[Bug 216718] multimedia/ffmpeg: clang 4.0 crashes with -O3 -march=native

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216718

            Bug ID: 216718
           Summary: multimedia/ffmpeg: clang 4.0 crashes with -O3
                    -march=native
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Keywords: needs-patch
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: multimedia at FreeBSD.org
          Reporter: jbeich at FreeBSD.org
                CC: dim at FreeBSD.org
            Blocks: 216008
          Assignee: multimedia at FreeBSD.org
             Flags: maintainer-feedback?(multimedia at FreeBSD.org)

ffmpeg already passes -O3 by default as part of OPTIMIZED_CFLAGS option, so
only CPUTYPE?=native in make.conf was something new.

Assertion failed: (isLoopInvariant(Operands[i], L) && "SCEVAddRecExpr operand
is not loop-invariant!"), function getAddRecExpr, file
/usr/src/contrib/llvm/lib/Analysis/ScalarEvolution.cpp, line 2963.
cc: error: unable to execute command: Abort trap
cc: error: clang frontend command failed due to signal (use -v to see
invocation)
FreeBSD clang version 4.0.0 (branches/release_40 293443) (based on LLVM 4.0.0)
Target: i386-unknown-freebsd12.0
Thread model: posix
InstalledDir: /usr/bin


Referenced Bugs:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216008
[Bug 216008] [exp-run] Update llvm/clang/compiler-rt/libc++/lld/lldb in base to
4.0.0
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