From 7b0a0b374d2c7b9d614887ea1cc144afaec00eeb Mon Sep 17 00:00:00 2001
From: Alexander Grund <Flamefire@users.noreply.github.com>
Date: Mon, 29 Sep 2025 11:21:38 +0200
Subject: [PATCH] Test Boost configure with different CMake versions

Add a configure-only test with different CMake versions.
Use especially those that are tested for in CMake files.
---
 .github/workflows/ci.yml | 31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e0c69bc..f635bf7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -386,6 +386,7 @@ jobs:
     strategy:
       matrix:
         enable_test: [ON, OFF]
+        cmake_version: [default, 3.5.0, 3.6.0, 3.8.0, 3.10.0, 3.13.0, 3.14.0, 3.16.0, 3.19.0, 3.31.0, 4.0.0, 4.1.0]
       fail-fast: false
 
     runs-on: ubuntu-latest
@@ -406,10 +407,11 @@ jobs:
           rm -rf tools/cmake/*
           cp -r $GITHUB_WORKSPACE/* tools/cmake
       - name: Configure each library independently
+        working-directory: ../boost-root
+        if: matrix.cmake_version == 'default'
         run: |
           failed_libs=""
           failed_outputs=()
-          cd ../boost-root
           for cml in libs/*/CMakeLists.txt; do
             lib=$(dirname "${cml#*libs/}")
             echo "====================================================================="
@@ -436,6 +438,33 @@ jobs:
             exit 1
           fi
 
+      - name: Cache CMake
+        if: matrix.cmake_version != 'default'
+        id: cache-cmake
+        uses: actions/cache@v4
+        with:
+          path: /tmp/cmake
+          key: ${{ runner.os }}-cmake-${{matrix.cmake_version}}
+
+      - name: Build CMake
+        if: matrix.cmake_version != 'default' && steps.cache-cmake.outputs.cache-hit != 'true'
+        run: |
+            version=${{matrix.cmake_version}}
+            filename="cmake-$version.tar.gz"
+            cd "$(mktemp -d)"
+            wget https://cmake.org/files/v${version%.*}/$filename
+            tar -xf $filename --strip-components=1
+            cmake -B __build -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/tmp/cmake .
+            cmake --build __build -- -j 3
+            cmake --build __build --target install
+
+      - name: Configure Boost with CMake ${{matrix.cmake_version}}
+        working-directory: ../boost-root
+        if: matrix.cmake_version != 'default'
+        run: |
+          /tmp/cmake/bin/cmake --version
+          /tmp/cmake/bin/cmake -DBUILD_TESTING=${{matrix.enable_test}} -B "__build_cmake-$version" .
+
   BoostTest:
     strategy:
       fail-fast: false