CI: Attempt to fix build failure on windows

[M2-TE]

Window CI sometimes fails due to "permission errors":

Output

run VulkanHppGenerator
  clang-format version 18.1.8
  VulkanHppGenerator: Found VulkanHppGenerator: Loading D:\a\Vulkan-Hpp\Vulkan-Hpp\Vulkan-Headers\registry\vk.xml
  VulkanHppGenerator: Parsing D:\a\Vulkan-Hpp\Vulkan-Hpp\Vulkan-Headers\registry\vk.xml
  VulkanHppGenerator: Spec warning on line 642: enum <VkDeviceCreateFlagBits> not required in any feature or extension!
  VulkanHppGenerator: Spec warning on line 798: enum <VkImageFormatConstraintsFlagBitsFUCHSIA> not required in any feature or extension!
  VulkanHppGenerator: Spec warning on line 621: enum <VkQueryPoolCreateFlagBits> not required in any feature or extension!
  VulkanHppGenerator: Spec warning on line 700: enum <VkSemaphoreCreateFlagBits> not required in any feature or extension!
  VulkanHppGenerator: Spec warning on line 777: enum <VkShaderModuleCreateFlagBits> not required in any feature or extension!
CUSTOMBUILD : clang-format error : unable to overwrite file D:/a/Vulkan-Hpp/Vulkan-Hpp/vulkan/vulkan.cppm: permission denied [D:\a\Vulkan-Hpp\Vulkan-Hpp\build\11\Debug\build_vulkan_hpp.vcxproj]
  VulkanHppGenerator: Generating D:/a/Vulkan-Hpp/Vulkan-Hpp/vulkan/vulkan.cppm ...
  VulkanHppGenerator: Generating D:/a/Vulkan-Hpp/Vulkan-Hpp/vulkan/vulkan.hpp ...
  VulkanHppGenerator: Generating D:/a/Vulkan-Hpp/Vulkan-Hpp/vulkan/vulkan_enums.hpp ...
  VulkanHppGenerator: Generating D:/a/Vulkan-Hpp/Vulkan-Hpp/vulkan/vulkan_extension_inspection.hpp ...
  VulkanHppGenerator: Formatting D:/a/Vulkan-Hpp/Vulkan-Hpp/vulkan/vulkan_extension_inspection.hpp ...
  VulkanHppGenerator: Generating D:/a/Vulkan-Hpp/Vulkan-Hpp/vulkan/vulkan_format_traits.hpp ...
  VulkanHppGenerator: Generating D:/a/Vulkan-Hpp/Vulkan-Hpp/vulkan/vulkan_funcs.hpp ...
  VulkanHppGenerator: Generating D:/a/Vulkan-Hpp/Vulkan-Hpp/vulkan/vulkan_handles.hpp ...
  VulkanHppGenerator: Generating D:/a/Vulkan-Hpp/Vulkan-Hpp/vulkan/vulkan_hash.hpp ...
  VulkanHppGenerator: Generating D:/a/Vulkan-Hpp/Vulkan-Hpp/vulkan/vulkan_hpp_macros.hpp ...
  VulkanHppGenerator: Formatting D:/a/Vulkan-Hpp/Vulkan-Hpp/vulkan/vulkan_hpp_macros.hpp ...
  VulkanHppGenerator: Generating D:/a/Vulkan-Hpp/Vulkan-Hpp/vulkan/vulkan_shared.hpp ...
  VulkanHppGenerator: Generating D:/a/Vulkan-Hpp/Vulkan-Hpp/vulkan/vulkan_static_assertions.hpp ...
  VulkanHppGenerator: Formatting D:/a/Vulkan-Hpp/Vulkan-Hpp/vulkan/vulkan_shared.hpp ...
  VulkanHppGenerator: Generating D:/a/Vulkan-Hpp/Vulkan-Hpp/vulkan/vulkan_structs.hpp ...
  VulkanHppGenerator: Generating D:/a/Vulkan-Hpp/Vulkan-Hpp/vulkan/vulkan_to_string.hpp ...
  VulkanHppGenerator: Formatting D:/a/Vulkan-Hpp/Vulkan-Hpp/vulkan/vulkan_format_traits.hpp ...
  VulkanHppGenerator: Formatting D:/a/Vulkan-Hpp/Vulkan-Hpp/vulkan/vulkan.hpp ...
  VulkanHppGenerator: Formatting D:/a/Vulkan-Hpp/Vulkan-Hpp/vulkan/vulkan.cppm ...
  VulkanHppGenerator: Formatting D:/a/Vulkan-Hpp/Vulkan-Hpp/vulkan/vulkan_enums.hpp ...
  VulkanHppGenerator: Formatting D:/a/Vulkan-Hpp/Vulkan-Hpp/vulkan/vulkan_hash.hpp ...
  VulkanHppGenerator: Formatting D:/a/Vulkan-Hpp/Vulkan-Hpp/vulkan/vulkan_static_assertions.hpp ...
  VulkanHppGenerator: Formatting D:/a/Vulkan-Hpp/Vulkan-Hpp/vulkan/vulkan_to_string.hpp ...
  VulkanHppGenerator: Formatting D:/a/Vulkan-Hpp/Vulkan-Hpp/vulkan/vulkan_handles.hpp ...
  VulkanHppGenerator: Formatting D:/a/Vulkan-Hpp/Vulkan-Hpp/vulkan/vulkan_funcs.hpp ...
  VulkanHppGenerator: Formatting D:/a/Vulkan-Hpp/Vulkan-Hpp/vulkan/vulkan_structs.hpp ...
  VulkanHppGenerator: Generating D:/a/Vulkan-Hpp/Vulkan-Hpp/vulkan/vulkan_raii.hpp ...
  VulkanHppGenerator: Formatting D:/a/Vulkan-Hpp/Vulkan-Hpp/vulkan/vulkan_raii.hpp ...
  Building Custom Rule D:/a/Vulkan-Hpp/Vulkan-Hpp/CMakeLists.txt
C:\Program Files\Microsoft Visual Studio\2022\Enterprise\MSBuild\Microsoft\VC\v170\Microsoft.CppCommon.targets(254,5): error MSB8066: Custom build for 'D:\a\Vulkan-Hpp\Vulkan-Hpp\build\11\Debug\CMakeFiles\b72a330e21ee03dd2afda6fc8f956936\vulkan.hpp.rule;D:\a\Vulkan-Hpp\Vulkan-Hpp\build\11\Debug\CMakeFiles\50308fb54619814b0b89830c2dc6d[167](https://github.com/KhronosGroup/Vulkan-Hpp/actions/runs/13414491313/job/37471943457#step:4:168)\build_vulkan_hpp.rule;D:\a\Vulkan-Hpp\Vulkan-Hpp\CMakeLists.txt' exited with code -1. [D:\a\Vulkan-Hpp\Vulkan-Hpp\build\11\Debug\build_vulkan_hpp.vcxproj]
Error: Process completed with exit code 1.

I've encountered this sort of error in other projects on windows when trying to write to still opened files. The only place in the generator code where this error can occur is in the writeToFile function, specifically after closing the ofstream and trying to write to the newly created file via clangd-format:

Vulkan-Hpp/XMLHelper.hpp

Lines 560 to 576 in 8ab6cb5

	void writeToFile( std::string const & str, std::string const & fileName )
	{
	std::ofstream ofs( fileName );
	assert( !ofs.fail() );
	ofs << str;
	ofs.close();
	#if defined( CLANG_FORMAT_EXECUTABLE )
	messager.message( "VulkanHppGenerator: Formatting " + fileName + " ...\n" );
	const std::string commandString = "\"" CLANG_FORMAT_EXECUTABLE "\" -i --style=file " + fileName;
	const int ret = std::system( commandString.c_str() );
	if ( ret != 0 )
	{
	throw std::runtime_error( "VulkanHppGenerator: failed to format file " + fileName + " with error <" + std::to_string( ret ) + ">" );
	}
	#endif
	}

Normally, I would expect ofs.close() to flush the stream, but as it never explicitly calls flush() internally, I've added it manually. Let's see if it actually helps..

[asuessenbach]

Apparently, adding a flush does not help.

What do you think about scoping ofs, like

  {
    std::ofstream ofs( fileName );
    assert( !ofs.fail() );
    ofs << str;
  }

[M2-TE]

That seems to have worked at least!
Do you want to rerun the checks a few times before merging?

[asuessenbach]

Do you want to rerun the checks a few times before merging?

I think, rerunning at least once is worth a try. That probably needs some push from your side.

[asuessenbach]

Well, I think (hope?), it's fine now.

Thanks a lot again for your contribution!