llvm dev - Jun 2018 - Miscompilation while switching from clang-4 to clang-5

2018-06-01 2:06 GMT-05:00 Alex Denisov <1101.debian at
gmail.com>:
> If there are any other hints: send them my way :)
Debug with gdb, but a breakpoint at
https://github.com/llvm-mirror/llvm/blob/master/lib/Transforms/Utils/SymbolRewriter.cpp#L91.
It should hit twice (which is the error reported). At each break you
can look at where the machine code is coming from (e.g. a shared
object), and which static analyzer calls it.

Michael

Thank you, everyone, for the help.

As a followup:
I tried to svn-bisect and find the place where the change was introduced, but I
cannot find a good commit: whenever I use clang built from sources I see the
same problem "CommandLine Error" as with clang-5.
I am sure that the very specific is in our build system setup, but I am still
curious where the difference comes from.
I may do another debugging round, but not sure if I am ready to invest more time
into it.

Cheers,
Alex.
--
AlexDenisov
Software Engineer, https://lowlevelbits.org
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2018-06-04 4:42 GMT-05:00 Alex Denisov <1101.debian at
gmail.com>:
> Thank you, everyone, for the help.
>
> As a followup:
> I tried to svn-bisect and find the place where the change was introduced,
but I cannot find a good commit: whenever I use clang built from sources I see
the same problem "CommandLine Error" as with clang-5.
> I am sure that the very specific is in our build system setup, but I am
still curious where the difference comes from.
> I may do another debugging round, but not sure if I am ready to invest more
time into it.
I'd assume this has more to do with your system's configuration. Be
sure to have just a single compiled LLVM on your system (e.g. remove
your distribution's llvm package etc). Did you try on another system?

Michael