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I'm trying to run cmake with ctrl+shift+B like so:

{ "version": "2.0.0", "tasks": [ { "label": "cmake", "type": "shell", "options": { "cwd": "${workspaceRoot}/build" }, "command": "cmake ${workspaceRoot} -G \"MinGW Makefiles\"", (...) }, { "label": "make", "type": "shell", "command": "mingw32-make.exe", "options": { "cwd": "${workspaceRoot}/build" }, (...), "dependsOn":["cmake"] }, { "label": "build", "type": "shell", "options": { "cwd": "${workspaceRoot}/build" }, "group": { "kind": "build", "isDefault": true }, "dependsOn": ["make"] } ] }

But no matter what I do It runs on ${workspaceRoot} instead of the ${workspaceRoot}/build one:

Executing task in folder cpppractice: cmake C:\workspace\cpp\cpppractice -G "MinGW Makefiles"

Is there anyhting wrong with this approach? As far as I understand the cwd variable in the options item should work.

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  • why do this when the CMake Tools extension exists? Commented Oct 25, 2023 at 8:51

3 Answers 3

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{ "label": "cmake", "type": "shell", "options": { "cwd": "${workspaceFolder}/build" }, "command": "cmake \"MinGW Makefiles\" ${workspaceFolder}", },

This works, It seems that the "Executing task in folder cpppractice:" is not accurate and it is executing it in the correct place, as for why it did not work previously I think it's parsing the args incorrectly? I can't confirm, but here is the output:

Executing task in folder cpppractice: cmake "MinGW Makefiles" C:\workspace\cpp\cpppractice < -- Configuring done -- Generating done -- Build files have been written to: C:/workspace/cpp/cpppractice/build

Where previously it was compalining about not being able Use the generator "MinGW" which means that it separating the argument "MinGW Makefiles". After some tinkering I found out that this is also an answer:

{ "label": "cmake", "type": "shell", "options": { "cwd": "${workspaceFolder}/build" }, "command": "cmake", "args": [ "-G", "'MinGW Makefiles'", "./.." ], ... },

I actually find the second approach a little bit cleaner but both work the same, So in order to pass an argument as a string you have to use single quotes like so:

... "command":"echo", "args": [ "'Za Warudo!'", ], ...
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3

You pass arguments to cmake wrongly. The whole string cmake ${workspaceRoot} -G "MinGW Makefiles" is treated as a command name. Arguments must be listed in the args array.

{ "version": "2.0.0", "tasks": [ { "label": "cmake", "type": "shell", "options": { "cwd": "${workspaceRoot}/build" }, "command": "cmake", "args": [ "${workspaceRoot}", "-G", "\"MinGW Makefiles\"" ] }, ... ] }
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I had already tried this, but the output is the same: Executing task in folder cpppractice: cmake C:\workspace\cpp\cpppractice -G "MinGW Makefiles"
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cmake now has a -B option that you can use to specify a build directory. No need to change directory before calling it. It will even create the build dir for you.

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