From c6f3aaccbb90508eb681a7b577cbac133b17e478 Mon Sep 17 00:00:00 2001
From: Ludovic Henry <git@ludovic.dev>
Date: Mon, 5 Oct 2026 08:47:56 +0000
Subject: [PATCH] python-flint: add riscv64 wheel build for 0.9.0

---
 .github/workflows/build-python-flint.yml      | 128 ++++++++++++++++++
 docs/packages/python-flint.yaml               |   6 +
 ...riscv64-cibw_before_all_linux-script.patch |  42 ++++++
 3 files changed, 176 insertions(+)
 create mode 100644 .github/workflows/build-python-flint.yml
 create mode 100644 docs/packages/python-flint.yaml
 create mode 100644 patches/python-flint/0.9.0/0001-bin-add-a-riscv64-cibw_before_all_linux-script.patch

diff --git a/.github/workflows/build-python-flint.yml b/.github/workflows/build-python-flint.yml
new file mode 100644
index 00000000000..cebdb5e1045
--- /dev/null
+++ b/.github/workflows/build-python-flint.yml
@@ -0,0 +1,128 @@
+# SPDX-FileCopyrightText: 2026 The RISE Project
+# SPDX-License-Identifier: MIT
+---
+# This workflow is based on: https://github.com/flintlib/python-flint/blob/0.9.0/.github/workflows/buildwheel.yml
+name: Build python-flint wheels (riscv64)
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'Version glob to (re)build; empty builds every version of docs/packages/python-flint.yaml not released yet'
+        required: false
+        default: ''
+  pull_request:
+    branches: [main]
+    paths:
+      - '.github/workflows/build-python-flint.yml'
+      - 'docs/packages/python-flint.yaml'
+      - 'patches/python-flint/**'
+  push:
+    branches: [main]
+    paths:
+      - '.github/workflows/build-python-flint.yml'
+      - 'docs/packages/python-flint.yaml'
+      - 'patches/python-flint/**'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read  # to fetch code (actions/checkout)
+
+env:
+  MANYLINUX_RISCV64_IMAGE: quay.io/pypa/manylinux_2_39_riscv64
+
+jobs:
+  setup:
+    uses: $/.github/workflows/_setup.yml
+    with:
+      package: python-flint
+      version: ${{ inputs.version }}
+
+  build_wheels:
+    needs: [setup]
+    if: needs.setup.outputs.versions != '[]'
+    name: Build python-flint ${{ matrix.version }} ${{ matrix.python }}-manylinux_riscv64
+    runs-on: ubuntu-24.04-riscv
+    timeout-minutes: 120
+    strategy:
+      fail-fast: false
+      matrix:
+        version: ${{ fromJSON(needs.setup.outputs.versions) }}
+        python: ["cp312", "cp313", "cp314", "cp314t"]
+
+    env:
+      PYTHON_FLINT_VERSION: ${{ matrix.version }}
+
+    steps:
+      - name: Checkout python-flint ${{ env.PYTHON_FLINT_VERSION }}
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          repository: flintlib/python-flint
+          ref: ${{ env.PYTHON_FLINT_VERSION }}
+          persist-credentials: false
+
+      - name: Checkout python-wheels
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          path: python-wheels
+          persist-credentials: false
+
+      # pyproject.toml's [tool.cibuildwheel.linux] before-all dispatches to
+      # bin/cibw_before_all_linux_$(uname -m).sh, which only exists for
+      # x86_64/aarch64 upstream.
+      - name: Patch python-flint source
+        run: git apply python-wheels/patches/python-flint/${{ env.PYTHON_FLINT_VERSION }}/00*.patch
+
+      - name: Build wheels
+        uses: pypa/cibuildwheel@1828c10ab37f080699c7b81cea34097c684a7074  # v4.2.0
+        with:
+          output-dir: wheelhouse/
+          only: ${{ matrix.python }}-manylinux_riscv64
+        env:
+          CIBW_MANYLINUX_RISCV64_IMAGE: ${{ env.MANYLINUX_RISCV64_IMAGE }}
+          # Restates upstream's [tool.cibuildwheel.linux.environment], which
+          # CIBW_ENVIRONMENT replaces wholesale. PIP_EXTRA_INDEX_URL resolves
+          # the meson-python/cython/ninja build requirements, which have no
+          # riscv64 wheel on PyPI.
+          CIBW_ENVIRONMENT: >-
+            LD_LIBRARY_PATH=$(pwd)/.local/lib:$LD_LIBRARY_PATH
+            PKG_CONFIG_PATH=$(pwd)/.local/lib/pkgconfig
+            PIP_EXTRA_INDEX_URL=https://pypi.riseproject.dev/simple/
+          CIBW_TEST_COMMAND: python -m flint.test -q
+
+      - name: Check the extension made it into the wheel
+        run: |
+          python3 - wheelhouse/*.whl <<'EOF'
+          import sys, zipfile
+          for whl in sys.argv[1:]:
+              names = zipfile.ZipFile(whl).namelist()
+              got = {n for n in names if n.endswith(".so")}
+              assert got, f"{whl}: no .so found"
+              print(whl, sorted(got))
+          EOF
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: python-flint-${{ env.PYTHON_FLINT_VERSION }}-${{ matrix.python }}-manylinux_riscv64
+          path: wheelhouse/*.whl
+          if-no-files-found: error
+
+  publish:
+    name: Publish python-flint ${{ matrix.version }}
+    needs: [setup, build_wheels]
+    if: needs.setup.outputs.versions != '[]'
+    strategy:
+      fail-fast: false
+      matrix:
+        version: ${{ fromJSON(needs.setup.outputs.versions) }}
+    permissions:
+      contents: write
+      pull-requests: write
+    uses: $/.github/workflows/_publish-wheel.yml
+    secrets:
+      app-private-key: ${{ secrets.RISEPROJECT_APP_PRIVATE_KEY }}
+    with:
+      artifact-pattern: python-flint-${{ matrix.version }}-*-manylinux_riscv64
diff --git a/docs/packages/python-flint.yaml b/docs/packages/python-flint.yaml
new file mode 100644
index 00000000000..82991a861c9
--- /dev/null
+++ b/docs/packages/python-flint.yaml
@@ -0,0 +1,6 @@
+package-name: python-flint
+source-code: https://github.com/flintlib/python-flint
+license: MIT
+versions:
+- version: 0.9.0
+  patched: true
diff --git a/patches/python-flint/0.9.0/0001-bin-add-a-riscv64-cibw_before_all_linux-script.patch b/patches/python-flint/0.9.0/0001-bin-add-a-riscv64-cibw_before_all_linux-script.patch
new file mode 100644
index 00000000000..0439b7b86fe
--- /dev/null
+++ b/patches/python-flint/0.9.0/0001-bin-add-a-riscv64-cibw_before_all_linux-script.patch
@@ -0,0 +1,42 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Ludovic Henry <git@ludovic.dev>
+Date: Mon, 5 Oct 2026 08:15:32 +0000
+Subject: [PATCH] bin: add a riscv64 cibw_before_all_linux script
+
+Upstream-Status: Inappropriate [new riscv64 port, not an upstream platform]
+
+python-flint's own cibuildwheel config dispatches per architecture via
+bin/cibw_before_all_linux_$(uname -m).sh (pyproject.toml's
+[tool.cibuildwheel.linux] before-all), with a script already present
+for x86_64 and aarch64 but none for riscv64. Add one that mirrors the
+existing two verbatim but for the riscv64 host triplet: it builds GMP,
+MPFR and FLINT from the same upstream source tarballs
+(bin/build_dependencies_unix.sh, bin/build_variables.sh) with no
+riscv64-specific changes to that shared script.
+
+GMP 6.3.0 has a native riscv64 assembly path (configure.ac's
+riscv64-*-* case, asm_path=riscv/64); FLINT 3.6.0 has no riscv64-
+specific code at all and falls through configure.ac's default case
+(asm_path="" param_path=generic), the same portable-C path it already
+uses on every non-x86_64/non-arm64 architecture it supports (s390x,
+ppc64le, ...). Neither needs a patch of its own.
+---
+ bin/cibw_before_all_linux_riscv64.sh | 9 +++++++++
+ 1 file changed, 9 insertions(+)
+ create mode 100755 bin/cibw_before_all_linux_riscv64.sh
+
+diff --git a/bin/cibw_before_all_linux_riscv64.sh b/bin/cibw_before_all_linux_riscv64.sh
+new file mode 100755
+index 0000000..9a523e2
+--- /dev/null
++++ b/bin/cibw_before_all_linux_riscv64.sh
+@@ -0,0 +1,9 @@
++#!/usr/bin/env bash
++
++set -e
++
++yum install -y xz
++bin/build_dependencies_unix.sh\
++  --gmp gmp\
++  --host riscv64-pc-linux-gnu\
++  --use-gmp-github-mirror