rust build seems to be stuck on macOS 10.12

[TitanNano]

I'm trying to upgrade rust on macOS 10.12 via homebrew but after some time of compiling, it seems to get stuck:

[100%] Building C object lib/builtins/CMakeFiles/clang_rt.builtins_x86_64_osx.dir/atomic_flag_test_and_set_explicit.c.o
[100%] Building C object lib/builtins/CMakeFiles/clang_rt.builtins_x86_64_osx.dir/atomic_signal_fence.c.o
[100%] Building C object lib/builtins/CMakeFiles/clang_rt.builtins_x86_64_osx.dir/atomic_thread_fence.c.o
[100%] Building C object lib/builtins/CMakeFiles/clang_rt.builtins_x86_64_osx.dir/emutls.c.o
[100%] Building C object lib/builtins/CMakeFiles/clang_rt.builtins_x86_64_osx.dir/gcc_personality_v0.c.o
[100%] Linking C static library libclang_rt.builtins_x86_64_osx.a
[100%] Built target clang_rt.builtins_x86_64_osx
cp: x86_64-apple-darwin/stage0/lib/rustlib/x86_64-apple-darwin/lib/libcompiler-rt.a
cp: x86_64-apple-darwin/stage1/lib/rustlib/x86_64-apple-darwin/lib/libcompiler-rt.a
cp: x86_64-apple-darwin/stage2/lib/rustlib/x86_64-apple-darwin/lib/libcompiler-rt.a
rustc: x86_64-apple-darwin/stage0/lib/rustlib/x86_64-apple-darwin/lib/libcore
rustc(71390,0x7fffc3b373c0) malloc: *** malloc_zone_unregister() failed for 0x7fffc3b2d000

It stays like this for hours...

[TimNN]

This is a duplicate of #34674 I believe.

[alexcrichton]

Indeed, thanks @TimNN!