Commits on Feb 10, 2017

1. Add Emscripten-specific linker …

   It claims to accept most GNU linker options, but in fact most of them
   have no effect and instead it requires some special options which are
   easier to handle in a separate trait.
   
   Currently added:
    - `export_symbols`: works on executables as special Emscripten case
   since staticlibs/dylibs aren't compiled to JS, while exports are
   required to be accessible from JS.
   Fixes rust-lang#39171.
    - `optimize` - translates Rust's optimization level to Emscripten
   optimization level (whether passed via `-C opt-level=...` or `-O...`).
   Fixes rust-lang#36899.
    - `debuginfo` - translates debug info; Emscripten has 5 debug levels
   while Rust has 3, so chose to translate `-C debuginfo=1` to `-g3`
   (preserves whitespace, variable and function names for easy debugging).
   Fixes rust-lang#36901.
    - `no_default_libraries` - tells Emscripten to exlude `memcpy` and co.

   

   RReverser committed Feb 10, 2017
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2. Reenable exception catching in Emscripten even on optimized targets

   

   RReverser committed Feb 10, 2017
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3. Disable memory init file until further notice …

   It's support is currently too buggy in both Rust tests and Cargo.

   

   RReverser committed Feb 10, 2017
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