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db14d81098
This is a debug setting. We should only make debug builds if user requests a debug build. Currently this is inserted in release builds. Furthermore, it would be better to insert these settings in --pre-link-args because then it would be possible to override them if appropriate. Because these are inserted at the end, it is necessary to patch emscripten to remove them.
rustc_target contains some very low-level details that are
specific to different compilation targets and so forth.
For more information about how rustc works, see the rustc dev guide.