Error to build OpenCV 4.0.1 in Debug mode from source

[nikitaverbis]

System information (version)

• OpenCV => 4.0.1
• Operating System / Platform => Windows 10 64 Bit
• Compiler => MinGW 7.3.0 x64 (from last Qt 5.12)
• CMake => 3.13.2
  -Build Type => Source (4.0.1 from https://github.com/opencv/opencv/releases)

Detailed description

Can not to build OpenCV 4.0.1 in Debug mode.
An error is raised during compilation:
Fatal error: can't close CMakeFiles\opencv_perf_core.dir\perf\opencl\perf_arithm.cpp.obj: File too big
Which probably can be solved with flags for gcc: -Wa,-mbig-obj.

Steps to reproduce

1. Install Qt 5.12 with Tools: MinGW 7.3.0
2. Install CMake 3.13.2
3. Run CMake and set path to opencv source code and path to build binaries and press Configure button.
4. In CMAKE group set CMAKE_BUILD_TYPE to Debug.
5. Press Generate button.
6. Open CMD and change dir to opencv "build binaries" folder from step 3 and execute mingw32-make.exe -j8 (Example: D:\Qt\Tools\mingw730_64\bin\mingw32-make.exe -j8).

Error

 [ 28%] Built target pch_Generate_opencv_highgui
 [ 28%] Built target opencv_highgui
 [ 28%] Built target opencv_ts_pch_dephelp
 [ 28%] Built target pch_Generate_opencv_ts
 [ 29%] Built target opencv_ts
 [ 29%] Building CXX object modules/core/CMakeFiles/opencv_perf_core.dir/perf/opencl/perf_arithm.cpp.obj
 D:/Qt/Tools/mingw730_64/bin/../lib/gcc/x86_64-w64-mingw32/7.3.0/../../../../x86_64-w64-mingw32/bin/as.exe: CMakeFiles\opencv_perf_core.dir\perf\opencl\perf_arithm.cpp.obj: too many sections (37620)
 C:\Users\User\AppData\Local\Temp\ccWlqdOA.s: Assembler messages:
 C:\Users\User\AppData\Local\Temp\ccWlqdOA.s: Fatal error: can't fill 1 byte in section .rdata$_ZStL19piecewise_construct of CMakeFiles\opencv_perf_core.dir\perf\opencl\perf_arithm.cpp.obj: 'File too big'
 D:/Qt/Tools/mingw730_64/bin/../lib/gcc/x86_64-w64-mingw32/7.3.0/../../../../x86_64-w64-mingw32/bin/as.exe: CMakeFiles\opencv_perf_core.dir\perf\opencl\perf_arithm.cpp.obj: too many sections (37620)
 C:\Users\User\AppData\Local\Temp\ccWlqdOA.s: Fatal error: can't close CMakeFiles\opencv_perf_core.dir\perf\opencl\perf_arithm.cpp.obj: File too big
 mingw32-make[2]: *** [modules\core\CMakeFiles\opencv_perf_core.dir\build.make:77: modules/core/CMakeFiles/opencv_perf_core.dir/perf/opencl/perf_arithm.cpp.obj] Error 1
 mingw32-make[1]: *** [CMakeFiles\Makefile2:2712: modules/core/CMakeFiles/opencv_perf_core.dir/all] Error 2
 mingw32-make: *** [Makefile:162: all] Error 2

[alalek]

MinGW

We don't support this configuration, so we don't have environments with this setup.

Feel free to investigate issue and propose PR.

[nikitaverbis]

Silved the problem by changing compilation flag -O0 to -O3 in file OpenCVCompilerOptions.cmake:
set(OPENCV_EXTRA_FLAGS_DEBUG "${OPENCV_EXTRA_FLAGS_DEBUG} -O0")
to
set(OPENCV_EXTRA_FLAGS_DEBUG "${OPENCV_EXTRA_FLAGS_DEBUG} -O3")

[lovemory]

[ 52%] Built target example_tapi_hog
Consolidate compiler generated dependencies of target opencv_test_core
[ 55%] Built target opencv_test_core
Consolidate compiler generated dependencies of target opencv_perf_core
[ 55%] Building CXX object modules/core/CMakeFiles/opencv_perf_core.dir/perf/opencl/perf_arithm.cpp.obj
E:/mingw-w64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/8.1.0/../../../../x86_64-w64-mingw32/bin/as.exe: CMakeFiles\opencv_perf_core.dir\perf\opencl\perf_arithm.cpp.obj: too many sections (37552)
C:\Users\ADMINI~1\AppData\Local\Temp\ccSwuAFd.s: Assembler messages:
C:\Users\ADMINI~1\AppData\Local\Temp\ccSwuAFd.s: Fatal error: can't write 9 bytes to section .text$_ZNSt14numeric_limitsIfE9quiet_NaNEv of CMakeFiles\opencv_perf_core.dir\perf\opencl\perf_arithm.cpp.obj: 'File too big'
E:/mingw-w64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/8.1.0/../../../../x86_64-w64-mingw32/bin/as.exe: CMakeFiles\opencv_perf_core.dir\perf\opencl\perf_arithm.cpp.obj: too many sections (37552)
C:\Users\ADMINI~1\AppData\Local\Temp\ccSwuAFd.s: Fatal error: can't close CMakeFiles\opencv_perf_core.dir\perf\opencl\perf_arithm.cpp.obj: File too big
mingw32-make[2]: *** [modules\core\CMakeFiles\opencv_perf_core.dir\build.make:91: modules/core/CMakeFiles/opencv_perf_core.dir/perf/opencl/perf_arithm.cpp.obj] Error 1
mingw32-make[1]: *** [CMakeFiles\Makefile2:2395: modules/core/CMakeFiles/opencv_perf_core.dir/all] Error 2
mingw32-make[1]: *** Waiting for unfinished jobs....
[ 55%] Built target example_tapi_camshift
[ 55%] Built target example_tapi_dense_optical_flow
[ 55%] Built target example_tapi_squares
[ 55%] Built target example_tapi_ufacedetect
[ 55%] Built target example_tapi_pyrlk_optical_flow
[ 55%] Built target example_dnn_segmentation
[ 55%] Built target example_dnn_text_detection
mingw32-make: *** [Makefile:165: all] Error 2

I meet the same error.

[tanyushaaa]

i adeed into this file
"C:\dev\opencv-4.5.2\release\CMakeFiles\3.21.0-rc2\CMakeCXXCompiler.cmake"
this txt
set(CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS} "-O3")
and got needed result