[all-commits] [llvm/llvm-project] 32ce14: Disable exit-on-SIGPIPE in lldb

[Vedant Kumar via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 32ce14e55e5a99dd99c3b4fd4bd0ccaaf2948c30
      https://github.com/llvm/llvm-project/commit/32ce14e55e5a99dd99c3b4fd4bd0ccaaf2948c30
  Author: Vedant Kumar <vsk at apple.com>
  Date:   2019-10-18 (Fri, 18 Oct 2019)

  Changed paths:
    M lldb/tools/driver/Driver.cpp
    M llvm/include/llvm/Support/Signals.h
    M llvm/lib/Support/Unix/Signals.inc
    M llvm/lib/Support/Windows/Signals.inc
    M llvm/unittests/Support/CMakeLists.txt
    A llvm/unittests/Support/SignalsTest.cpp

  Log Message:
  -----------
  Disable exit-on-SIGPIPE in lldb

Occasionally, during test teardown, LLDB writes to a closed pipe.
Sometimes the communication is inherently unreliable, so LLDB tries to
avoid being killed due to SIGPIPE (it calls `signal(SIGPIPE, SIG_IGN)`).
However, LLVM's default SIGPIPE behavior overrides LLDB's, causing it to
exit with IO_ERR.

Opt LLDB out of the default SIGPIPE behavior. I expect that this will
resolve some LLDB test suite flakiness (tests randomly failing with
IO_ERR) that we've seen since r344372.

rdar://55750240

Differential Revision: https://reviews.llvm.org/D69148

llvm-svn: 375288