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Hi, I'm using LLVM-3.8 (current SVN version) to optimize my code. After loop unrolling, I find there is 'undef' in the IR. For example, "*%.lcssa21.unr = phi double [ undef, %.lr.ph9 ], [ %13, %7 ]*". I have two questions: (1) Why this 'undef' is generated? Because before 'loop unrolling', there is no such 'undef'. (2) How LLVM backend deals with

Thanks: Eric Blake. --- src/Makefile.am | 1 + src/command.c | 7 ++---- src/guestfs-internal.h | 4 +++ src/launch-direct.c | 11 +++------ src/launch-uml.c | 11 +++------ src/umask.c | 10 ++------ src/wait.c | 67 ++++++++++++++++++++++++++++++++++++++++++++++++++ 7 files changed, 84 insertions(+), 27 deletions(-) create mode 100644

As Eric Blake noted in: https://www.redhat.com/archives/libguestfs/2016-April/msg00154.html libguestfs doesn't correctly handle the case where waitpid receives a SIGCHLD signal and the main program has registered a non-restartable signal handler. In this case waitpid would return -EINTR and we would print an error, but actually we should retry this case. This adds two new internal functions,