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Some newlib-related optimizations #263

Merged
merged 3 commits into from
Jan 23, 2021
Merged

Some newlib-related optimizations #263

merged 3 commits into from
Jan 23, 2021

Commits on Dec 5, 2020

  1. Don't call init_signal in crt0.S 

    This avoids two issues:
- init_signal unconditionally pulls in and calls malloc,
  even if signals aren't used
- The allocated memory is (intentionally) never freed

It appears like functions depending on init_signal call it themselves if it
wasn't done previously, so this avoids both issues, as long as signal functions
aren't used in the program.
    @Vogtinator
    Vogtinator committed Dec 5, 2020
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  2. Explicitly free newlib's global data on exit 

    - Without this, memory allocated by e.g. dtoa would not get freed
- Have to set _impure_ptr to NULL to avoid if(ptr == _inpure_ptr) return;
  in _reclaim_reent
    @Vogtinator
    Vogtinator committed Dec 5, 2020
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  3. Call __gnu_cxx::__freeres() in _exit 

    Like for newlib, libstdc++ also needs some code for cleaning up.
    @Vogtinator
    Vogtinator committed Dec 5, 2020
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