diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8336eee12..b75b06cfd 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -273,6 +273,53 @@ jobs:
             _build/${{ matrix.arch }}/${{ matrix.config }}/*.lib
             _build/${{ matrix.arch }}/${{ matrix.config }}/*.pdb
 
+  test-llvm-mingw-cppwinrt:
+    name: 'llvm-mingw: Build and test'
+    strategy:
+      matrix:
+        arch: [i686, x86_64]
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Install llvm-mingw toolchain
+        run: |
+          $llvm_mingw_version = "20220906"
+          Invoke-WebRequest "https://github.com/mstorsjo/llvm-mingw/releases/download/${llvm_mingw_version}/llvm-mingw-${llvm_mingw_version}-ucrt-${{ matrix.arch }}.zip" -OutFile llvm-mingw.zip
+          7z x llvm-mingw.zip
+          rm llvm-mingw.zip
+          if (!(Test-Path "$pwd\llvm-mingw-${llvm_mingw_version}-ucrt-${{ matrix.arch }}\bin\clang++.exe")) { return 1 }
+          Add-Content $env:GITHUB_PATH "$pwd\llvm-mingw-${llvm_mingw_version}-ucrt-${{ matrix.arch }}\bin"
+
+      - name: Build cppwinrt
+        run: |
+          mkdir build
+          cd build
+          cmake ../ -G"MinGW Makefiles" -DCMAKE_BUILD_TYPE=Debug
+          cmake --build . --target cppwinrt
+
+      - name: Upload cppwinrt.exe
+        uses: actions/upload-artifact@v3
+        with:
+          name: llvm-mingw-build-${{ matrix.arch }}-bin
+          path: build/cppwinrt.exe
+
+      - name: Build tests
+        run: |
+          cd build
+          cmake --build . --target test-vanilla test_win7
+
+      - name: Upload test binaries
+        uses: actions/upload-artifact@v3
+        with:
+          name: llvm-mingw-tests-${{ matrix.arch }}-bin
+          path: build/test/*.exe
+
+      - name: Run tests
+        run: |
+          cd build
+          ctest --verbose
+
   build-msvc-natvis:
     name: 'Build natvis'
     strategy:
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 000000000..0a60ba31e
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,167 @@
+# This CMake build file is intended for use with the llvm-mingw toolchain:
+# https://github.com/mstorsjo/llvm-mingw
+#
+# It most probably doesn't work with MSVC.
+
+cmake_minimum_required(VERSION 3.12)
+
+project(cppwinrt LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED True)
+
+set(CPPWINRT_BUILD_VERSION "2.3.4.5" CACHE STRING "The version string used for cppwinrt.")
+add_compile_definitions(CPPWINRT_VERSION_STRING="${CPPWINRT_BUILD_VERSION}")
+
+# WinMD uses CreateFile2 which requires Windows 8.
+add_compile_definitions(_WIN32_WINNT=0x0602)
+
+
+# === prebuild: Generator tool for strings.cpp, strings.h, version.rc ===
+
+set(PREBUILD_SRCS
+    prebuild/main.cpp
+    prebuild/pch.h
+)
+add_executable(prebuild ${PREBUILD_SRCS})
+target_include_directories(prebuild PRIVATE cppwinrt/)
+
+
+# === Step to create autogenerated files ===
+
+file(GLOB PREBUILD_STRINGS_FILES
+    LIST_DIRECTORIES false
+    CONFIGURE_DEPENDS
+    strings/*.h
+)
+add_custom_command(
+    OUTPUT
+        ${PROJECT_BINARY_DIR}/strings.cpp
+        ${PROJECT_BINARY_DIR}/version.rc
+    COMMAND "${PROJECT_BINARY_DIR}/prebuild.exe" ARGS "${PROJECT_SOURCE_DIR}/strings" "${PROJECT_BINARY_DIR}"
+    DEPENDS
+        prebuild
+        ${PREBUILD_STRINGS_FILES}
+    VERBATIM
+)
+
+
+# === cppwinrt ===
+
+set(CPPWINRT_SRCS
+    cppwinrt/main.cpp
+    "${PROJECT_BINARY_DIR}/strings.cpp"
+)
+
+set(CPPWINRT_HEADERS
+    cppwinrt/pch.h
+    cppwinrt/cmd_reader.h
+    cppwinrt/code_writers.h
+    cppwinrt/component_writers.h
+    cppwinrt/file_writers.h
+    cppwinrt/helpers.h
+    cppwinrt/pch.h
+    cppwinrt/settings.h
+    cppwinrt/task_group.h
+    cppwinrt/text_writer.h
+    cppwinrt/type_writers.h
+)
+
+add_custom_command(
+    OUTPUT
+        "${PROJECT_BINARY_DIR}/app.manifest"
+    COMMAND ${CMAKE_COMMAND} -E copy "${PROJECT_SOURCE_DIR}/cppwinrt/app.manifest" "${PROJECT_BINARY_DIR}/app.manifest"
+    DEPENDS "${PROJECT_SOURCE_DIR}/cppwinrt/app.manifest"
+    VERBATIM
+)
+# Do the configure_file dance so that app.manifest.rc don't get modified every
+# single time the project is reconfigured and trigger a rebuild.
+file(WRITE "${PROJECT_BINARY_DIR}/app.manifest.rc.in" "1 24 \"app.manifest\"\n")
+configure_file(
+    "${PROJECT_BINARY_DIR}/app.manifest.rc.in"
+    "${PROJECT_BINARY_DIR}/app.manifest.rc"
+    COPYONLY
+)
+
+set(CPPWINRT_RESOURCES
+    "${PROJECT_BINARY_DIR}/app.manifest"
+    "${PROJECT_BINARY_DIR}/app.manifest.rc"
+    "${PROJECT_BINARY_DIR}/version.rc"
+)
+
+add_executable(cppwinrt ${CPPWINRT_SRCS} ${CPPWINRT_RESOURCES} ${CPPWINRT_HEADERS})
+target_include_directories(cppwinrt PRIVATE ${PROJECT_BINARY_DIR})
+target_link_libraries(cppwinrt shlwapi)
+
+
+# HACK: Handle the xmllite import lib.
+# mingw-w64 before commit 5ac1a2c is missing the import lib for xmllite. This
+# checks whether the current build environment provides libxmllite.a, and
+# generates the import lib if needed.
+
+set(XMLLITE_LIBRARY xmllite)
+if(MINGW)
+    function(TestLinkXmlLite OUTPUT_VARNAME)
+        include(CheckCXXSourceCompiles)
+        set(CMAKE_REQUIRED_LIBRARIES xmllite)
+        check_cxx_source_compiles("
+#include <xmllite.h>
+int main() {
+    CreateXmlReader(__uuidof(IXmlReader), nullptr, nullptr);
+}
+        " ${OUTPUT_VARNAME})
+    endfunction()
+
+    function(TestIsI386 OUTPUT_VARNAME)
+        include(CheckCXXSourceCompiles)
+        check_cxx_source_compiles("
+#if !defined(__i386__) && !defined(_M_IX86)
+#  error Not i386
+#endif
+int main() {}
+        " ${OUTPUT_VARNAME})
+    endfunction()
+
+    TestLinkXmlLite(HAS_LIBXMLLITE)
+    if(NOT HAS_LIBXMLLITE)
+        TestIsI386(TARGET_IS_I386)
+        if(TARGET_IS_I386)
+            set(XMLLITE_DEF_FILE xmllite_i386)
+        else()
+            set(XMLLITE_DEF_FILE xmllite)
+        endif()
+        add_custom_command(
+            OUTPUT
+                "${PROJECT_BINARY_DIR}/libxmllite.a"
+            COMMAND dlltool -k -d "${PROJECT_SOURCE_DIR}/mingw-support/${XMLLITE_DEF_FILE}.def" -l "${PROJECT_BINARY_DIR}/libxmllite.a"
+            DEPENDS "${PROJECT_SOURCE_DIR}/mingw-support/${XMLLITE_DEF_FILE}.def"
+            VERBATIM
+        )
+        add_custom_target(gen-libxmllite
+            DEPENDS "${PROJECT_BINARY_DIR}/libxmllite.a"
+        )
+        set(XMLLITE_LIBRARY "${PROJECT_BINARY_DIR}/libxmllite.a")
+        add_dependencies(cppwinrt gen-libxmllite)
+    endif()
+endif()
+target_link_libraries(cppwinrt "${XMLLITE_LIBRARY}")
+
+
+# === winmd: External header-only library for reading winmd files ===
+
+include(ExternalProject)
+ExternalProject_Add(winmd
+    URL https://github.com/microsoft/winmd/releases/download/1.0.210629.2/Microsoft.Windows.WinMD.1.0.210629.2.nupkg
+    URL_HASH SHA256=4c5f29d948f5b3d724d229664c8f8e4823250d3c9f23ad8067b732fc7076d8c7
+    CONFIGURE_COMMAND ""
+    BUILD_COMMAND ""
+    INSTALL_COMMAND ""
+)
+add_dependencies(cppwinrt winmd)
+ExternalProject_Get_Property(winmd SOURCE_DIR)
+set(winmd_SOURCE_DIR "${SOURCE_DIR}")
+target_include_directories(cppwinrt PRIVATE "${winmd_SOURCE_DIR}")
+
+
+include(CTest)
+add_subdirectory(test)
diff --git a/mingw-support/xmllite.def b/mingw-support/xmllite.def
new file mode 100644
index 000000000..c96291d16
--- /dev/null
+++ b/mingw-support/xmllite.def
@@ -0,0 +1,8 @@
+LIBRARY "XmlLite.dll"
+EXPORTS
+CreateXmlReader
+CreateXmlReaderInputWithEncodingCodePage
+CreateXmlReaderInputWithEncodingName
+CreateXmlWriter
+CreateXmlWriterOutputWithEncodingCodePage
+CreateXmlWriterOutputWithEncodingName
diff --git a/mingw-support/xmllite_i386.def b/mingw-support/xmllite_i386.def
new file mode 100644
index 000000000..79921fce7
--- /dev/null
+++ b/mingw-support/xmllite_i386.def
@@ -0,0 +1,8 @@
+LIBRARY "XmlLite.dll"
+EXPORTS
+CreateXmlReader@12
+CreateXmlReaderInputWithEncodingCodePage@24
+CreateXmlReaderInputWithEncodingName@24
+CreateXmlWriter@12
+CreateXmlWriterOutputWithEncodingCodePage@16
+CreateXmlWriterOutputWithEncodingName@16
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
new file mode 100644
index 000000000..4cf322da9
--- /dev/null
+++ b/test/CMakeLists.txt
@@ -0,0 +1,40 @@
+# The tests use newer C++ features.
+set(CMAKE_CXX_STANDARD 20)
+
+set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
+
+include_directories("${CMAKE_CURRENT_SOURCE_DIR}")
+include_directories("${PROJECT_SOURCE_DIR}/cppwinrt")
+include_directories("${CMAKE_CURRENT_BINARY_DIR}/cppwinrt")
+
+function(TestIsX64 OUTPUT_VARNAME)
+    include(CheckCXXSourceCompiles)
+    check_cxx_source_compiles("
+#if !defined(__x86_64__) && !defined(_M_X64)
+#  error Not x86_64
+#endif
+int main() {}
+    " ${OUTPUT_VARNAME})
+endfunction()
+TestIsX64(TARGET_IS_X64)
+if(TARGET_IS_X64)
+    add_compile_options(-mcx16)
+endif()
+
+
+add_custom_command(
+    OUTPUT
+        "${CMAKE_CURRENT_BINARY_DIR}/cppwinrt/winrt/base.h"
+    COMMAND "${PROJECT_BINARY_DIR}/cppwinrt" -input local -output "${CMAKE_CURRENT_BINARY_DIR}/cppwinrt" -verbose
+    DEPENDS
+        cppwinrt
+    VERBATIM
+)
+add_custom_target(build-cppwinrt-projection
+    DEPENDS
+        "${CMAKE_CURRENT_BINARY_DIR}/cppwinrt/winrt/base.h"
+)
+
+
+add_subdirectory(test)
+add_subdirectory(test_win7)
diff --git a/test/mingw_com_support.h b/test/mingw_com_support.h
new file mode 100644
index 000000000..80e56455b
--- /dev/null
+++ b/test/mingw_com_support.h
@@ -0,0 +1,13 @@
+#if defined(__clang__)
+#define HAS_DECLSPEC_UUID __has_declspec_attribute(uuid)
+#elif defined(_MSC_VER)
+#define HAS_DECLSPEC_UUID 1
+#else
+#define HAS_DECLSPEC_UUID 0
+#endif
+
+#if HAS_DECLSPEC_UUID
+#define DECLSPEC_UUID(x) __declspec(uuid(x))
+#else
+#define DECLSPEC_UUID(x)
+#endif
diff --git a/test/test/CMakeLists.txt b/test/test/CMakeLists.txt
new file mode 100644
index 000000000..f5921a0bc
--- /dev/null
+++ b/test/test/CMakeLists.txt
@@ -0,0 +1,71 @@
+file(GLOB TEST_SRCS
+    LIST_DIRECTORIES false
+    CONFIGURE_DEPENDS
+    *.cpp
+)
+list(FILTER TEST_SRCS EXCLUDE REGEX "/(main|pch)\\.cpp")
+
+
+# We can't build test_component[*] for mingw-w64 because it doesn't have an
+# alternative to midl that can produce winmd files. Also, even if we do manage
+# to reuse the MSVC-compiled binaries, mingw-w64 is still missing
+# windowsnumerics.impl.h which is needed to provide the types
+# winrt::Windows::Foundation::Numerics::float2 and friends that the components
+# use.
+list(APPEND BROKEN_TESTS
+    agility
+    delegates
+    enum
+    event_deferral
+    in_params
+    in_params_abi
+    no_make_detection
+    noexcept
+    optional
+    out_params
+    out_params_abi
+    parent_includes
+    rational
+    return_params
+    return_params_abi
+    struct_delegate
+    structs
+    uniform_in_params
+    velocity
+)
+
+list(APPEND BROKEN_TESTS
+    # depends on pplawait.h
+    when
+)
+
+# Exclude broken tests
+foreach(TEST_SRCS_EXCLUDE_ITEM IN LISTS BROKEN_TESTS)
+    list(FILTER TEST_SRCS EXCLUDE REGEX "/${TEST_SRCS_EXCLUDE_ITEM}\\.cpp")
+endforeach()
+
+add_executable(test-vanilla main.cpp ${TEST_SRCS})
+set_target_properties(test-vanilla PROPERTIES OUTPUT_NAME "test")
+target_link_libraries(test-vanilla runtimeobject)
+
+target_precompile_headers(test-vanilla PRIVATE pch.h)
+set_source_files_properties(
+    main.cpp
+    coro_foundation.cpp
+    coro_system.cpp
+    coro_threadpool.cpp
+    coro_uicore.cpp
+    custom_activation.cpp
+    generic_type_names.cpp
+    guid_include.cpp
+    inspectable_interop.cpp
+    module_lock_dll.cpp
+    PROPERTIES SKIP_PRECOMPILE_HEADERS true
+)
+
+add_dependencies(test-vanilla build-cppwinrt-projection)
+
+add_test(
+    NAME test
+    COMMAND "$<TARGET_FILE:test-vanilla>"
+)
diff --git a/test/test/async_auto_cancel.cpp b/test/test/async_auto_cancel.cpp
index ef5ce2aa3..bffcb6e44 100644
--- a/test/test/async_auto_cancel.cpp
+++ b/test/test/async_auto_cancel.cpp
@@ -83,7 +83,7 @@ namespace
     }
 }
 
-#if defined(__clang__)
+#if defined(__clang__) && defined(_MSC_VER)
 // FIXME: Test is known to segfault when built with Clang.
 TEST_CASE("async_auto_cancel", "[.clang-crash]")
 #else
diff --git a/test/test/async_cancel_callback.cpp b/test/test/async_cancel_callback.cpp
index 98a08ff99..c99e1dad4 100644
--- a/test/test/async_cancel_callback.cpp
+++ b/test/test/async_cancel_callback.cpp
@@ -93,7 +93,7 @@ namespace
     }
 }
 
-#if defined(__clang__)
+#if defined(__clang__) && defined(_MSC_VER)
 // FIXME: Test is known to segfault when built with Clang.
 TEST_CASE("async_cancel_callback", "[.clang-crash]")
 #else
diff --git a/test/test/async_check_cancel.cpp b/test/test/async_check_cancel.cpp
index fb661d8c8..7547609f6 100644
--- a/test/test/async_check_cancel.cpp
+++ b/test/test/async_check_cancel.cpp
@@ -104,7 +104,7 @@ namespace
     }
 }
 
-#if defined(__clang__)
+#if defined(__clang__) && defined(_MSC_VER)
 // FIXME: Test is known to segfault when built with Clang.
 TEST_CASE("async_check_cancel", "[.clang-crash]")
 #else
diff --git a/test/test/async_propagate_cancel.cpp b/test/test/async_propagate_cancel.cpp
index 2739897ff..a3e5af749 100644
--- a/test/test/async_propagate_cancel.cpp
+++ b/test/test/async_propagate_cancel.cpp
@@ -128,7 +128,7 @@ namespace
     }
 }
 
-#if defined(__clang__)
+#if defined(__clang__) && defined(_MSC_VER)
 // FIXME: Test is known to segfault when built with Clang.
 TEST_CASE("async_propagate_cancel", "[.clang-crash]")
 #else
diff --git a/test/test/async_throw.cpp b/test/test/async_throw.cpp
index bca1e9b26..779351439 100644
--- a/test/test/async_throw.cpp
+++ b/test/test/async_throw.cpp
@@ -77,7 +77,7 @@ namespace
     }
 }
 
-#if defined(__clang__)
+#if defined(__clang__) && defined(_MSC_VER)
 // FIXME: Test is known to segfault when built with Clang.
 TEST_CASE("async_throw", "[.clang-crash]")
 #else
diff --git a/test/test/async_wait_for.cpp b/test/test/async_wait_for.cpp
index d25664495..d7613083c 100644
--- a/test/test/async_wait_for.cpp
+++ b/test/test/async_wait_for.cpp
@@ -96,7 +96,7 @@ namespace
     }
 }
 
-#if defined(__clang__)
+#if defined(__clang__) && defined(_MSC_VER)
 // FIXME: Test is known to segfault when built with Clang.
 TEST_CASE("async_wait_for", "[.clang-crash]")
 #else
diff --git a/test/test/await_adapter.cpp b/test/test/await_adapter.cpp
index 15a179e49..809567695 100644
--- a/test/test/await_adapter.cpp
+++ b/test/test/await_adapter.cpp
@@ -93,7 +93,7 @@ namespace
     }
 }
 
-#if defined(__clang__) && (defined(_M_IX86) || defined(__i386__))
+#if defined(__clang__) && defined(_MSC_VER) && (defined(_M_IX86) || defined(__i386__))
 // FIXME: Test is known to segfault on x86 when built with Clang.
 TEST_CASE("await_adapter", "[.clang-crash]")
 #else
diff --git a/test/test/box_array.cpp b/test/test/box_array.cpp
index 1c5b4a966..04377b334 100644
--- a/test/test/box_array.cpp
+++ b/test/test/box_array.cpp
@@ -8,17 +8,17 @@ namespace
         T defaultValue{};
         winrt::com_array<T> ary{ otherValue, defaultValue };
         auto box = winrt::box_value(ary);
-        winrt::com_array<T> unbox = box.try_as<winrt::com_array<T>>().value();
+        winrt::com_array<T> unbox = box.template try_as<winrt::com_array<T>>().value();
         REQUIRE(unbox.size() == 2);
         REQUIRE(unbox.at(0) == otherValue);
         REQUIRE(unbox.at(1) == defaultValue);
-        unbox = box.as<winrt::com_array<T>>();
+        unbox = box.template as<winrt::com_array<T>>();
         REQUIRE(unbox.size() == 2);
         REQUIRE(unbox.at(0) == otherValue);
         REQUIRE(unbox.at(1) == defaultValue);
         if constexpr (!std::is_same_v<T, GUID>)
         {
-            unbox = box.as<winrt::optional<winrt::com_array<T>>>().Value();
+            unbox = box.template as<winrt::optional<winrt::com_array<T>>>().Value();
             REQUIRE(unbox.size() == 2);
             REQUIRE(unbox.at(0) == otherValue);
             REQUIRE(unbox.at(1) == defaultValue);
@@ -53,4 +53,4 @@ TEST_CASE("box_array")
     Verify<winrt::Windows::Foundation::Point>({ 1,1 });
     Verify<winrt::Windows::Foundation::Size>({ 1,1 });
     Verify<winrt::Windows::Foundation::Rect>({ 1,1,1,1 });
-}
\ No newline at end of file
+}
diff --git a/test/test/capture.cpp b/test/test/capture.cpp
index 8c75681b4..9019d1e34 100644
--- a/test/test/capture.cpp
+++ b/test/test/capture.cpp
@@ -3,12 +3,16 @@
 using namespace winrt;
 using namespace Windows::Foundation;
 
-struct __declspec(uuid("5fb96f8d-409c-42a9-99a7-8a95c1459dbd")) ICapture : ::IUnknown
+struct DECLSPEC_UUID("5fb96f8d-409c-42a9-99a7-8a95c1459dbd") ICapture : ::IUnknown
 {
     virtual int32_t __stdcall GetValue() noexcept = 0;
     virtual int32_t __stdcall CreateMemberCapture(int32_t value, GUID const& iid, void** object) noexcept = 0;
 };
 
+#ifdef __CRT_UUID_DECL
+__CRT_UUID_DECL(ICapture, 0x5fb96f8d, 0x409c, 0x42a9, 0x99, 0xa7, 0x8a, 0x95, 0xc1, 0x45, 0x9d, 0xbd)
+#endif
+
 struct Capture : implements<Capture, ICapture, IStringable>
 {
     int32_t const m_value{};
diff --git a/test/test/disconnected.cpp b/test/test/disconnected.cpp
index ac97f8477..13fcad601 100644
--- a/test/test/disconnected.cpp
+++ b/test/test/disconnected.cpp
@@ -171,6 +171,12 @@ struct non_agile_abandoned_action : implements<non_agile_abandoned_action, IAsyn
     delegate<> m_disconnect;
 };
 
+// Not yet buildable on mingw-w64.
+// Missing CLSID_ContextSwitcher, IID_ICallbackWithNoReentrancyToApplicationSTA
+// and __uuidof(IContextCallback). Also, the lambda needs to have __stdcall
+// specified on it but there is a Clang crash bug blocking this:
+// https://github.com/llvm/llvm-project/issues/58366
+#if !defined(__MINGW32__)
 namespace
 {
     template<typename TLambda>
@@ -285,3 +291,4 @@ TEST_CASE("disconnected,double")
 
     test.get();
 }
+#endif
diff --git a/test/test/generic_type_names.cpp b/test/test/generic_type_names.cpp
index 580d69ac3..5a2d648a2 100644
--- a/test/test/generic_type_names.cpp
+++ b/test/test/generic_type_names.cpp
@@ -120,6 +120,7 @@ TEST_CASE("generic_type_names")
         IReference<Rect>);
     REQUIRE_EQUAL_NAME(L"Windows.Foundation.IReference`1<Windows.Foundation.Size>",
         IReference<Size>);
+#if __has_include(<windowsnumerics.impl.h>)
     REQUIRE_EQUAL_NAME(L"Windows.Foundation.IReference`1<Windows.Foundation.Numerics.Vector2>",
         IReference<float2>);
     REQUIRE_EQUAL_NAME(L"Windows.Foundation.IReference`1<Windows.Foundation.Numerics.Vector3>",
@@ -134,6 +135,7 @@ TEST_CASE("generic_type_names")
         IReference<quaternion>);
     REQUIRE_EQUAL_NAME(L"Windows.Foundation.IReference`1<Windows.Foundation.Numerics.Plane>",
         IReference<plane>);
+#endif
 
     // Enums, structs, IInspectable, classes, and delegates
 
diff --git a/test/test/generic_types.h b/test/test/generic_types.h
index d96b3bbfe..5ddba76d9 100644
--- a/test/test/generic_types.h
+++ b/test/test/generic_types.h
@@ -3,7 +3,9 @@
 using namespace winrt;
 using namespace Windows::Foundation;
 using namespace Windows::Foundation::Collections;
+#if __has_include(<windowsnumerics.impl.h>)
 using namespace Windows::Foundation::Numerics;
+#endif
 using namespace std::literals;
 
 #define REQUIRE_EQUAL_GUID(left, ...) STATIC_REQUIRE(equal(guid(left), guid_of<__VA_ARGS__>()));
@@ -92,6 +94,7 @@ namespace
         REQUIRE_EQUAL_GUID("84F14C22-A00A-5272-8D3D-82112E66DF00", IReference<Point>);
         REQUIRE_EQUAL_GUID("80423F11-054F-5EAC-AFD3-63B6CE15E77B", IReference<Rect>);
         REQUIRE_EQUAL_GUID("61723086-8e53-5276-9f36-2a4bb93e2b75", IReference<Size>);
+#if __has_include(<windowsnumerics.impl.h>)
         REQUIRE_EQUAL_GUID("48F6A69E-8465-57AE-9400-9764087F65AD", IReference<float2>);
         REQUIRE_EQUAL_GUID("1EE770FF-C954-59CA-A754-6199A9BE282C", IReference<float3>);
         REQUIRE_EQUAL_GUID("A5E843C9-ED20-5339-8F8D-9FE404CF3654", IReference<float4>);
@@ -99,6 +102,7 @@ namespace
         REQUIRE_EQUAL_GUID("DACBFFDC-68EF-5FD0-B657-782D0AC9807E", IReference<float4x4>);
         REQUIRE_EQUAL_GUID("B27004BB-C014-5DCE-9A21-799C5A3C1461", IReference<quaternion>);
         REQUIRE_EQUAL_GUID("46D542A1-52F7-58E7-ACFC-9A6D364DA022", IReference<plane>);
+#endif
 
         // Enums, structs, IInspectable, classes, and delegates
 
diff --git a/test/test/initialize.cpp b/test/test/initialize.cpp
index dbd95c3fe..e5532fe2d 100644
--- a/test/test/initialize.cpp
+++ b/test/test/initialize.cpp
@@ -5,11 +5,11 @@ using namespace Windows::Foundation;
 
 namespace
 {
-    class some_exception : public std::exception
+    class some_exception : public std::runtime_error
     {
     public:
         some_exception() noexcept
-            : exception("some_exception", 1)
+            : runtime_error("some_exception")
         {
         }
     };
diff --git a/test/test/inspectable_interop.cpp b/test/test/inspectable_interop.cpp
index d693a6062..bfe46d041 100644
--- a/test/test/inspectable_interop.cpp
+++ b/test/test/inspectable_interop.cpp
@@ -1,3 +1,4 @@
+#include "mingw_com_support.h"
 #include <inspectable.h>
 #include "winrt/Windows.Foundation.h"
 #include "catch.hpp"
@@ -6,11 +7,18 @@ using namespace winrt;
 
 namespace
 {
-    struct __declspec(uuid("ed0dd761-c31e-4803-8cf9-22a2cb20ec47")) IBadInterop : ::IInspectable
+    struct DECLSPEC_UUID("ed0dd761-c31e-4803-8cf9-22a2cb20ec47") IBadInterop : ::IInspectable
     {
         virtual int32_t __stdcall JustSayNo() noexcept = 0;
     };
+}
+
+#ifdef __CRT_UUID_DECL
+__CRT_UUID_DECL(IBadInterop, 0xed0dd761, 0xc31e, 0x4803, 0x8c, 0xf9, 0x22, 0xa2, 0xcb, 0x20, 0xec, 0x47)
+#endif
 
+namespace
+{
     struct Sample : implements<Sample, Windows::Foundation::IActivationFactory, IBadInterop>
     {
         Windows::Foundation::IInspectable ActivateInstance()
diff --git a/test/test/interop.cpp b/test/test/interop.cpp
index 9ca4c94ea..ec5476d15 100644
--- a/test/test/interop.cpp
+++ b/test/test/interop.cpp
@@ -1,18 +1,24 @@
 #include "pch.h"
 #include <inspectable.h>
 
-struct __declspec(uuid("5040a5f4-796a-42ff-9f06-be89137a518f")) IBase : IUnknown
+struct DECLSPEC_UUID("5040a5f4-796a-42ff-9f06-be89137a518f") IBase : IUnknown
 {
 };
 
-struct __declspec(uuid("529fed32-514f-4150-b1ba-15b47df700b7")) IDerived : IBase
+struct DECLSPEC_UUID("529fed32-514f-4150-b1ba-15b47df700b7") IDerived : IBase
 {
 };
 
-struct __declspec(uuid("b81fb2a2-eab4-488a-96a7-434873c2c20b")) IMoreDerived : IDerived
+struct DECLSPEC_UUID("b81fb2a2-eab4-488a-96a7-434873c2c20b") IMoreDerived : IDerived
 {
 };
 
+#ifdef __CRT_UUID_DECL
+__CRT_UUID_DECL(IBase, 0x5040a5f4, 0x796a, 0x42ff, 0x9f, 0x06, 0xbe, 0x89, 0x13, 0x7a, 0x51, 0x8f)
+__CRT_UUID_DECL(IDerived, 0x529fed32, 0x514f, 0x4150, 0xb1, 0xba, 0x15, 0xb4, 0x7d, 0xf7, 0x00, 0xb7)
+__CRT_UUID_DECL(IMoreDerived, 0xb81fb2a2, 0xeab4, 0x488a, 0x96, 0xa7, 0x43, 0x48, 0x73, 0xc2, 0xc2, 0x0b)
+#endif
+
 namespace winrt
 {
     template<> bool is_guid_of<IDerived>(guid const& id) noexcept
diff --git a/test/test/main.cpp b/test/test/main.cpp
index cb2203171..10150c369 100644
--- a/test/test/main.cpp
+++ b/test/test/main.cpp
@@ -1,5 +1,9 @@
 #include <crtdbg.h>
 #define CATCH_CONFIG_RUNNER
+
+// Force reportFatal to be available on mingw-w64
+#define CATCH_CONFIG_WINDOWS_SEH
+
 #include "catch.hpp"
 #include "winrt/base.h"
 
diff --git a/test/test/notify_awaiter.cpp b/test/test/notify_awaiter.cpp
index de2c5f1ab..0305e5a23 100644
--- a/test/test/notify_awaiter.cpp
+++ b/test/test/notify_awaiter.cpp
@@ -144,6 +144,14 @@ namespace
     }
 }
 
+// GNUC does not support MSVC extension lambda call convention conversion
+// https://devblogs.microsoft.com/oldnewthing/20150220-00/?p=44623
+#if defined(__GNUC__)
+#define LAMBDA_STDCALL __attribute__((stdcall))
+#else
+#define LAMBDA_STDCALL
+#endif
+
 TEST_CASE("notify_awaiter")
 {
     // Everything works fine when nobody is watching.
@@ -156,12 +164,12 @@ TEST_CASE("notify_awaiter")
 
     // Hook up some watchers.
 
-    winrt_suspend_handler = [](void const* token) noexcept
+    winrt_suspend_handler = [](void const* token) LAMBDA_STDCALL noexcept
     {
         watcher.push_back({ token, notification::suspend });
     };
 
-    winrt_resume_handler = [](void const* token) noexcept
+    winrt_resume_handler = [](void const* token) LAMBDA_STDCALL noexcept
     {
         auto last = watcher.back();
         REQUIRE(last.first == token);
diff --git a/test/test/numerics.cpp b/test/test/numerics.cpp
index cfc73c0dd..23b2dfb34 100644
--- a/test/test/numerics.cpp
+++ b/test/test/numerics.cpp
@@ -5,9 +5,11 @@ using namespace Windows::Foundation::Numerics;
 
 TEST_CASE("numerics")
 {
+#if __has_include(<windowsnumerics.impl.h>)
     // Basic smoke test exercising SIMD intrinsics used by numerics.
 
     auto one = float4::one();
 
     REQUIRE(one * one == one);
+#endif
 }
diff --git a/test/test/pch.h b/test/test/pch.h
index 65588aec3..24d65c225 100644
--- a/test/test/pch.h
+++ b/test/test/pch.h
@@ -2,6 +2,8 @@
 
 #pragma warning(4: 4458) // ensure we compile clean with this warning enabled
 
+#include "mingw_com_support.h"
+
 #define WINRT_LEAN_AND_MEAN
 #include <unknwn.h>
 #include "winrt/Windows.Foundation.Collections.h"
diff --git a/test/test/variadic_delegate.cpp b/test/test/variadic_delegate.cpp
index a4d0c4a80..6ffbe5ef4 100644
--- a/test/test/variadic_delegate.cpp
+++ b/test/test/variadic_delegate.cpp
@@ -150,7 +150,7 @@ TEST_CASE("variadic_delegate")
 
     // Exception
     {
-        delegate<> d = [] { throw std::exception("what"); };
+        delegate<> d = [] { throw std::runtime_error("what"); };
         REQUIRE_THROWS_AS(d(), std::exception);
     }
 
diff --git a/test/test_win7/CMakeLists.txt b/test/test_win7/CMakeLists.txt
new file mode 100644
index 000000000..7ada247c4
--- /dev/null
+++ b/test/test_win7/CMakeLists.txt
@@ -0,0 +1,58 @@
+file(GLOB TEST_SRCS
+    LIST_DIRECTORIES false
+    CONFIGURE_DEPENDS
+    *.cpp
+)
+list(FILTER TEST_SRCS EXCLUDE REGEX "/(main|pch)\\.cpp")
+
+
+# We can't build test_component[*] for mingw-w64 because it doesn't have an
+# alternative to midl that can produce winmd files. Also, even if we do manage
+# to reuse the MSVC-compiled binaries, mingw-w64 is still missing
+# windowsnumerics.impl.h which is needed to provide the types
+# winrt::Windows::Foundation::Numerics::float2 and friends that the components
+# use.
+list(APPEND BROKEN_TESTS
+    agility
+    delegates
+    enum
+    in_params
+    no_make_detection
+    noexcept
+    out_params
+    parent_includes
+    return_params
+    structs
+    uniform_in_params
+    velocity
+)
+
+list(APPEND BROKEN_TESTS
+    # depends on pplawait.h
+    when
+)
+
+# Exclude broken tests
+foreach(TEST_SRCS_EXCLUDE_ITEM IN LISTS BROKEN_TESTS)
+    list(FILTER TEST_SRCS EXCLUDE REGEX "/${TEST_SRCS_EXCLUDE_ITEM}\\.cpp")
+endforeach()
+
+add_executable(test_win7 main.cpp ${TEST_SRCS})
+
+target_precompile_headers(test_win7 PRIVATE pch.h)
+set_source_files_properties(
+    main.cpp
+    coro_foundation.cpp
+    coro_threadpool.cpp
+    generic_type_names.cpp
+    inspectable_interop.cpp
+    module_lock_dll.cpp
+    PROPERTIES SKIP_PRECOMPILE_HEADERS true
+)
+
+add_dependencies(test_win7 build-cppwinrt-projection)
+
+add_test(
+    NAME test_win7
+    COMMAND "$<TARGET_FILE:test_win7>"
+)
diff --git a/test/test_win7/capture.cpp b/test/test_win7/capture.cpp
index 8c75681b4..9019d1e34 100644
--- a/test/test_win7/capture.cpp
+++ b/test/test_win7/capture.cpp
@@ -3,12 +3,16 @@
 using namespace winrt;
 using namespace Windows::Foundation;
 
-struct __declspec(uuid("5fb96f8d-409c-42a9-99a7-8a95c1459dbd")) ICapture : ::IUnknown
+struct DECLSPEC_UUID("5fb96f8d-409c-42a9-99a7-8a95c1459dbd") ICapture : ::IUnknown
 {
     virtual int32_t __stdcall GetValue() noexcept = 0;
     virtual int32_t __stdcall CreateMemberCapture(int32_t value, GUID const& iid, void** object) noexcept = 0;
 };
 
+#ifdef __CRT_UUID_DECL
+__CRT_UUID_DECL(ICapture, 0x5fb96f8d, 0x409c, 0x42a9, 0x99, 0xa7, 0x8a, 0x95, 0xc1, 0x45, 0x9d, 0xbd)
+#endif
+
 struct Capture : implements<Capture, ICapture, IStringable>
 {
     int32_t const m_value{};
diff --git a/test/test_win7/generic_type_names.cpp b/test/test_win7/generic_type_names.cpp
index 580d69ac3..a91266a83 100644
--- a/test/test_win7/generic_type_names.cpp
+++ b/test/test_win7/generic_type_names.cpp
@@ -114,6 +114,7 @@ TEST_CASE("generic_type_names")
         IReference<TimeSpan>);
     REQUIRE_EQUAL_NAME(L"Windows.Foundation.IReference`1<Windows.Foundation.DateTime>",
         IReference<DateTime>);
+#if __has_include(<windowsnumerics.impl.h>)
     REQUIRE_EQUAL_NAME(L"Windows.Foundation.IReference`1<Windows.Foundation.Point>",
         IReference<Point>);
     REQUIRE_EQUAL_NAME(L"Windows.Foundation.IReference`1<Windows.Foundation.Rect>",
@@ -134,6 +135,7 @@ TEST_CASE("generic_type_names")
         IReference<quaternion>);
     REQUIRE_EQUAL_NAME(L"Windows.Foundation.IReference`1<Windows.Foundation.Numerics.Plane>",
         IReference<plane>);
+#endif
 
     // Enums, structs, IInspectable, classes, and delegates
 
diff --git a/test/test_win7/generic_types.h b/test/test_win7/generic_types.h
index d96b3bbfe..5ddba76d9 100644
--- a/test/test_win7/generic_types.h
+++ b/test/test_win7/generic_types.h
@@ -3,7 +3,9 @@
 using namespace winrt;
 using namespace Windows::Foundation;
 using namespace Windows::Foundation::Collections;
+#if __has_include(<windowsnumerics.impl.h>)
 using namespace Windows::Foundation::Numerics;
+#endif
 using namespace std::literals;
 
 #define REQUIRE_EQUAL_GUID(left, ...) STATIC_REQUIRE(equal(guid(left), guid_of<__VA_ARGS__>()));
@@ -92,6 +94,7 @@ namespace
         REQUIRE_EQUAL_GUID("84F14C22-A00A-5272-8D3D-82112E66DF00", IReference<Point>);
         REQUIRE_EQUAL_GUID("80423F11-054F-5EAC-AFD3-63B6CE15E77B", IReference<Rect>);
         REQUIRE_EQUAL_GUID("61723086-8e53-5276-9f36-2a4bb93e2b75", IReference<Size>);
+#if __has_include(<windowsnumerics.impl.h>)
         REQUIRE_EQUAL_GUID("48F6A69E-8465-57AE-9400-9764087F65AD", IReference<float2>);
         REQUIRE_EQUAL_GUID("1EE770FF-C954-59CA-A754-6199A9BE282C", IReference<float3>);
         REQUIRE_EQUAL_GUID("A5E843C9-ED20-5339-8F8D-9FE404CF3654", IReference<float4>);
@@ -99,6 +102,7 @@ namespace
         REQUIRE_EQUAL_GUID("DACBFFDC-68EF-5FD0-B657-782D0AC9807E", IReference<float4x4>);
         REQUIRE_EQUAL_GUID("B27004BB-C014-5DCE-9A21-799C5A3C1461", IReference<quaternion>);
         REQUIRE_EQUAL_GUID("46D542A1-52F7-58E7-ACFC-9A6D364DA022", IReference<plane>);
+#endif
 
         // Enums, structs, IInspectable, classes, and delegates
 
diff --git a/test/test_win7/inspectable_interop.cpp b/test/test_win7/inspectable_interop.cpp
index d693a6062..95ee35522 100644
--- a/test/test_win7/inspectable_interop.cpp
+++ b/test/test_win7/inspectable_interop.cpp
@@ -6,11 +6,18 @@ using namespace winrt;
 
 namespace
 {
-    struct __declspec(uuid("ed0dd761-c31e-4803-8cf9-22a2cb20ec47")) IBadInterop : ::IInspectable
+    struct DECLSPEC_UUID("ed0dd761-c31e-4803-8cf9-22a2cb20ec47") IBadInterop : ::IInspectable
     {
         virtual int32_t __stdcall JustSayNo() noexcept = 0;
     };
+}
+
+#ifdef __CRT_UUID_DECL
+__CRT_UUID_DECL(IBadInterop, 0xed0dd761, 0xc31e, 0x4803, 0x8c, 0xf9, 0x22, 0xa2, 0xcb, 0x20, 0xec, 0x47)
+#endif
 
+namespace
+{
     struct Sample : implements<Sample, Windows::Foundation::IActivationFactory, IBadInterop>
     {
         Windows::Foundation::IInspectable ActivateInstance()
diff --git a/test/test_win7/interop.cpp b/test/test_win7/interop.cpp
index 9ca4c94ea..ec5476d15 100644
--- a/test/test_win7/interop.cpp
+++ b/test/test_win7/interop.cpp
@@ -1,18 +1,24 @@
 #include "pch.h"
 #include <inspectable.h>
 
-struct __declspec(uuid("5040a5f4-796a-42ff-9f06-be89137a518f")) IBase : IUnknown
+struct DECLSPEC_UUID("5040a5f4-796a-42ff-9f06-be89137a518f") IBase : IUnknown
 {
 };
 
-struct __declspec(uuid("529fed32-514f-4150-b1ba-15b47df700b7")) IDerived : IBase
+struct DECLSPEC_UUID("529fed32-514f-4150-b1ba-15b47df700b7") IDerived : IBase
 {
 };
 
-struct __declspec(uuid("b81fb2a2-eab4-488a-96a7-434873c2c20b")) IMoreDerived : IDerived
+struct DECLSPEC_UUID("b81fb2a2-eab4-488a-96a7-434873c2c20b") IMoreDerived : IDerived
 {
 };
 
+#ifdef __CRT_UUID_DECL
+__CRT_UUID_DECL(IBase, 0x5040a5f4, 0x796a, 0x42ff, 0x9f, 0x06, 0xbe, 0x89, 0x13, 0x7a, 0x51, 0x8f)
+__CRT_UUID_DECL(IDerived, 0x529fed32, 0x514f, 0x4150, 0xb1, 0xba, 0x15, 0xb4, 0x7d, 0xf7, 0x00, 0xb7)
+__CRT_UUID_DECL(IMoreDerived, 0xb81fb2a2, 0xeab4, 0x488a, 0x96, 0xa7, 0x43, 0x48, 0x73, 0xc2, 0xc2, 0x0b)
+#endif
+
 namespace winrt
 {
     template<> bool is_guid_of<IDerived>(guid const& id) noexcept
diff --git a/test/test_win7/main.cpp b/test/test_win7/main.cpp
index cb2203171..10150c369 100644
--- a/test/test_win7/main.cpp
+++ b/test/test_win7/main.cpp
@@ -1,5 +1,9 @@
 #include <crtdbg.h>
 #define CATCH_CONFIG_RUNNER
+
+// Force reportFatal to be available on mingw-w64
+#define CATCH_CONFIG_WINDOWS_SEH
+
 #include "catch.hpp"
 #include "winrt/base.h"
 
diff --git a/test/test_win7/numerics.cpp b/test/test_win7/numerics.cpp
index cfc73c0dd..23b2dfb34 100644
--- a/test/test_win7/numerics.cpp
+++ b/test/test_win7/numerics.cpp
@@ -5,9 +5,11 @@ using namespace Windows::Foundation::Numerics;
 
 TEST_CASE("numerics")
 {
+#if __has_include(<windowsnumerics.impl.h>)
     // Basic smoke test exercising SIMD intrinsics used by numerics.
 
     auto one = float4::one();
 
     REQUIRE(one * one == one);
+#endif
 }
diff --git a/test/test_win7/pch.h b/test/test_win7/pch.h
index 1989286de..92e8caa96 100644
--- a/test/test_win7/pch.h
+++ b/test/test_win7/pch.h
@@ -1,5 +1,7 @@
 #pragma once
 
+#include "mingw_com_support.h"
+
 #define WINRT_LEAN_AND_MEAN
 #include <unknwn.h>
 #include "winrt/Windows.Foundation.Collections.h"