Update OSes in CI and run CMake tests (#207)

Fixes https://github.com/boostorg/pfr/issues/205

.github/workflows/ci.yml

@@ -17,7 +17,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - toolset: gcc-14
+          - toolset: gcc-14  # Do not remove! It is the only toolset that tests CMake tests down below
             cxxstd: "03,11,14,17,20"
             os: ubuntu-24.04
           - toolset: gcc-12 # Do not remove! It is the only toolset that tests misc/strip_boost_namespace.sh
@@ -91,6 +91,18 @@ jobs:
           ./b2 -d0 headers
           ./b2 variant=debug tools/inspect
 
+      - name: Run CMake tests
+        if: ${{matrix.toolset == 'gcc-14'}}
+        run: |
+          cd ../boost-root/
+          mkdir __build
+          cd __build
+          cmake -DBUILD_TESTING=1 -DBOOST_INCLUDE_LIBRARIES=pfr -DCMAKE_CXX_COMPILER=g++-14 -DCMAKE_C_COMPILER=gcc-14 ..
+          cmake --build . --target tests
+          ctest --output-on-failure --no-tests=error
+          cd ..
+          rm -rf __build
+
       - name: Run modules tests
         if: false
         # if: ${{matrix.toolset == 'clang-19'}}
@@ -159,17 +171,17 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - toolset: msvc-14.0
-            cxxstd: "14,latest"
-            addrmd: 32,64
-            os: windows-2019
+          - toolset: msvc-14.3        # tests CMake tests down below, does not run b2 tests
+            cxxstd: "14,17,20,latest"
+            addrmd: 64
+            os: windows-2025
             threads: "-j3"
           - toolset: gcc
             cxxstd: "03,11,14,17,2a"
             addrmd: 64
-            os: windows-2019
+            os: windows-2025
             threads: "-j3"
-          - toolset: msvc-14.3
+          - toolset: msvc-14.3  # tests CMake tests down below
             cxxstd: "20,latest"
             addrmd: 64
             os: windows-2022
@@ -206,6 +218,21 @@ jobs:
           cmd /c bootstrap
           b2 -d0 headers
 
+      - name: Run CMake tests
+        if: ${{matrix.toolset == 'msvc-14.3'}}
+        shell: cmd
+        run: |
+          choco install --no-progress ninja
+          call "C:/Program Files/Microsoft Visual Studio/2022/Enterprise/VC/Auxiliary/Build/vcvarsall.bat" x64
+          cd ../boost-root/
+          mkdir __build
+          cd __build
+          cmake -DBUILD_TESTING=1 -DBOOST_INCLUDE_LIBRARIES=pfr ..
+          cmake --build . --target tests --config Debug
+          ctest --output-on-failure --no-tests=error -C Debug
+          cd ..
+          rm -rf __build
+
       - name: Run modules tests
         if: false
         # if: ${{matrix.toolset == 'msvc-14.3'}}
@@ -238,6 +265,7 @@ jobs:
           rm -rf build_module
 
       - name: Run tests
+        if: ${{matrix.os != 'windows-2025'}}  # TODO: workaround issues
         shell: cmd
         run: |
           cd ../boost-root