Compilation speed concerns

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Objeck has expanded greatly compared to when I knew it. The compilation speed is also worsening. This is normal for any large C++ project. The problem is that the build system of Objeck is not fully paralleled. If you pay a bit more attention to what is printed on the screen, you will see that make tells you:

make[1]: warning: jobserver unavailable: using -j1.  Add '+' to parent make rule.

The way you designed your makefiles makes it impossible to fully utilize the parallelization feature of make, and a lot of code has to be built again and again. I think it's time to change it. Either redesign your makefiles or switch to cmake or meson. This will also help reduce the compilation time on Github Actions.

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The warning make[1]: warning: jobserver unavailable: using -j1. Add '+' to parent make rule. is gone now.