Commits on Nov 5, 2017

1. rustc: Handle some libstd symbole exports better …

   Right now symbol exports, particularly in a cdylib, are handled by
   assuming that `pub extern` combined with `#[no_mangle]` means "export
   this". This isn't actually what we want for some symbols that the
   standard library uses to implement itself, for example symbols related
   to allocation. Additionally other special symbols like
   `rust_eh_personallity` have no need to be exported from cdylib crate
   types (only needed in dylib crate types).
   
   This commit updates how rustc handles these special symbols by adding to
   the hardcoded logic of symbols like `rust_eh_personallity` but also
   adding a new attribute, `#[rustc_std_internal_symbol]`, which forces the
   export level to be considered the same as all other Rust functions
   instead of looking like a C function.
   
   The eventual goal here is to prevent functions like `__rdl_alloc` from
   showing up as part of a Rust cdylib as it's just an internal
   implementation detail. This then further allows such symbols to get gc'd
   by the linker when creating a cdylib.

   

   alexcrichton committed Nov 5, 2017
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