDebInfo
--platform ${{ matrix.image }}
--platform_config ${{ matrix.platform_config }}
Expand Down Expand Up @@ -662,4 +669,4 @@
KRB5REALM: ${{ secrets.KRB5REALM }}
KRB5USER: ${{ secrets.KRB5USER }}
with:
branch: ${{ github.head_ref || github.ref_name }}
branch: ${{ github.head_ref || github.ref_name }}
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