Bug 216718

Summary:

multimedia/ffmpeg: clang 4.0 crashes with -O3 -march=native

Product:

Ports & Packages

Reporter:

Jan Beich <jbeich>

Component:

Individual Port(s)

Assignee:

freebsd-multimedia (Nobody) <multimedia>

Status:

Closed FIXED

Severity:

Affects Only Me

CC:

dim, w.schwarzenfeld

Priority:

---

Keywords:

needs-patch

Version:

Latest

Flags:

bugzilla: maintainer-feedback? (multimedia)

Hardware:

i386

OS:

Any

See Also:

https://llvm.org/bugs/show_bug.cgi?id=31847

Bug Depends on:

Bug Blocks:

216008

Attachments:

Description	Flags
libavfilter/vf_waveform.c (preprocessed, compressed)	none
command line args (for clang 4.0)	none

Description Jan Beich freebsd_committer

2017-02-02 07:49:20 UTC

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

Comment 1 Jan Beich freebsd_committer

2017-02-02 07:50:32 UTC

Created attachment 179517 [details]
libavfilter/vf_waveform.c (preprocessed, compressed)

Comment 2 Jan Beich freebsd_committer

2017-02-02 07:52:36 UTC

Created attachment 179518 [details]
command line args (for clang 4.0)

Alternatively, one can do the following:

  $ cd /usr/ports/multimedia/ffmpeg
  $ make configure
  $ cd $(make -V WRKSRC)
  $ cc -m32 -O3 -march=haswell -I. -c libavfilter/vf_waveform.c

Comment 3 Dimitry Andric freebsd_committer

2017-02-02 12:09:18 UTC

Reproduced with llvm trunk r293557.  I submitted an upstream bug report here:
https://llvm.org/bugs/show_bug.cgi?id=31847

Comment 4 Walter Schwarzenfeld freebsd_triage

2018-01-10 03:25:22 UTC

If I understand this right
https://bugs.llvm.org/show_bug.cgi?id=31847

it seems done, and could be closed.

Comment 5 Jan Beich freebsd_committer

2018-01-10 08:21:58 UTC

Agree, I can't reproduce the crash on either FreeBSD 11.1 or via devel/llvm40 using either the attached sample or building the port on i386 with CPUTYPE set.