Fix #14223 (CI: Build windows release binary with mingw for comparisons) (#7909)

Author: danmar

.github/workflows/release-windows-mingw.yml

@@ -0,0 +1,69 @@
+# Syntax reference https://help.github.com/en/actions/reference/workflow-syntax-for-github-actions
+# Environment reference https://help.github.com/en/actions/reference/virtual-environments-for-github-hosted-runners
+name: release-windows-mingw
+
+on:
+  push:
+    branches:
+      - 'main'
+      - 'releases/**'
+      - '2.*'
+    tags:
+      - '2.*'
+  pull_request:
+
+permissions:
+  contents: read
+
+defaults:
+  run:
+    shell: msys2 {0}
+
+jobs:
+  # TODO: add CMake build
+  build_mingw:
+    strategy:
+      matrix:
+        # only use the latest windows-* as the installed toolchain is identical
+        os: [windows-2025]
+      fail-fast: false
+
+    runs-on: ${{ matrix.os }}
+
+    timeout-minutes: 19 # max + 3*std of the last 7K runs
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+
+      - name: Set up MSYS2
+        uses: msys2/setup-msys2@v2
+        with:
+          release: false # use pre-installed
+          # TODO: install mingw-w64-x86_64-make and use mingw32.make instead - currently fails with "Windows Subsystem for Linux has no installed distributions."
+          install: >-
+            mingw-w64-x86_64-lld
+            make
+            mingw-w64-x86_64-gcc
+            python
+
+      - name: Build cppcheck
+        run: |
+          export PATH="/mingw64/lib/ccache/bin:$PATH"
+          # set RDYNAMIC to work around broken MinGW detection
+          make VERBOSE=1 RDYNAMIC=-lshlwapi -j$(nproc) CXXFLAGS=-O2 MATCHCOMPILER=yes cppcheck
+
+      - name: Package
+        run: |
+          mkdir cppcheck-mingw
+          cp cppcheck.exe cppcheck-mingw/
+          cp -R cfg platforms cppcheck-mingw/
+          cp /mingw64/bin/libgcc_s_seh-1.dll cppcheck-mingw/
+          cp /mingw64/bin/libstdc*.dll cppcheck-mingw/
+          cp /mingw64/bin/libwinpthread-1.dll cppcheck-mingw/
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: cppcheck-mingw
+          path: cppcheck-mingw