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# MJIT
Here are some tips that might be useful when you work on MJIT:
## Always run make install
Always run `make install` before running MJIT. It could easily cause a SEGV if you don't.
MJIT looks for the installed header for security reasons.
## --mjit-debug vs --mjit-debug=-ggdb3
`--mjit-debug=[flags]` allows you to specify arbitrary flags while keeping other compiler flags like `-O3`,
which is useful for profiling benchmarks.
`--mjit-debug` alone, on the other hand, disables `-O3` and adds debug flags.
If you're debugging MJIT, what you need to use is not `--mjit-debug=-ggdb3` but `--mjit-debug`.
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