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Initial emscripten work #30453

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wants to merge 3 commits into from
Closed

Initial emscripten work #30453

wants to merge 3 commits into from

Commits on Dec 22, 2015

  1. Add the asmjs-unknown-emscripten triple. Add cfgs to libs. 

    Backtraces, and the compilation of libbacktrace for asmjs, are disabled.

This port doesn't use jemalloc so, like pnacl, it disables jemalloc *for all targets*
in the configure file.

It updates libc to not link to -m and -rt since all emscripten runtime components
are part of libc. Emscripten libc is musl.

It disables stack protection.
    @brson
    brson committed Dec 22, 2015
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  2. rustc: Add obj_is_bitcode to TargetOptions 

    This tells trans::back::write not to LLVM codegen to create .o
files but to put LLMV bitcode in .o files.

Emscripten's emcc supports .o in this format, and this is,
I think, slightly easier than making rlibs work without .o
files.
    @brson
    brson committed Dec 22, 2015
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  3. std: Always use alloc_system in stage0 so snaps work with --disable-j… 

    …emalloc
    @brson
    brson committed Dec 22, 2015
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