Not sure why this is happening since I thought Rust was already using their own version of the compiler.

Please take a look.

https://logs.chromium.org/v/?s=chromeos%2Fbb%2Fchromiumos.tryserver%2Fchromiumos-sdk%2F2652%2F%2B%2Frecipes%2Fsteps%2FSDKBuildToolchains%2F0%2Fstdout

rust-1.21.0-r3: error: linking with `cc` failed: exit code: 1
rust-1.21.0-r3:   |
rust-1.21.0-r3:   = note: "cc" "-Wl,--as-needed" "-Wl,-z,noexecstack" "-m64" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-sysroot/lib/rustlib/x86_64-unknown-linux-gnu/lib" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.0.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.1.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.10.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.11.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.12.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.13.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.14.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.15.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.16.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.17.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.18.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.19.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.2.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.20.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.21.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.22.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.23.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.24.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.25.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.26.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.27.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.28.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.29.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.3.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.30.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.31.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.32.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.33.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.34.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.35.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.36.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.37.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.38.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.39.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.4.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.5.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.6.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.7.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.8.o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.9.o" "-o" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/rustc-d6af06475aa14af5.crate.allocator.o" "-Wl,--gc-sections" "-pie" "-Wl,-O1" "-nodefaultlibs" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/release/deps" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/build/miniz-sys-62af5d953ffb2cd4/out" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/build/rustc_llvm-ed91e068fc25c5c8/out" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/llvm/lib" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-sysroot/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps" "-l" "rustc_driver-b1ea7f3396f7c460" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps" "-l" "rustc_lint-415e2a392a93717b" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps" "-l" "rustc_passes-843ea62fb630a9ab" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps" "-l" "rustc_privacy-76f677c5595535ce" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps" "-l" "rustc_borrowck-eb4c3bff7e44af96" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps" "-l" "rustc_mir-811d6854bd8ddf62" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps" "-l" "rustc_const_eval-f5291544f057d1a0" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps" "-l" "rustc_save_analysis-ff38b2b2e4b77e03" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps" "-l" "rustc_typeck-15a06b8451c3bb22" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps" "-l" "rustc_trans-46fb7dc38ffea756" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps" "-l" "rustc_trans_utils-52110d4f0eb74a55" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps" "-l" "rustc_platform_intrinsics-228a428b1705bf41" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps" "-l" "rustc_llvm-684bce363959664b" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps" "-l" "rustc_incremental-ec156fd863085f3f" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps" "-l" "rustc_allocator-e8c0f0ca891350b8" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps" "-l" "rustc_plugin-f2b239ec002f5b5f" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps" "-l" "rustc_metadata-5c9d9b125e74a53e" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps" "-l" "syntax_ext-8e3a1452151f48f9" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps" "-l" "proc_macro-9d53d92af12c3f3b" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps" "-l" "rustc_resolve-9f9c9ad2700eca93" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps" "-l" "rustc-4696be0220f537f5" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-sysroot/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-l" "test-8aa1885f42c5f6a0" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps" "-l" "rustc_const_math-26d8a8722d637859" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps" "-l" "rustc_back-4ee0563d8afd177d" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps" "-l" "graphviz-056ec35d00d387a1" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps" "-l" "fmt_macros-d99937eb16562928" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps" "-l" "arena-9ab61d14f608d534" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps" "-l" "syntax-f48cc13a0772c56e" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps" "-l" "rustc_errors-2484841871e56516" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps" "-l" "syntax_pos-81c4fa3fcb4f5a44" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps" "-l" "rustc_data_structures-e3678ebda9a4c89c" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-sysroot/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-l" "term-09fcb0cebc7e32cb" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps" "-l" "serialize-2875d5e8ad7eb126" "-L" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-sysroot/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-l" "std-d042d7e60b1ba1e6" "-Wl,-Bstatic" "/var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-sysroot/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-382cb75c24aecbde.rlib" "-Wl,-Bdynamic" "-l" "rt" "-l" "dl" "-l" "pthread" "-l" "m" "-l" "stdc++" "-l" "util" "-l" "dl" "-l" "rt" "-l" "pthread" "-l" "gcc_s" "-l" "c" "-l" "m" "-l" "rt" "-l" "pthread" "-l" "util" "-Wl,-rpath,$ORIGIN/../lib:/usr/lib64/rust/rustlib/x86_64-unknown-linux-gnu/lib"
rust-1.21.0-r3:   = note: /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::__shared_weak_count::lock()'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::ios_base::getloc() const'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::__thread_struct::~__thread_struct()'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::error_category::equivalent(std::__1::error_code const&, int) const'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::error_category::default_error_condition(int) const'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::error_category::equivalent(int, std::__1::error_condition const&) const'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::generic_category()'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::locale::~locale()'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::promise<void>::promise()'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::__shared_weak_count::__get_deleter(std::type_info const&) const'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::num_put<char, std::__1::ostreambuf_iterator<char, std::__1::char_traits<char> > >::id'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::thread::hardware_concurrency()'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::__shared_weak_count::__release_weak()'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::error_code::message() const'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::shared_future<void>::~shared_future()'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::ios_base::clear(unsigned int)'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::__throw_system_error(int, char const*)'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::ios_base::~ios_base()'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::promise<void>::set_value()'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::mutex::lock()'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::locale::use_facet(std::__1::locale::id&) const'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::condition_variable::notify_all()'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::system_category()'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::locale::locale()'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::promise<void>::~promise()'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::__thread_local_data()'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::chrono::steady_clock::now()'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::codecvt<char, char, __mbstate_t>::id'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::__shared_weak_count::~__shared_weak_count()'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::chrono::system_clock::from_time_t(long)'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::locale::locale(std::__1::locale const&)'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::ios_base::init(void*)'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::condition_variable::~condition_variable()'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::condition_variable::notify_one()'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::mutex::unlock()'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::__next_prime(unsigned long)'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::mutex::~mutex()'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::locale::has_facet(std::__1::locale::id&) const'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::promise<void>::get_future()'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::thread::join()'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::ctype<char>::id'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::__thread_struct::__thread_struct()'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::error_category::~error_category()'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::future<void>::~future()'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::chrono::system_clock::to_time_t(std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000l> > > const&)'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::exception_ptr::~exception_ptr()'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::num_get<char, std::__1::istreambuf_iterator<char, std::__1::char_traits<char> > >::id'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::chrono::system_clock::now()'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::__call_once(unsigned long volatile&, void*, void (*)(void*))'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::thread::~thread()'
rust-1.21.0-r3:           /var/tmp/portage/dev-lang/rust-1.21.0-r3/work/rustc-1.21.0-src/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_llvm-684bce363959664b.so: undefined reference to `std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&)'
rust-1.21.0-r3:           collect2: error: ld returned 1 exit status