Commits on Oct 25, 2019

1. [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
   
   (cherry picked from commit 0877dd1)

   

   vedantk committed Oct 25, 2019
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