rustc unexpected failure path 'needs a temp dir'

[dmanescu]

When compiling without a valid temp directory (i.e. TMPDIR environment variable) rustc issues the following error:

error: internal compiler error: unexpected failure
note: the compiler hit an unexpected failure path. this is a bug.
note: we would appreciate a bug report: http://doc.rust-lang.org/complement-bugreport.html
note: run with `RUST_BACKTRACE=1` for a backtrace
task 'rustc' failed at 'needs a temp dir', /path/to/rust/src/libstd/option.rs:167

[huonw]

Minimal example:

$ TMPDIR=fake rustc - <<< 'fn main() {}'
error: internal compiler error: unexpected failure
note: the compiler hit an unexpected failure path. this is a bug.
note: we would appreciate a bug report: http://doc.rust-lang.org/complement-bugreport.html
note: run with `RUST_BACKTRACE=1` for a backtrace
task 'rustc' failed at 'needs a temp dir', /home/rustbuild/src/rust-buildbot/slave/nightly-linux/build/src/libcore/option.rs:246

Backtrace:

   1:     0x7fb7528c44c0 - rt::backtrace::imp::write::hc141f98b309f96020vx::v0.11.0.pre
   2:     0x7fb75284c690 - rt::unwind::begin_unwind_inner::h750099d3e14072d315w::v0.11.0.pre
   3:     0x7fb7528448c0 - rt::unwind::begin_unwind_fmt::hef19b0403fbee428b5w::v0.11.0.pre
   4:     0x7fb7528c4260 - rust_begin_unwind
   5:     0x7fb75290df90 - failure::begin_unwind::h6a8ab74fb77e791aMZv::v0.11.0.pre
   6:     0x7fb7538ffbc0 - back::link::link_natively::h67bd5d7dd321fb869z8::v0.11.0.pre
   7:     0x7fb7538faaa0 - back::link::link_binary::hdbadb636fdce1355Ad8::v0.11.0.pre
   8:     0x7fb75399c570 - driver::driver::phase_6_link_output::h6b9e3b205a4abd13xNm::v0.11.0.pre
   9:     0x7fb753990780 - driver::driver::compile_input::h87aeeec375cfdeceAsm::v0.11.0.pre
  10:     0x7fb753a5cdd0 - driver::run_compiler::hc15d974bd69c9202j7o::v0.11.0.pre
  11:     0x7fb753a5ccf0 - driver::main_args::closure.94805
  12:     0x7fb753a71ff0 - driver::monitor::closure.95876
  13:     0x7fb753a6d3d0 - task::TaskBuilder::try::closure.95639
  14:     0x7fb755a797f0 - task::spawn_opts::closure.7844
  15:     0x7fb7528be8f0 - rt::task::Task::run::closure.25203
  16:     0x7fb752928890 - rust_try
  17:     0x7fb7528be840 - rt::task::Task::run::h35032c49d09a27e0FUu::v0.11.0.pre
  18:     0x7fb755a795a0 - task::spawn_opts::closure.7817
  19:     0x7fb7528c2890 - rt::thread::thread_start::h4bb4efb79a43c494dEv::v0.11.0.pre
  20:     0x7fb75220ffa0 - start_thread
  21:     0x7fb75250aa09 - __clone
  22:                0x0 - <unknown>

[steveklabnik]

Triage: still get an ICE today.

[tamird]

Still an ICE.