Proper cmake patching

DockerfileLinux

@@ -18,6 +18,10 @@ COPY out/linux* /prebuild
 #Copy additional natives
 COPY natives /natives
 
+#Copy cmake patching script
+COPY scripts/patch_cmake.py .
+COPY patch/CMakeLists.txt.patch .
+
 #Copy and launch run script
 COPY scripts/run_linux.sh .
 RUN chmod +x run_linux.sh

DockerfileWindows

@@ -2,6 +2,10 @@ FROM friwidev/jcefdocker:windows-latest
 
 WORKDIR C:/
 
+#Copy cmake patching script
+COPY scripts/patch_cmake.py .
+COPY patch/CMakeLists.txt.patch .
+
 #Copy and launch run script
 COPY scripts/run_windows.bat .
 ENTRYPOINT ["run_windows.bat"]

patch/CMakeLists.txt.patch

@@ -0,0 +1,44 @@
+# Determine the platform.
+if("${CMAKE_SYSTEM_NAME}" STREQUAL "Darwin")
+  if("${PROJECT_ARCH}" STREQUAL "arm64")
+    set(CEF_PLATFORM "macosarm64")
+  else()
+    set(CEF_PLATFORM "macosx64")
+  endif()
+elseif("${CMAKE_SYSTEM_NAME}" STREQUAL "Linux")
+  if("${PROJECT_ARCH}" STREQUAL "amd64")
+    set(CEF_PLATFORM "linux64")
+  elseif("${PROJECT_ARCH}" STREQUAL "arm64")
+    set(CEF_PLATFORM "linuxarm64")
+  elseif("${PROJECT_ARCH}" STREQUAL "arm/v6")
+    set(CEF_PLATFORM "linuxarm")
+  else()
+    set(CEF_PLATFORM "linux32")
+  endif()
+elseif("${CMAKE_SYSTEM_NAME}" STREQUAL "Windows")
+  #Stolen from Jetbrains jcef repository for the arm64 windows build
+  if(MSVC)
+    include(CheckSymbolExists)
+
+    # MSVC predefines _M_ARM64 for compilations that target ARM64
+    # and _M_AMD64 for compilations that target x86_64.
+    check_symbol_exists("_M_ARM64" "" CEF_PLATFORM_WINARM64)
+    check_symbol_exists("_M_AMD64" "" CEF_PLATFORM_WIN64)
+
+    # We also should set PROJECT_ARCH explicitly because FindCEF.cmake deduces it incorrectly for
+    # cross-compilation cases.
+    if(CEF_PLATFORM_WINARM64)
+      set(CEF_PLATFORM "windowsarm64")
+      set(PROJECT_ARCH "arm64")
+    elseif(CEF_PLATFORM_WIN64)
+      set(CEF_PLATFORM "windows64")
+      set(PROJECT_ARCH "x86_64")
+    else()
+      set(CEF_PLATFORM "windows32")
+      set(PROJECT_ARCH "x86")
+    endif()
+  else()
+    message(FATAL_ERROR "Building JCEF for Windows using non-MSVC compiler is not supported.")
+  endif()
+endif()
+