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Summary

  1. [Driver] Force llvm to install its handlers before lldb's (details)
Commit 0877dd14e4e85550f8e267b5ceeff1d3409c41ba by Vedant Kumar
[Driver] Force llvm to install its handlers before lldb's
Install llvm's signal handlers up front to prevent lldb's handlers from
being ignored. This is (hopefully) a stopgap workaround.
When lldb invokes an llvm API that installs signal handlers (e.g.
llvm::sys::RemoveFileOnSignal, possibly via a compiler embedded within
lldb), lldb's signal handlers are overriden if llvm is installing its
handlers for the first time.
To work around llvm's behavior, force it to install its handlers up
front, and
*then* install lldb's handlers. In practice this is used to prevent lldb
test processes from exiting due to IO_ERR when SIGPIPE is received.
Note that when llvm installs its handlers, it 1) records the old
handlers it replaces and 2) re-installs the old handlers when its new
handler is invoked. That means that a signal not explicitly handled by
lldb can fall back to being handled by llvm's handler the first time it
is received, and then by the default handler the second time it is
received.
Differential Revision: https://reviews.llvm.org/D69403
The file was modifiedlldb/tools/driver/Driver.cpp