To perform the test using CT 2023.12, the toolchain setting is required.
To create a project, you must have a toolchain(compiler information) of the sources to test.

The toolchain can be set in [Window] -> [Preferences] -> [Toolchain].

And it can also be set through [Toolchain setting] in Create a source file C/C++ project wizard or in Create a C/C++ Project from Embedded wizard.

The functions related to the toolchain setting provided by CT 2023.12 are as follows.

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