bors c13a929d58 auto merge of #12020 : alexcrichton/rust/output-flags, r=brson
This commit removes the -c, --emit-llvm, -s, --rlib, --dylib, --staticlib,
--lib, and --bin flags from rustc, adding the following flags:

* --emit=[asm,ir,bc,obj,link]
* --crate-type=[dylib,rlib,staticlib,bin,lib]

The -o option has also been redefined to be used for *all* flavors of outputs.
This means that we no longer ignore it for libraries. The --out-dir remains the
same as before.

The new logic for files that rustc emits is as follows:

1. Output types are dictated by the --emit flag. The default value is
   --emit=link, and this option can be passed multiple times and have all options
   stacked on one another.
2. Crate types are dictated by the --crate-type flag and the #[crate_type]
   attribute. The flags can be passed many times and stack with the crate
   attribute.
3. If the -o flag is specified, and only one output type is specified, the
   output will be emitted at this location. If more than one output type is
   specified, then the filename of -o is ignored, and all output goes in the
   directory that -o specifies. The -o option always ignores the --out-dir
   option.
4. If the --out-dir flag is specified, all output goes in this directory.
5. If -o and --out-dir are both not present, all output goes in the directory of
   the crate file.
6. When multiple output types are specified, the filestem of all output is the
   same as the name of the CrateId (derived from a crate attribute or from the
   filestem of the crate file).

Closes #7791
Closes #11056
Closes #11667
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This is a preliminary version of the Rust compiler, libraries and tools.

Source layout:

Path Description
librustc/ The self-hosted compiler
libstd/ The standard library (imported and linked by default)
libextra/ The "extras" library (slightly more peripheral code)
libgreen/ The M:N runtime library
libnative/ The 1:1 runtime library
libsyntax/ The Rust parser and pretty-printer
------------------- ---------------------------------------------------------
rt/ The runtime system
rt/rust_*.c - Some of the runtime services
rt/vg - Valgrind headers
rt/msvc - MSVC support
rt/sundown - The Markdown library used by rustdoc
------------------- ---------------------------------------------------------
compiletest/ The test runner
test/ Testsuite
test/codegen - Tests for the LLVM IR infrastructure
test/compile-fail - Tests that should fail to compile
test/debug-info - Tests for the debuginfo tool
test/run-fail - Tests that should compile, run and fail
test/run-make - Tests that depend on a Makefile infrastructure
test/run-pass - Tests that should compile, run and succeed
test/bench - Benchmarks and miscellaneous
test/pretty - Pretty-printer tests
test/auxiliary - Dependencies of tests
------------------- ---------------------------------------------------------
librustdoc/ The Rust API documentation tool
libuv/ The libuv submodule
------------------- ---------------------------------------------------------
llvm/ The LLVM submodule
rustllvm/ LLVM support code
------------------- ---------------------------------------------------------
etc/ Scripts, editors support, misc