Weed out dependencies on librustc_llvm and librustc.

[eddyb]

Found while working on #32570. cc @nikomatsakis

[eddyb]

@oli-obk Was there a specific reason rustc_const_eval ended up in TARGET_CRATES? Don't want to break anything with this change.

[oli-obk]

I was sure it was needed at some point, but I don't remember why.
Probably I misunderstood something about how staging and
plugin-unit-tests work.

I don't see why it should be there.

Am 29.03.2016 um 12:56 schrieb Eduard-Mihai Burtescu:

@oli-obk https://github.com/oli-obk Was there a specific reason
|rustc_const_eval| ended up in |TARGET_CRATES|? Don't want to break
anything with this change.

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#32571 (comment)

[arielb1]

This breaks the execution-engine test:

test.rs:31:5: 31:16 error: unresolved import `rustc::llvm`. There is no `llvm` in `rustc` [E0432]
test.rs:31 use rustc::llvm;
               ^~~~~~~~~~~
test.rs:31:5: 31:16 help: run `rustc --explain E0432` to see a detailed explanation
test.rs:105:12: 105:24 error: the type of this value must be known in this context
test.rs:105         if ee.is_null() {
                       ^~~~~~~~~~~~
test.rs:100:21: 100:25 error: the trait `core::marker::Sized` is not implemented for the type `[std::path::PathBuf]` [E0277]
test.rs:100         let (llmod, deps) = compile_program(program, sysroot.clone())
                                ^~~~
test.rs:100:21: 100:25 help: run `rustc --explain E0277` to see a detailed explanation
test.rs:100:21: 100:25 note: `[std::path::PathBuf]` does not have a constant size known at compile-time
test.rs:100:21: 100:25 note: all local variables must have a statically known size
test.rs:120:21: 120:25 error: the trait `core::marker::Sized` is not implemented for the type `[std::path::PathBuf]` [E0277]
test.rs:120         let (llmod, deps) = compile_program(program, self.sysroot.clone())
                                ^~~~
test.rs:120:21: 120:25 help: run `rustc --explain E0277` to see a detailed explanation
test.rs:120:21: 120:25 note: `[std::path::PathBuf]` does not have a constant size known at compile-time
test.rs:120:21: 120:25 note: all local variables must have a statically known size
test.rs:136:17: 136:29 error: the type of this value must be known in this context
test.rs:136             if !fv.is_null() {
                            ^~~~~~~~~~~~
test.rs:139:26: 139:38 error: the type of this value must be known in this context
test.rs:139                 assert!(!fp.is_null());
                                     ^~~~~~~~~~~~
test.rs:139:17: 139:40 note: in this expansion of assert! (defined in <std macros>)
test.rs:153:17: 153:29 error: the type of this value must be known in this context
test.rs:153             if !gv.is_null() {
                            ^~~~~~~~~~~~
test.rs:156:26: 156:38 error: the type of this value must be known in this context
test.rs:156                 assert!(!gp.is_null());
                                     ^~~~~~~~~~~~
test.rs:156:17: 156:40 note: in this expansion of assert! (defined in <std macros>)
error: aborting due to 7 previous errors

Try to add a extern crate rustc_llvm

[alexcrichton]

r=me once this is passing, thanks @eddyb!

[nagisa]

Could be moved all the way to phase 3 I think?

[eddyb]

Just in case something is touching LLVM before then, I didn't want to change behavior.

[eddyb]

@arielb1 Heh, I put this up to get some thoughts and didn't get to make sure everything compiles, thanks!

[eddyb]

@bors r=alexcrichton

[bors]

📌 Commit f22ec29 has been approved by alexcrichton

[bors]

⌛ Testing commit f22ec29 with merge ec666a5...

[bors]

☀️ Test successful - auto-linux-32-nopt-t, auto-linux-32-opt, auto-linux-64-debug-opt, auto-linux-64-nopt-t, auto-linux-64-opt, auto-linux-64-opt-mir, auto-linux-64-opt-rustbuild, auto-linux-64-x-android-t, auto-linux-64-x-armhf, auto-linux-64-x-armsf, auto-linux-64-x-freebsd, auto-linux-64-x-netbsd, auto-linux-cross-opt, auto-linux-musl-64-opt, auto-mac-32-opt, auto-mac-64-nopt-t, auto-mac-64-opt, auto-mac-ios-opt, auto-win-gnu-32-nopt-t, auto-win-gnu-32-opt, auto-win-gnu-32-opt-rustbuild, auto-win-gnu-64-nopt-t, auto-win-gnu-64-opt, auto-win-msvc-32-opt, auto-win-msvc-64-opt, auto-win-msvc-64-opt-mir, auto-win-msvc-64-opt-rustbuild