v1.2.0 error when building rustc for ios targets

[nathansizemore]

Cannot seem to get the same targets to compile on v1.2.0, with the same commands used for v1.1.0

git clone git@github.com:rust-lang/rust.git
cd rust
git checkout 1.2.0
./configure --target=armv7-apple-ios,armv7s-apple-ios,i386-apple-ios,aarch64-apple-ios,x86_64-apple-ios --prefix=$HOME/rustc-ios
make -j8

rustc: x86_64-apple-darwin/stage2/lib/rustlib/armv7-apple-ios/lib/libstd
rustc: x86_64-apple-darwin/stage2/lib/rustlib/armv7s-apple-ios/lib/libstd
warning: dropping unsupported crate type `dylib` for target `armv7-apple-ios`
warning: dropping unsupported crate type `dylib` for target `armv7s-apple-ios`
rustc: x86_64-apple-darwin/stage2/lib/rustlib/aarch64-apple-ios/lib/libstd
rustc: x86_64-apple-darwin/stage2/lib/rustlib/x86_64-apple-ios/lib/libstd
warning: dropping unsupported crate type `dylib` for target `aarch64-apple-ios`
warning: dropping unsupported crate type `dylib` for target `x86_64-apple-ios`
rustc: x86_64-apple-darwin/stage2/lib/rustlib/x86_64-apple-darwin/lib/libstd
rustc: x86_64-apple-darwin/stage2/lib/rustlib/i386-apple-ios/lib/libstd
warning: dropping unsupported crate type `dylib` for target `i386-apple-ios`
src/libstd/sys/unix/backtrace.rs:133:5: 133:17 error: use of unstable library feature 'result_fold': has not seen enough usage to justify its position in the standard library
src/libstd/sys/unix/backtrace.rs:133     result::fold(iter, (), |_, _| ())
                                         ^~~~~~~~~~~~
src/libstd/sys/unix/backtrace.rs:133:5: 133:17 help: add #![feature(result_fold)] to the crate attributes to enable
src/libstd/sys/unix/backtrace.rs:133:5: 133:17 error: use of deprecated item: has not seen enough usage to justify its position in the standard library, #[deny(deprecated)] on by default
src/libstd/sys/unix/backtrace.rs:133     result::fold(iter, (), |_, _| ())
                                         ^~~~~~~~~~~~
error: aborting due to 2 previous errors
make: *** [x86_64-apple-darwin/stage2/lib/rustlib/armv7-apple-ios/lib/stamp.std] Error 101
make: *** Waiting for unfinished jobs....
src/libstd/sys/unix/backtrace.rs:133:5: 133:17 error: use of unstable library feature 'result_fold': has not seen enough usage to justify its position in the standard library
src/libstd/sys/unix/backtrace.rs:133     result::fold(iter, (), |_, _| ())
                                         ^~~~~~~~~~~~
src/libstd/sys/unix/backtrace.rs:133:5: 133:17 help: add #![feature(result_fold)] to the crate attributes to enable
src/libstd/sys/unix/backtrace.rs:133:5: 133:17 error: use of deprecated item: has not seen enough usage to justify its position in the standard library, #[deny(deprecated)] on by default
src/libstd/sys/unix/backtrace.rs:133     result::fold(iter, (), |_, _| ())
                                         ^~~~~~~~~~~~
error: aborting due to 2 previous errors
make: *** [x86_64-apple-darwin/stage2/lib/rustlib/armv7s-apple-ios/lib/stamp.std] Error 101

[tamird]

Was fixed in #27267. Perhaps needs a backport?

[chriskrycho]

Ran into this same thing something that I thought was the same on master earlier today after doing a fresh clone last night. I pulled the latest from master (including all submodules) just now, and am trying a rebuild. I'll update this comment with the results in the morning.

---

Results

Slightly different error, in a slightly different place, though: mine is giving up after running into unused imports from prelude::v1::* and libc::c_void on the x86_64-apple-darwin build.

Perhaps incidentally, and perhaps not, I am running OS X 10.11 public beta 3 (roughly corresponds to developer beta 5).

Output was:

(snip)
rustc: x86_64-apple-darwin/stage2/lib/rustlib/x86_64-apple-darwin/lib/libstd
rustc: x86_64-apple-darwin/stage2/lib/rustlib/i386-apple-ios/lib/libstd
rustc: x86_64-apple-darwin/stage2/lib/rustlib/armv7s-apple-ios/lib/libstd
rustc: x86_64-apple-darwin/stage2/lib/rustlib/armv7-apple-ios/lib/libstd
warning: dropping unsupported crate type `dylib` for target `i386-apple-ios`
rustc: x86_64-apple-darwin/stage2/lib/rustlib/aarch64-apple-ios/lib/libstd
warning: dropping unsupported crate type `dylib` for target `armv7s-apple-ios`
warning: dropping unsupported crate type `dylib` for target `armv7-apple-ios`
warning: dropping unsupported crate type `dylib` for target `aarch64-apple-ios`
rustc: x86_64-apple-darwin/stage2/lib/rustlib/x86_64-apple-ios/lib/libstd
warning: dropping unsupported crate type `dylib` for target `x86_64-apple-ios`
../src/libstd/rand/os.rs:185:9: 185:24 error: unused import, #[deny(unused_imports)] on by default
../src/libstd/rand/os.rs:185     use prelude::v1::*;
                                     ^~~~~~~~~~~~~~~
../src/libstd/rand/os.rs:190:23: 190:29 error: unused import, #[deny(unused_imports)] on by default
../src/libstd/rand/os.rs:190     use libc::{c_int, c_void, size_t};
                                                   ^~~~~~
error: aborting due to 2 previous errors
make: *** [x86_64-apple-darwin/stage2/lib/rustlib/i386-apple-ios/lib/stamp.std] Error 101
make: *** Waiting for unfinished jobs....
../src/libstd/rand/os.rs:185:9: 185:24 error: unused import, #[deny(unused_imports)] on by default
../src/libstd/rand/os.rs:185     use prelude::v1::*;
                                     ^~~~~~~~~~~~~~~
../src/libstd/rand/os.rs:190:23: 190:29 error: unused import, #[deny(unused_imports)] on by default
../src/libstd/rand/os.rs:190     use libc::{c_int, c_void, size_t};
                                                   ^~~~~~
error: aborting due to 2 previous errors
make: *** [x86_64-apple-darwin/stage2/lib/rustlib/armv7s-apple-ios/lib/stamp.std] Error 101
../src/libstd/rand/os.rs:185:9: 185:24 error: unused import, #[deny(unused_imports)] on by default
../src/libstd/rand/os.rs:185     use prelude::v1::*;
                                     ^~~~~~~~~~~~~~~
../src/libstd/rand/os.rs:190:23: 190:29 error: unused import, #[deny(unused_imports)] on by default
../src/libstd/rand/os.rs:190     use libc::{c_int, c_void, size_t};
                                                   ^~~~~~
error: aborting due to 2 previous errors
make: *** [x86_64-apple-darwin/stage2/lib/rustlib/armv7-apple-ios/lib/stamp.std] Error 101
../src/libstd/rand/os.rs:185:9: 185:24 error: unused import, #[deny(unused_imports)] on by default
../src/libstd/rand/os.rs:185     use prelude::v1::*;
                                     ^~~~~~~~~~~~~~~
../src/libstd/rand/os.rs:190:23: 190:29 error: unused import, #[deny(unused_imports)] on by default
../src/libstd/rand/os.rs:190     use libc::{c_int, c_void, size_t};
                                                   ^~~~~~
error: aborting due to 2 previous errors
make: *** [x86_64-apple-darwin/stage2/lib/rustlib/aarch64-apple-ios/lib/stamp.std] Error 101
../src/libstd/rand/os.rs:185:9: 185:24 error: unused import, #[deny(unused_imports)] on by default
../src/libstd/rand/os.rs:185     use prelude::v1::*;
                                     ^~~~~~~~~~~~~~~
../src/libstd/rand/os.rs:190:23: 190:29 error: unused import, #[deny(unused_imports)] on by default
../src/libstd/rand/os.rs:190     use libc::{c_int, c_void, size_t};
                                                   ^~~~~~
error: aborting due to 2 previous errors
make: *** [x86_64-apple-darwin/stage2/lib/rustlib/x86_64-apple-ios/lib/stamp.std] Error 101```

[nagisa]

Perhaps needs a backport?

1.2 is already released as stable.

[steveklabnik]

since #27674 was merged, i'm closing

[zaeleus]

@steveklabnik, #27674 only fixes building ios targets on master. The original issue is about building 1.2.0 stable, which requires #27088 to be backported.

[steveklabnik]

We don't do backports to stable for anything but security fixes, so unfortunately that won't happen.