msys2 · Kreijstal · Jun 19, 2026
diff --git a/mingw-w64-qt6-webengine-thirdparty/0001-cmake-configure-fixes.patch b/mingw-w64-qt6-webengine-thirdparty/0001-cmake-configure-fixes.patch
@@ -0,0 +1,353 @@
+diff --git a/configure.cmake b/configure.cmake
+index 931071f..13e6498 100644
+--- a/configure.cmake
++++ b/configure.cmake
+@@ -31,7 +31,9 @@ qt_webengine_set_version(libavutil 58.29.100)
+ qt_webengine_set_version(libavcodec 60.31.102)
+ qt_webengine_set_version(libavformat 60.16.100)
+ qt_webengine_set_version(openh264 2.4.1)
++if(NOT MINGW)
+ qt_webengine_set_version(windows_sdk 26100) # we only care about minor number "10.0.26100.0"
++endif()
+
+
+ #### find_package checks
+@@ -428,6 +430,8 @@ qt_webengine_configure_check("compiler"
+     CONDITION MSVC OR
+         (LINUX AND CMAKE_CXX_COMPILER_ID STREQUAL "GNU") OR
+         (LINUX AND CMAKE_CXX_COMPILER_ID STREQUAL "Clang") OR
++        (MINGW AND CMAKE_CXX_COMPILER_ID STREQUAL "GNU") OR
++        (MINGW AND CMAKE_CXX_COMPILER_ID STREQUAL "Clang") OR
+         (MACOS AND CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang")
+     MESSAGE
+         "${CMAKE_CXX_COMPILER_ID} compiler is not supported."
+@@ -511,20 +515,20 @@ qt_webengine_configure_check("android-ndk-api-level"
+     TAGS ANDROID_PALTFORM
+ )
+
+-if(WIN32)
++if(MSVC)
+     qt_webengine_get_windows_sdk_version(windows_sdk_version sdk_minor)
+     message("-- Windows 10 SDK version: ${windows_sdk_version}")
+     unset(windows_sdk_version)
+-endif()
+
+-qt_webengine_configure_check("windows-sdk"
+-    MODULES QtWebEngine
+-    CONDITION NOT WIN32 OR sdk_minor GREATER_EQUAL ${QT_CONFIGURE_CHECK_windows_sdk_version}
+-    MESSAGE "Build requires Windows 11 SDK at least version 10.0.${QT_CONFIGURE_CHECK_windows_sdk_version}.0"
+-    DOCUMENTATION "Windows 11 SDK at least version 10.0.${QT_CONFIGURE_CHECK_windows_sdk_version}.0"
+-    TAGS WINDOWS_PLATFORM
+-)
+-unset(sdk_minor)
++    qt_webengine_configure_check("windows-sdk"
++        MODULES QtWebEngine
++        CONDITION NOT WIN32 OR sdk_minor GREATER_EQUAL ${QT_CONFIGURE_CHECK_windows_sdk_version}
++        MESSAGE "Build requires Windows 11 SDK at least version 10.0.${QT_CONFIGURE_CHECK_windows_sdk_version}.0"
++        DOCUMENTATION "Windows 11 SDK at least version 10.0.${QT_CONFIGURE_CHECK_windows_sdk_version}.0"
++        TAGS WINDOWS_PLATFORM
++    )
++    unset(sdk_minor)
++endif()
+
+ ### Support Checks (optional)
+
+@@ -644,19 +648,19 @@ qt_feature("webengine-system-re2" PRIVATE
+ qt_feature("webengine-system-icu" PRIVATE
+     LABEL "icu"
+     AUTODETECT FALSE
+-    CONDITION UNIX AND ICU_FOUND
++    CONDITION (UNIX OR MINGW) AND ICU_FOUND
+ )
+ qt_feature("webengine-system-libwebp" PRIVATE
+     LABEL "libwebp, libwebpmux and libwebpdemux"
+-    CONDITION UNIX AND WEBP_FOUND
++    CONDITION (UNIX OR MINGW) AND WEBP_FOUND
+ )
+ qt_feature("webengine-system-libopenjpeg2" PRIVATE
+     LABEL "libopenjpeg2"
+-    CONDITION UNIX AND LIBOPENJP2_FOUND
++    CONDITION (UNIX OR MINGW) AND LIBOPENJP2_FOUND
+ )
+ qt_feature("webengine-system-opus" PRIVATE
+     LABEL "opus"
+-    CONDITION UNIX AND OPUS_FOUND
++    CONDITION (UNIX OR MINGW) AND OPUS_FOUND
+ )
+ qt_feature("webengine-system-ffmpeg" PRIVATE
+     LABEL "ffmpeg"
+@@ -666,11 +670,11 @@ qt_feature("webengine-system-ffmpeg" PRIVATE
+ qt_feature("webengine-system-libvpx" PRIVATE
+     LABEL "libvpx"
+     AUTODETECT FALSE
+-    CONDITION UNIX AND TEST_vpx
++    CONDITION (UNIX OR MINGW) AND TEST_vpx
+ )
+ qt_feature("webengine-system-snappy" PRIVATE
+     LABEL "snappy"
+-    CONDITION UNIX AND TEST_webengine_system_snappy
++    CONDITION (UNIX OR MINGW) AND TEST_webengine_system_snappy
+ )
+ qt_feature("webengine-system-glib" PRIVATE
+     LABEL "glib"
+@@ -678,7 +682,7 @@ qt_feature("webengine-system-glib" PRIVATE
+ )
+ qt_feature("webengine-system-zlib" PRIVATE
+     LABEL "zlib"
+-    CONDITION UNIX AND QT_FEATURE_system_zlib AND ZLIB_FOUND
++    CONDITION (UNIX OR MINGW) AND QT_FEATURE_system_zlib AND ZLIB_FOUND
+ )
+ qt_feature("webengine-qt-zlib" PRIVATE
+     LABEL "qtzlib"
+@@ -688,23 +692,23 @@ qt_feature("webengine-qt-zlib" PRIVATE
+ )
+ qt_feature("webengine-system-minizip" PRIVATE
+     LABEL "minizip"
+-    CONDITION UNIX AND MINIZIP_FOUND
++    CONDITION (UNIX OR MINGW) AND MINIZIP_FOUND
+ )
+ qt_feature("webengine-system-libxml" PRIVATE
+     LABEL "libxml2 and libxslt"
+-    CONDITION UNIX AND LIBXML2_FOUND
++    CONDITION (UNIX OR MINGW) AND LIBXML2_FOUND
+ )
+ qt_feature("webengine-system-lcms2" PRIVATE
+     LABEL "lcms2"
+-    CONDITION UNIX AND LCMS2_FOUND
++    CONDITION (UNIX OR MINGW) AND LCMS2_FOUND
+ )
+ qt_feature("webengine-system-libpng" PRIVATE
+     LABEL "png"
+-    CONDITION UNIX AND TARGET Qt::Gui AND PNG_FOUND AND QT_FEATURE_system_png
++    CONDITION (UNIX OR MINGW) AND TARGET Qt::Gui AND PNG_FOUND AND QT_FEATURE_system_png
+ )
+ qt_feature("webengine-system-libtiff" PRIVATE
+     LABEL "tiff"
+-    CONDITION UNIX AND TARGET Qt::Gui AND TIFF_FOUND
++    CONDITION (UNIX OR MINGW) AND TARGET Qt::Gui AND TIFF_FOUND
+ )
+ qt_feature("webengine-qt-libpng" PRIVATE
+     LABEL "qtpng"
+@@ -715,7 +719,7 @@ qt_feature("webengine-qt-libpng" PRIVATE
+ )
+ qt_feature("webengine-system-libjpeg" PRIVATE
+     LABEL "jpeg"
+-    CONDITION UNIX AND TARGET Qt::Gui AND TEST_jpeg AND QT_FEATURE_system_jpeg
++    CONDITION (UNIX OR MINGW) AND TARGET Qt::Gui AND TEST_jpeg AND QT_FEATURE_system_jpeg
+ )
+ qt_feature("webengine-qt-libjpeg" PRIVATE
+     LABEL "qtjpeg"
+@@ -726,7 +730,7 @@ qt_feature("webengine-qt-libjpeg" PRIVATE
+ )
+ qt_feature("webengine-system-harfbuzz" PRIVATE
+     LABEL "harfbuzz"
+-    CONDITION UNIX AND TARGET Qt::Gui AND HARFBUZZ_FOUND AND QT_FEATURE_system_harfbuzz
++    CONDITION (UNIX OR MINGW) AND TARGET Qt::Gui AND HARFBUZZ_FOUND AND QT_FEATURE_system_harfbuzz
+ )
+ qt_feature("webengine-qt-harfbuzz" PRIVATE
+     LABEL "qtharfbuzz"
+@@ -737,7 +741,7 @@ qt_feature("webengine-qt-harfbuzz" PRIVATE
+ )
+ qt_feature("webengine-system-freetype" PRIVATE
+     LABEL "freetype"
+-    CONDITION UNIX AND TARGET Qt::Gui AND TEST_freetype AND QT_FEATURE_system_freetype
++    CONDITION (UNIX OR MINGW) AND TARGET Qt::Gui AND TEST_freetype AND QT_FEATURE_system_freetype
+ )
+ qt_feature("webengine-qt-freetype" PRIVATE
+     LABEL "qtfreetype"
+@@ -758,7 +762,7 @@ qt_feature("webengine-system-libudev" PRIVATE
+
+ qt_feature("webengine-system-openh264" PRIVATE
+     LABEL "openh264"
+-    CONDITION UNIX AND OPENH264_FOUND
++    CONDITION (UNIX OR MINGW) AND OPENH264_FOUND
+ )
+
+ qt_feature("webengine-ozone-x11" PRIVATE
+@@ -795,7 +799,7 @@ qt_configure_add_summary_entry(ARGS "qtpdf-widgets-build")
+ qt_configure_add_summary_entry(ARGS "qtpdf-quick-build")
+ qt_configure_end_summary_section()
+ # >> Optional system libraries
+-if(UNIX)
++if(UNIX OR MINGW)
+     qt_configure_add_summary_section(NAME "Optional system libraries")
+     qt_configure_add_summary_entry(ARGS "webengine-system-re2")
+     qt_configure_add_summary_entry(ARGS "webengine-system-icu")
+diff --git a/cmake/QtToolchainHelpers.cmake b/cmake/QtToolchainHelpers.cmake
+index c692c78..7f8130a 100644
+--- a/cmake/QtToolchainHelpers.cmake
++++ b/cmake/QtToolchainHelpers.cmake
+@@ -553,9 +553,6 @@ macro(append_toolchain_setup)
+         list(APPEND gnArgArg target_cpu="${target_cpu}")
+         if(MINGW)
+             list(APPEND gnArgArg
+-                # note '/' prefix
+-                custom_toolchain="/${buildDir}/target_toolchain:target"
+-                host_toolchain="/${buildDir}/host_toolchain:host"
+                 host_cpu="${host_cpu}"
+             )
+         else()
+diff --git a/src/core/api/CMakeLists.txt b/src/core/api/CMakeLists.txt
+index 970c071..340fd7f 100644
+--- a/src/core/api/CMakeLists.txt
++++ b/src/core/api/CMakeLists.txt
+@@ -89,6 +89,7 @@ if(CLANG OR GCC)
+     target_compile_options(WebEngineCore PRIVATE
+         "-Wno-unused-parameter"
+         "-Wno-expansion-to-defined"
++        "-Wno-deprecated-declarations"
+     )
+ endif()
+
+diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
+index eb83a82..d636b2f 100644
+--- a/src/core/CMakeLists.txt
++++ b/src/core/CMakeLists.txt
+@@ -615,6 +615,54 @@ foreach(arch ${archs})
+             )
+         endif()
+
++        if(MINGW)
++            list(APPEND gnArgArg
++                angle_enable_vulkan=false
++                angle_shared_libvulkan=false
++                devtools_dcheck_always_on=true
++                icu_use_data_file=false
++                use_gio=false
++                use_glib=false
++                use_gtk=false
++                use_v8_context_snapshot=false
++                v8_enable_etw_stack_walking=false
++                v8_use_external_startup_data=false
++            )
++            set(systemLibs re2 libjpeg libpng freetype harfbuzz libwebp libxml
++                opus snappy icu ffmpeg lcms2 libopenjpeg2 libvpx
++            )
++            foreach(slib ${systemLibs})
++                extend_gn_list(gnArgArg
++                    ARGS use_system_${slib}
++                    CONDITION QT_FEATURE_webengine_system_${slib}
++                )
++            endforeach()
++            extend_gn_list(gnArgArg
++                ARGS use_system_libxslt
++                CONDITION QT_FEATURE_webengine_system_libxml
++            )
++            extend_gn_list(gnArgArg
++                ARGS use_system_zlib use_system_minizip
++                CONDITION QT_FEATURE_webengine_system_zlib AND QT_FEATURE_webengine_system_minizip
++            )
++            extend_gn_list(gnArgArg
++                ARGS pdfium_use_system_zlib
++                CONDITION QT_FEATURE_webengine_system_zlib
++            )
++            extend_gn_list(gnArgArg
++                ARGS pdfium_use_system_libpng
++                CONDITION QT_FEATURE_webengine_system_libpng
++            )
++            extend_gn_list(gnArgArg
++                ARGS pdfium_use_system_libtiff
++                CONDITION QT_FEATURE_webengine_system_libtiff
++            )
++            extend_gn_list(gnArgArg
++                ARGS rtc_system_openh264
++                CONDITION QT_FEATURE_webengine_system_openh264
++            )
++        endif()
++
+         add_gn_command(
+             CMAKE_TARGET WebEngineCore
+             NINJA_TARGETS QtWebEngineCore convert_dict
+diff --git a/src/core/configure/BUILD.root.gn.in b/src/core/configure/BUILD.root.gn.in
+index 0e611c2..c1965c7 100644
+--- a/src/core/configure/BUILD.root.gn.in
++++ b/src/core/configure/BUILD.root.gn.in
+@@ -78,6 +78,19 @@ config("QtWebEngineCore_config") {
+     @GN_INCLUDE_DIRS@,
+     rebase_path("${target_gen_dir}/.moc/")
+   ]
++
++  if (is_mingw) {
++    # Silenced warnings from skia headers.
++    cflags_cc += [ "-Wno-missing-field-initializers" ]
++
++    if (is_clang) {
++      cflags_cc += [
++        "-Wno-overloaded-virtual",
++        "-Wno-sometimes-uninitialized",
++        "-Wno-unused-private-field",
++      ]
++    }
++  }
+ }
+
+ declare_args() {
+@@ -91,7 +104,7 @@ config("embedded_config") {
+
+ config("cpp20_config") {
+   # Chromium is built with C++20
+-  if (is_win) {
++  if (is_msvc) {
+     cflags_cc = [ "/std:c++20" ]
+   } else if(is_gcc) {
+     cflags_cc = [ "-std=gnu++20" ]
+@@ -122,9 +135,12 @@ shared_library("QtWebEngineCore") {
+   rsp_types = [ "objects", "archives", "libs", "ldir"]
+   configs += [
+     ":cpp20_config",
+-    ":QtWebEngineCore_config",
+-    "//build/config:precompiled_headers"
++    ":QtWebEngineCore_config"
+   ]
++  if (!is_mingw) {
++    configs += [ "//build/config:precompiled_headers" ]
++  }
++
+   include_dirs = [
+     "//skia/config",
+     "//third_party",
+@@ -588,9 +604,11 @@ if (is_win) {
+   static_library("QtWebEngineCoreSandbox") {
+     complete_static_lib = true
+     configs += [ ":cpp20_config",
+-                 ":QtWebEngineCore_config",
+-                 "//build/config:precompiled_headers"
++                 ":QtWebEngineCore_config"
+     ]
++    if (!is_mingw) {
++      configs += [ "//build/config:precompiled_headers" ]
++    }
+     output_dir = "$root_out_dir"
+     sources = [
+       "@GN_SOURCE_ROOT@/sandbox_win.cpp"
+diff --git a/src/pdf/configure/BUILD.root.gn.in b/src/pdf/configure/BUILD.root.gn.in
+index e9f54ed..5033aa1 100644
+--- a/src/pdf/configure/BUILD.root.gn.in
++++ b/src/pdf/configure/BUILD.root.gn.in
+@@ -41,7 +41,7 @@ config("QtPdf_config") {
+
+ config("cpp20_config") {
+   # Chromium headers now use concepts and requires c++20
+-  if (is_win) {
++  if (is_msvc) {
+     cflags_cc = [ "/std:c++20" ]
+   } else {
+     cflags_cc = [ "-std=c++20" ]
+diff --git a/src/process/CMakeLists.txt b/src/process/CMakeLists.txt
+index 37bca3b..74d1616 100644
+--- a/src/process/CMakeLists.txt
++++ b/src/process/CMakeLists.txt
+@@ -33,8 +33,12 @@ if(WIN32)
+     set_property(TARGET ${qtWebEngineProcessName} PROPERTY WIN32_EXECUTABLE TRUE)
+     # get libs rsp file, since cmake is not aware of PUBLIC libs for WebEngineCore
+     get_target_property(libs_rsp WebEngineCore LIBS_RSP)
+     get_target_property(archives_rsp WebEngineCore ARCHIVES_RSP)
+-    target_link_options(${qtWebEngineProcessName} PRIVATE "@${libs_rsp}" "@${archives_rsp}" "/STACK:0x800000")
++    if(MSVC)
++        target_link_options(${qtWebEngineProcessName} PRIVATE "@${libs_rsp}" "@${archives_rsp}" "/STACK:0x800000")
++    else()
++        target_link_options(${qtWebEngineProcessName} PRIVATE "@${libs_rsp}" "@${archives_rsp}" "-Wl,--stack,800000")
++    endif()
+ endif()
+
+ if(MACOS)