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• CMake pull request: compdb: mergedCompileCommands for CMake subprojects
• cpptools issue: Support multiple compile commands files per project

Implementation Suggestion:

• define the following entries in .vscode/settings.json:

    "C_Cpp.default.compileCommands": "${workspaceFolder}/build/merged_compile_commands.json", // already implemented
    "C_cpp.mergeCompileCommands": { // new
        "source": [
            "${workspaceFolder}/build/proj1/compile_commands.json",
            "${workspaceFolder}/build/proj2/compile_commands.json",
        ],
        "destination": "${workspaceFolder}/build/merged_compile_commands.json"
    },

• "C_Cpp.default.compileCommands" can also be ignored and overridden to C_cpp.mergeCompileCommands.destination (not mandatory)

Why not use paths already defined in .vscode/c_cpp_properties.json configuratations?

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Why glob patterns are not supported?

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