Linking to iOS fails

[kud1ing]

ld: warning: ignoring file arm-apple-darwin/rt/stage2/sync/lock_and_signal.o, file was built for arm??? which is not the architecture being linked (x86_64): arm-apple-darwin/rt/stage2/sync/lock_and_signal.o
ld: warning: ignoring file arm-apple-darwin/rt/stage2/rust_builtin.o, file was built for arm??? which is not the architecture being linked (x86_64): arm-apple-darwin/rt/stage2/rust_builtin.o
ld: warning: ignoring file arm-apple-darwin/rt/stage2/rust_upcall.o, file was built for arm??? which is not the architecture being linked (x86_64): arm-apple-darwin/rt/stage2/rust_upcall.o
ld: warning: ignoring file arm-apple-darwin/rt/stage2/miniz.o, file was built for arm??? which is not the architecture being linked (x86_64): arm-apple-darwin/rt/stage2/miniz.o
ld: warning: ignoring file arm-apple-darwin/rt/stage2/rust_android_dummy.o, file was built for arm??? which is not the architecture being linked (x86_64): arm-apple-darwin/rt/stage2/rust_android_dummy.o
ld: warning: ignoring file arm-apple-darwin/rt/stage2/rust_test_helpers.o, file was built for arm??? which is not the architecture being linked (x86_64): arm-apple-darwin/rt/stage2/rust_test_helpers.o
ld: warning: ignoring file arm-apple-darwin/rt/stage2/arch/arm/_context.o, file was built for arm??? which is not the architecture being linked (x86_64): arm-apple-darwin/rt/stage2/arch/arm/_context.o
ld: warning: ignoring file arm-apple-darwin/rt/stage2/arch/arm/record_sp.o, file was built for arm??? which is not the architecture being linked (x86_64): arm-apple-darwin/rt/stage2/arch/arm/record_sp.o
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ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [arm-apple-darwin/rt/stage2/librustrt.dylib] Error 1

[alexcrichton]

It appears that we have compiled a bunch of arm binaries but you're expecting to link a 64-bit x86 binary. I imagine that in mk/platform.mk under CFG_GCCISH_LINK_FLAGS_arm-apple-darwin there should be some flag saying "I would like arm please".

[kud1ing]

It's maybe -arch armv7 / -arch armv7s.

[alexcrichton]

How are you configuring rust? I couldn't even get libuv to build with an arm target.

[kud1ing]

I did it like is described here: https://github.com/mozilla/rust/wiki/Doc-building-for-ios
This is where the build process stopped for me.

libuv was portable to iOS joyent/libuv#243 at some point in time,

[kud1ing]

That's interesting, compilation fails in rt/arm/morestack.S now. The last change in this file was in October, while it worked for me in November. Was something regarding this enabled in the meantime?

/Users/lenny/Github/rust_ios/src/rt/arch/arm/morestack.S:11:7: error: unknown token in expression
.align
      ^
/Users/lenny/Github/rust_ios/src/rt/arch/arm/morestack.S:15:1: error: unknown directive
.hidden __morestack
^
/Users/lenny/Github/rust_ios/src/rt/arch/arm/morestack.S:19:2: error: unknown directive
 .type __morestack,%function
 ^
/Users/lenny/Github/rust_ios/src/rt/arch/arm/morestack.S:21:2: error: unknown directive
 .fnstart
 ^
/Users/lenny/Github/rust_ios/src/rt/arch/arm/morestack.S:23:2: error: unknown directive
 .save {r4, r5}
 ^
/Users/lenny/Github/rust_ios/src/rt/arch/arm/morestack.S:24:2: error: unknown directive
 .save {lr}
 ^
/Users/lenny/Github/rust_ios/src/rt/arch/arm/morestack.S:25:2: error: unknown directive
 .save {r6, fp, lr}
 ^
/Users/lenny/Github/rust_ios/src/rt/arch/arm/morestack.S:28:2: error: unknown directive
 .movsp r6
 ^
/Users/lenny/Github/rust_ios/src/rt/arch/arm/morestack.S:30:2: error: unknown directive
 .setfp fp, sp, #4
 ^
/Users/lenny/Github/rust_ios/src/rt/arch/arm/morestack.S:40:5: error: unknown directive
    .fnend

[adrientetar]

@kud1ing Have you tried this?

 .arm
-.align
+.align 2

 .global rust_stack_exhausted
 .global __morestack
 .hidden __morestack

[kud1ing]

I've opened the separate #11312 for the morestack.S compilation errors.

[kud1ing]

If i uncomment the offending assembler instructions i further down get errors like

src/libstd/libc.rs:2937:17: 2937:50 error: unresolved import: could not find `arch` in `libc::types::os`.
src/libstd/libc.rs:2937             use libc::types::os::arch::c95::c_int;
                                                                                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
src/libstd/libc.rs:2937:17: 2937:50 error: failed to resolve import `libc::types::os::arch::c95::c_int`
src/libstd/libc.rs:2937             use libc::types::os::arch::c95::c_int;
                                                                                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Any idea about this?

[alexcrichton]

There are probably blocks in libc.rs which need to have #[cfg(target_arch = "arm")] in the target_os = "macos" sections. It'd mostly just involve filling things out here and there.

[kud1ing]

Makes sense, thanks. I've opened the separate #11336 with a solving hint.

[adrientetar]

@kud1ing Globally speaking, this might help:
https://github.com/lht/rust/commits/ios-wip

[kud1ing]

@adridu59: Thanks, i'll add it to the wiki page.

[kud1ing]

Likely fixed by #14715