CMakePresets on Windows - Error while generating - "We couldn't mkdir `.\./output_dir/`"

[JanFeld]

Bug description
I'm using CMakePresets which mostly works fine.
But if i'm working in a project where the output directory is not yet created i get an error depending on the contents of the CMakePresets.

The project i'm working on has a binaryDir specified in the CMakePresets.json like the following:

"binaryDir": "${sourceDir}/output/${presetName}"

Which uses / as path separators.

When trying to run CMakeGenerate it seems like the ${sourceDir} component is expanded to C:\Path\To\Cwd\./output/debug.

This fails with the following error:

Error executing Lua callback: ...site\pack\packer\start\plenary.nvim/lua/plenary/path.lua:505: We couldn't mkdir: C:\Path\To\Cwd\./output/debug                                                                                                                                                                                                                                                                

It seems that the error itself is not caused by cmake or cmake-tools but by the resolved path passed to plenary.

When running cmake --preset debug directly the correct directory is created and the cmake generation is running successfully.

Possible solutions i could think of would be a platform dependend path resolution (Windows Paths <-> Posix Paths) or directly calling cmake so that the mkdir is handled by cmake.

Additional-Info:
If i'm replacing the / with \\ in the CMakePresets.json it is working as expected, but is not portable to linux i guess.
If the directory is already created this issue disappears and CMakeGenerate works as expected.

Steps to reproduce

Minimal configuration

CMakePresets.json:

{
	"version": 3,
	"cmakeMinimumRequired": {
		"major": 3,
		"minor": 26,
		"patch": 0
	},
	"configurePresets": [
		{
			"name": "debug",
			"displayName": "Debug",
			"generator": "Ninja",
			"binaryDir": "${sourceDir}/output/${presetName}",
            		"cacheVariables": {
                		"CMAKE_EXPORT_COMPILE_COMMANDS": "ON"
            		}
		},
		{
			"name": "release",
			"displayName": "Release",
			"inherits": "debug",
			"cacheVariables": {
				"CMAKE_BUILD_TYPE": "Release"
			}
		}
	],
	"buildPresets": [
		{
			"name": "debug",
			"displayName": "Debug",
			"configurePreset": "debug",
			"environment": {
				"VERBOSE": "1"
			}
		},
		{
			"name": "release",
			"displayName": "Release",
			"configurePreset": "release",
			"environment": {
				"VERBOSE": "1"
			}
		}
	]
}

And a simple CMake-Project.
I guess i don't have to provide this to you.

1. :CMakeGenerate
2. -> error

Error executing Lua callback: ...site\pack\packer\start\plenary.nvim/lua/plenary/path.lua:505: We couldn't mkdir: C:\Path\To\Cwd\./output/debug                                                                                                                                                                                                                                                                

Expected behavior
Well, i'd expect a correctly configured binary-dir which is ready to perform the build step.

Environment

• OS: Windows 10
• CMake 3.30.5
• Neovim v0.11.2
• cmake-tools 1724421

[AtifChy]

@JanFeld does #338 fix your issue?

[JanFeld]

@AtifChy Yes, it seems like it does fix it.
When printing the Path it has replaced any / with \.

Thanks!