Commits on Jul 30, 2016

1. Update gcc crate dependency to 0.3.27. …

   This is to pull in changes to support ARM MUSL targets.
   
   This change also commits a couple of other cargo-generated changes
   to other dependencies in the various Cargo.toml files.

   

   timonvo authored and Jorge Aparicio committed Jul 30, 2016
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2. Add ARM MUSL targets. …

   The targets are:
   - `arm-unknown-linux-musleabi`
   - `arm-unknown-linux-musleabihf`
   - `armv7-unknown-linux-musleabihf`
   
   These mirror the existing `gnueabi` targets.
   
   All of these targets produce fully static binaries, similar to the
   x86 MUSL targets.
   
   For now these targets can only be used with `--rustbuild` builds, as
   rust-lang/compiler-rt#22 only made the
   necessary compiler-rt changes in the CMake configs, not the plain
   GNU Make configs.
   
   I've tested these targets GCC 5.3.0 compiled again musl-1.1.12
   (downloaded from http://musl.codu.org/). An example `./configure`
   invocation is:
   
   ```
   ./configure \
       --enable-rustbuild
       --target=arm-unknown-linux-musleabi \
       --musl-root="$MUSL_ROOT"
   ```
   
   where `MUSL_ROOT` points to the `arm-linux-musleabi` prefix.
   Usually that path will be of the form
   `/foobar/arm-linux-musleabi/arm-linux-musleabi`.
   
   Usually the cross-compile toolchain will live under
   `/foobar/arm-linux-musleabi/bin`. That path should either by added
   to your `PATH` variable, or you should add a section to your
   `config.toml` as follows:
   
   ```
   [target.arm-unknown-linux-musleabi]
   cc = "/foobar/arm-linux-musleabi/bin/arm-linux-musleabi-gcc"
   cxx = "/foobar/arm-linux-musleabi/bin/arm-linux-musleabi-g++"
   ```
   
   As a prerequisite you'll also have to put a cross-compiled static
   `libunwind.a` library in `$MUSL_ROOT/lib`. This is similar to [how
   the x86_64 MUSL targets are built]
   (https://doc.rust-lang.org/book/advanced-linking.html).

   

   timonvo authored and Jorge Aparicio committed Jul 30, 2016
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3. arm-musl targets now use cfg(env = "musl")

   Jorge Aparicio committed Jul 30, 2016
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4. arm-musl: set max_atomic_width

   Jorge Aparicio committed Jul 30, 2016
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5. arm-musl: statically link to libunwind

   Jorge Aparicio committed Jul 30, 2016
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6. rustc_back/target: remove musl_base …

   it's the same as linux_musl_base

   Jorge Aparicio committed Jul 30, 2016
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7. remove some anys that are no longer necessary

   Jorge Aparicio committed Jul 30, 2016
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8. point the libc submodule back to rust-lang/libc

   Jorge Aparicio committed Jul 30, 2016
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9. return TargetResult

   Jorge Aparicio committed Jul 30, 2016
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