added MinGW workflow

.github/workflows/CI-mingw.yml

@@ -0,0 +1,117 @@
+name: CI-mingw
+
+on: [push, pull_request]
+
+permissions:
+  contents: read
+
+defaults:
+  run:
+    shell: msys2 {0}
+
+jobs:
+  build:
+
+    strategy:
+      matrix:
+        compiler: [g++, clang++]
+        msystem: [MSYS, MINGW32, MINGW64, CLANG64]
+        include:
+          - msystem: MSYS
+            pkg-prefix: ''
+          - msystem: MINGW32
+            pkg-prefix: 'mingw-w64-i686-'
+          - msystem: MINGW64
+            pkg-prefix: 'mingw-w64-x86_64-'
+          - msystem: CLANG64
+            pkg-prefix: 'mingw-w64-clang-x86_64-'
+          - compiler: g++
+            compiler-pkg: gcc
+          - compiler: clang++
+            compiler-pkg: clang
+        exclude:
+          - msystem: CLANG64
+            compiler: g++
+      fail-fast: false
+
+    runs-on: windows-2025
+
+    env:
+      CXX: ${{ matrix.compiler }}
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+
+      - name: Set up MSYS2
+        uses: msys2/setup-msys2@v2
+        with:
+          release: false # use pre-installed
+          msystem: ${{ matrix.msystem }}
+          # TODO: install mingw-w64-x86_64-make and use mingw32.make instead - currently fails with "Windows Subsystem for Linux has no installed distributions."
+          # TODO: also run tests with non-prefixed Python?
+          install: >-
+            make
+            ${{ matrix.pkg-prefix }}cmake
+            ${{ matrix.pkg-prefix }}python
+            ${{ matrix.pkg-prefix }}python-pytest
+
+      - name: install compiler
+        run: |
+          pacman -S --noconfirm ${{ matrix.pkg-prefix }}${{ matrix.compiler-pkg }}
+          ${CXX} -v
+
+      - name: make simplecpp
+        run: |
+          make -j$(nproc) CXXOPTS="-Werror"
+
+      # gcc *and* clang are required to run-tests.py
+      # install it at this point since it has gcc as dependency which might interfere with the build
+      - name: install compiler (clang)
+        if: matrix.compiler == 'g++'
+        run: |
+          pacman -S --noconfirm clang
+
+      - name: install compiler (gcc)
+        if: matrix.compiler == 'clang++'
+        run: |
+          pacman -S --noconfirm gcc
+
+      - name: make test
+        run: |
+          # TODO: run tests with Windows paths
+          make -j$(nproc) test
+
+      - name: selfcheck
+        run: |
+          # TODO: run tests with Windows paths
+          make -j$(nproc) selfcheck
+
+      - name: Run CMake
+        run: |
+          cmake -S . -B cmake.output -DCMAKE_COMPILE_WARNING_AS_ERROR=On
+
+      - name: CMake simplecpp
+        run: |
+          cmake --build cmake.output --target simplecpp -- -j $(nproc)
+
+      - name: CMake testrunner
+        run: |
+          cmake --build cmake.output --target testrunner -- -j $(nproc)
+
+      - name: Run testrunner
+        run: |
+          ./cmake.output/testrunner
+
+      - name: Run with libstdc++ debug mode
+        if: matrix.compiler == 'g++'
+        run: |
+          make clean
+          make -j$(nproc) test selfcheck CXXOPTS="-Werror -g3 -D_GLIBCXX_DEBUG"
+
+      - name: Run with libc++ hardening mode
+        if: matrix.compiler == 'clang++' && matrix.msystem == 'CLANG64'
+        run: |
+          make clean
+          make -j$(nproc) test selfcheck CXXOPTS="-Werror -stdlib=libc++ -g3 -D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_DEBUG" LDOPTS="-lc++"

CMakeLists.txt

@@ -34,7 +34,9 @@ if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
     add_compile_options(-Woverloaded-virtual)       # when a function declaration hides virtual functions from a base class
 
     add_compile_options(-Wsuggest-attribute=noreturn)
-    add_compile_options_safe(-Wuseless-cast)
+    if (NOT MINGW)
+        add_compile_options_safe(-Wuseless-cast)
+    endif()
 
     # we are not interested in these
     set_source_files_properties(test.cpp PROPERTIES COMPILE_FLAGS -Wno-multichar)
@@ -62,6 +64,14 @@ elseif (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
 
     # contradicts -Wcovered-switch-default
     add_compile_options(-Wno-switch-default)
+    if (MINGW)
+        add_compile_options(-Wno-reserved-macro-identifier)
+        add_compile_options(-Wno-unused-macros)
+    endif()
+
+    # these are experimental warning which might produce false positives
+    add_compile_options_safe(-Wno-thread-safety-negative)
+    add_compile_options_safe(-Wno-thread-safety-beta)
 
     # TODO: fix these?
     add_compile_options(-Wno-padded)

selfcheck.sh

@@ -41,16 +41,20 @@ if [ "$cxx_type" = "Ubuntu" ] || [ "$cxx_type" = "Debian" ]; then
 fi
 
 # TODO: generate defines from compiler
-if [ "$cxx_type" = "g++" ]; then
+if [ "$cxx_type" = "g++" ] || [ "$cxx_type" = "g++.exe" ]; then
   defs=
   defs="$defs -D__GNUC__"
   defs="$defs -D__STDC__"
   defs="$defs -D__x86_64__"
   defs="$defs -D__STDC_HOSTED__"
   defs="$defs -D__CHAR_BIT__=8"
+  if [ "${MSYSTEM}" = "MINGW32" ] || [ "${MSYSTEM}" = "MINGW64" ]; then
+    defs="$defs -D_WIN32"
+  fi
   defs="$defs -D__has_builtin(x)=(1)"
   defs="$defs -D__has_cpp_attribute(x)=(1)"
   defs="$defs -D__has_attribute(x)=(1)"
+  defs="$defs -Ddefined(x)=(0)"
 
   inc=
   while read line
@@ -63,12 +67,19 @@ elif [ "$cxx_type" = "clang" ]; then
   defs="$defs -D__x86_64__"
   defs="$defs -D__STDC_HOSTED__"
   defs="$defs -D__CHAR_BIT__=8"
+  defs="$defs -D__BYTE_ORDER__=1234"
+  defs="$defs -D__SIZEOF_SIZE_T__=8"
+  if [ "${MSYSTEM}" = "MINGW32" ] || [ "${MSYSTEM}" = "MINGW64" ] || [ "${MSYSTEM}" = "CLANG64" ]; then
+    defs="$defs -D_WIN32"
+  fi
   defs="$defs -D__has_builtin(x)=(1)"
   defs="$defs -D__has_cpp_attribute(x)=(1)"
   defs="$defs -D__has_feature(x)=(1)"
-  defs="$defs -D__has_include_next(x)=(0)"
+  defs="$defs -D__has_include_next(x)=(1)"
   defs="$defs -D__has_attribute(x)=(0)"
   defs="$defs -D__building_module(x)=(0)"
+  defs="$defs -D__has_extension(x)=(1)"
+  defs="$defs -Ddefined(x)=(0)"
 
   inc=
   while read line

simplecpp.cpp

@@ -3121,7 +3121,7 @@ std::pair<simplecpp::FileData *, bool> simplecpp::FileDataCache::get(const std::
 bool simplecpp::FileDataCache::getFileId(const std::string &path, FileID &id)
 {
 #ifdef _WIN32
-    HANDLE hFile = CreateFileA(path.c_str(), 0, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
+    HANDLE hFile = CreateFileA(path.c_str(), 0, FILE_SHARE_READ | FILE_SHARE_WRITE, nullptr, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, nullptr);
 
     if (hFile == INVALID_HANDLE_VALUE)
         return false;