[Bug 242147] multimedia/ffmpeg: Illegal instruction on i586

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242147

Jan Beich <jbeich at FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Blocks|                            |210505
           Keywords|                            |regression

--- Comment #4 from Jan Beich <jbeich at FreeBSD.org> ---
Likely a regression from options refactor in graphics/opencv which makes i386
use -msse -msse2 -mfpmath=sse on all files. For runtime detection to work only
functions (or files) that use SSE2 instructions should be built with -msse2,
letting the caller check CPU features and decide whether to use optimized
functions. If the caller is built with -msse2 you get a crash on pre-SSE2
hardware. Unfortunately, upstream checks SSE2 support at compile time.

https://github.com/opencv/opencv/search?q=checkHardwareSupport
https://github.com/opencv/opencv/blob/3.4.1/cmake/OpenCVCompilerOptimizations.cmake#L71

While the following may help

  # OpenCV minimum SIMD without runtime detection
  CMAKE_ARGS+=  ${CMAKE_ARGS_${ARCH}}
  CMAKE_ARGS_amd64=-DCPU_BASELINE_DISABLE:STRING=SSE3
  CMAKE_ARGS_i386=-DCPU_BASELINE_DISABLE:STRING=SSE

it breaks building SIMD-optimized code

  FAILED: modules/core/CMakeFiles/opencv_core.dir/mathfuncs_core.avx.cpp.o 
  /usr/bin/c++  -DCVAPI_EXPORTS -D_USE_MATH_DEFINES -D__OPENCV_BUILD=1
-D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS
-DCV_CPU_COMPILE_AVX=1 -DCV_CPU_COMPILE_POPCNT=1 -DCV_CPU_COMPILE_SSE2=1
-DCV_CPU_COMPILE_SSE3=1 -DCV_CPU_COMPILE_SSE4_1=1 -DCV_CPU_COMPILE_SSE4_2=1
-DCV_CPU_COMPILE_SSE=1 -DCV_CPU_COMPILE_SSSE3=1 -DCV_CPU_DISPATCH_MODE=AVX
-I/wrkdirs/usr/ports/graphics/opencv-core/work/opencv-3.4.1/modules/core/include
-I/wrkdirs/usr/ports/graphics/opencv-core/work/opencv-3.4.1/modules/core/src
-Imodules/core -isystem . -isystem /usr/local/include/eigen3 -O2 -pipe 
-fstack-protector-strong -isystem /usr/local/include -fno-strict-aliasing  
-isystem /usr/local/include -std=c++11   -fsigned-char -W -Wall
-Werror=return-type -Werror=non-virtual-dtor -Werror=address
-Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations
-Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith
-Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wno-narrowing
-Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -Wno-comment
-Wno-implicit-fallthrough -fdiagnostics-show-option -pthread -Qunused-arguments
-fomit-frame-pointer -ffunction-sections -fdata-sections  -mfpmath=387
-fvisibility=hidden -fvisibility-inlines-hidden -O2 -pipe 
-fstack-protector-strong -isystem /usr/local/include -fno-strict-aliasing  
-isystem /usr/local/include -std=c++11  -DNDEBUG -fPIC   -std=c++11  -msse
-msse2 -msse3 -mssse3 -msse4.1 -mpopcnt -msse4.2 -mavx -MD -MT
modules/core/CMakeFiles/opencv_core.dir/mathfuncs_core.avx.cpp.o -MF
modules/core/CMakeFiles/opencv_core.dir/mathfuncs_core.avx.cpp.o.d -o
modules/core/CMakeFiles/opencv_core.dir/mathfuncs_core.avx.cpp.o -c
modules/core/mathfuncs_core.avx.cpp
  error: the '387' unit is not supported with this instruction set


Referenced Bugs:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210505
[Bug 210505] [exp-run] graphics/opencv: Update to 3.4.1
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