<h5 dir="auto">System information (version)</h5>

<ul dir="auto">
<li>OpenCV =&gt; 4.1</li>
<li>Operating System / Platform =&gt; Ubuntu 18.04.2 LTS</li>
<li>Compiler =&gt; g++ (Ubuntu 7.3.0-27ubuntu1~18.04) 7.3.0</li>
</ul>
<h5 dir="auto">Detailed description</h5>
<details>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="Build output check failed:
Regex: 'unrecognized .*option'
    Output line: 'cc1: warning: unrecognized command line option ‘-Wno-shorten-64-to-32’'
Compilation failed:
    source file: '~/opencv-master/build/CMakeFiles/CMakeTmp/src.c'
    check option: ' -Wno-shorten-64-to-32'
===== BUILD LOG =====
Change Dir: ~/opencv-master/build/CMakeFiles/CMakeTmp

Run Build Command:&quot;/usr/bin/make&quot; &quot;cmTC_b6735/fast&quot;
/usr/bin/make -f CMakeFiles/cmTC_b6735.dir/build.make CMakeFiles/cmTC_b6735.dir/build
make[1]: Entering directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_b6735.dir/src.c.o
/usr/bin/gcc   -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffast-math -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -Wno-unused-parameter -Wno-sign-compare  -O3 -DNDEBUG -fPIE   -Wno-shorten-64-to-32 -o CMakeFiles/cmTC_b6735.dir/src.c.o   -c ~/opencv-master/build/CMakeFiles/CMakeTmp/src.c
~/opencv-master/build/CMakeFiles/CMakeTmp/src.c:1:0: warning: ignoring #pragma   [-Wunknown-pragmas]
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cc1: warning: unrecognized command line option ‘-Wno-shorten-64-to-32’
Linking C executable cmTC_b6735
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/usr/bin/gcc    -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffast-math -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -Wno-unused-parameter -Wno-sign-compare  -O3 -DNDEBUG    -Wl,--gc-sections  CMakeFiles/cmTC_b6735.dir/src.c.o  -o cmTC_b6735 
make[1]: Leaving directory '~/opencv-master/build/CMakeFiles/CMakeTmp'

===== END =====

Determining if the include file io.h exists failed with the following output:
Change Dir: ~/opencv-master/build/CMakeFiles/CMakeTmp

Run Build Command:&quot;/usr/bin/make&quot; &quot;cmTC_9bfa5/fast&quot;
/usr/bin/make -f CMakeFiles/cmTC_9bfa5.dir/build.make CMakeFiles/cmTC_9bfa5.dir/build
make[1]: Entering directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_9bfa5.dir/CheckIncludeFile.c.o
/usr/bin/gcc   -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffast-math -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden  -O3 -DNDEBUG -fPIE   -o CMakeFiles/cmTC_9bfa5.dir/CheckIncludeFile.c.o   -c ~/opencv-master/build/CMakeFiles/CMakeTmp/CheckIncludeFile.c
~/opencv-master/build/CMakeFiles/CMakeTmp/CheckIncludeFile.c:1:10: fatal error: io.h: No such file or directory
 #include &lt;io.h&gt;
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compilation terminated.
CMakeFiles/cmTC_9bfa5.dir/build.make:65: recipe for target 'CMakeFiles/cmTC_9bfa5.dir/CheckIncludeFile.c.o' failed
make[1]: *** [CMakeFiles/cmTC_9bfa5.dir/CheckIncludeFile.c.o] Error 1
make[1]: Leaving directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_9bfa5/fast' failed
make: *** [cmTC_9bfa5/fast] Error 2


Determining size of INT8 failed with the following output:
Change Dir: ~/opencv-master/build/CMakeFiles/CMakeTmp

Run Build Command:&quot;/usr/bin/make&quot; &quot;cmTC_c5d39/fast&quot;
/usr/bin/make -f CMakeFiles/cmTC_c5d39.dir/build.make CMakeFiles/cmTC_c5d39.dir/build
make[1]: Entering directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_c5d39.dir/int8.c.o
/usr/bin/gcc   -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffast-math -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden  -O3 -DNDEBUG -fPIE   -o CMakeFiles/cmTC_c5d39.dir/int8.c.o   -c ~/opencv-master/build/CMakeFiles/CheckTypeSize/int8.c
~/opencv-master/build/CMakeFiles/CheckTypeSize/int8.c:23:22: error: ‘INT8’ undeclared here (not in a function); did you mean ‘INT8_C’?
 #define SIZE (sizeof(INT8))
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~/opencv-master/build/CMakeFiles/CheckTypeSize/int8.c:25:12: note: in expansion of macro ‘SIZE’
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CMakeFiles/cmTC_c5d39.dir/build.make:65: recipe for target 'CMakeFiles/cmTC_c5d39.dir/int8.c.o' failed
make[1]: *** [CMakeFiles/cmTC_c5d39.dir/int8.c.o] Error 1
make[1]: Leaving directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_c5d39/fast' failed
make: *** [cmTC_c5d39/fast] Error 2

~/opencv-master/build/CMakeFiles/CheckTypeSize/int8.c:
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Determining size of INT16 failed with the following output:
Change Dir: ~/opencv-master/build/CMakeFiles/CMakeTmp

Run Build Command:&quot;/usr/bin/make&quot; &quot;cmTC_a4877/fast&quot;
/usr/bin/make -f CMakeFiles/cmTC_a4877.dir/build.make CMakeFiles/cmTC_a4877.dir/build
make[1]: Entering directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_a4877.dir/int16.c.o
/usr/bin/gcc   -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffast-math -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden  -O3 -DNDEBUG -fPIE   -o CMakeFiles/cmTC_a4877.dir/int16.c.o   -c ~/opencv-master/build/CMakeFiles/CheckTypeSize/int16.c
~/opencv-master/build/CMakeFiles/CheckTypeSize/int16.c:23:22: error: ‘INT16’ undeclared here (not in a function); did you mean ‘INT16_C’?
 #define SIZE (sizeof(INT16))
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~/opencv-master/build/CMakeFiles/CheckTypeSize/int16.c:25:12: note: in expansion of macro ‘SIZE’
   ('0' + ((SIZE / 10000)%10)),
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CMakeFiles/cmTC_a4877.dir/build.make:65: recipe for target 'CMakeFiles/cmTC_a4877.dir/int16.c.o' failed
make[1]: *** [CMakeFiles/cmTC_a4877.dir/int16.c.o] Error 1
make[1]: Leaving directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_a4877/fast' failed
make: *** [cmTC_a4877/fast] Error 2

~/opencv-master/build/CMakeFiles/CheckTypeSize/int16.c:
#include &lt;sys/types.h&gt;
#include &lt;stdint.h&gt;
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Determining size of INT32 failed with the following output:
Change Dir: ~/opencv-master/build/CMakeFiles/CMakeTmp

Run Build Command:&quot;/usr/bin/make&quot; &quot;cmTC_20741/fast&quot;
/usr/bin/make -f CMakeFiles/cmTC_20741.dir/build.make CMakeFiles/cmTC_20741.dir/build
make[1]: Entering directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_20741.dir/int32.c.o
/usr/bin/gcc   -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffast-math -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden  -O3 -DNDEBUG -fPIE   -o CMakeFiles/cmTC_20741.dir/int32.c.o   -c ~/opencv-master/build/CMakeFiles/CheckTypeSize/int32.c
~/opencv-master/build/CMakeFiles/CheckTypeSize/int32.c:23:22: error: ‘INT32’ undeclared here (not in a function); did you mean ‘INT32_C’?
 #define SIZE (sizeof(INT32))
                      ^
~/opencv-master/build/CMakeFiles/CheckTypeSize/int32.c:25:12: note: in expansion of macro ‘SIZE’
   ('0' + ((SIZE / 10000)%10)),
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CMakeFiles/cmTC_20741.dir/build.make:65: recipe for target 'CMakeFiles/cmTC_20741.dir/int32.c.o' failed
make[1]: *** [CMakeFiles/cmTC_20741.dir/int32.c.o] Error 1
make[1]: Leaving directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_20741/fast' failed
make: *** [cmTC_20741/fast] Error 2

~/opencv-master/build/CMakeFiles/CheckTypeSize/int32.c:
#include &lt;sys/types.h&gt;
#include &lt;stdint.h&gt;
#include &lt;stddef.h&gt;


#undef KEY
#if defined(__i386)
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#elif defined(__x86_64)
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#elif defined(__ARM_ARCH_7A__)
# define KEY '_','_','A','R','M','_','A','R','C','H','_','7','A','_','_'
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# define KEY '_','_','A','R','M','_','A','R','C','H','_','7','S','_','_'
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#define SIZE (sizeof(INT32))
char info_size[] =  {'I', 'N', 'F', 'O', ':', 's','i','z','e','[',
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Determining if the function setmode exists failed with the following output:
Change Dir: ~/opencv-master/build/CMakeFiles/CMakeTmp

Run Build Command:&quot;/usr/bin/make&quot; &quot;cmTC_fd91a/fast&quot;
/usr/bin/make -f CMakeFiles/cmTC_fd91a.dir/build.make CMakeFiles/cmTC_fd91a.dir/build
make[1]: Entering directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_fd91a.dir/CheckFunctionExists.c.o
/usr/bin/gcc   -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffast-math -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -DCHECK_FUNCTION_EXISTS=setmode -O3 -DNDEBUG -fPIE   -o CMakeFiles/cmTC_fd91a.dir/CheckFunctionExists.c.o   -c /usr/share/cmake-3.10/Modules/CheckFunctionExists.c
Linking C executable cmTC_fd91a
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_fd91a.dir/link.txt --verbose=1
/usr/bin/gcc    -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffast-math -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -DCHECK_FUNCTION_EXISTS=setmode -O3 -DNDEBUG    -Wl,--gc-sections  CMakeFiles/cmTC_fd91a.dir/CheckFunctionExists.c.o  -o cmTC_fd91a 
CMakeFiles/cmTC_fd91a.dir/CheckFunctionExists.c.o: In function `main':
CheckFunctionExists.c:(.text.startup.main+0xc): undefined reference to `setmode'
collect2: error: ld returned 1 exit status
CMakeFiles/cmTC_fd91a.dir/build.make:97: recipe for target 'cmTC_fd91a' failed
make[1]: *** [cmTC_fd91a] Error 1
make[1]: Leaving directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_fd91a/fast' failed
make: *** [cmTC_fd91a/fast] Error 2


Build output check failed:
    Regex: 'command line option .* is valid for .* but not for C\+\+'
    Output line: 'cc1plus: warning: command line option ‘-Wno-missing-prototypes’ is valid for C/ObjC but not for C++'
Compilation failed:
    source file: '~/opencv-master/build/CMakeFiles/CMakeTmp/src.cxx'
    check option: ' -Wno-missing-prototypes'
===== BUILD LOG =====
Change Dir: ~/opencv-master/build/CMakeFiles/CMakeTmp

Run Build Command:&quot;/usr/bin/make&quot; &quot;cmTC_fc97d/fast&quot;
/usr/bin/make -f CMakeFiles/cmTC_fc97d.dir/build.make CMakeFiles/cmTC_fc97d.dir/build
make[1]: Entering directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_fc97d.dir/src.cxx.o
/usr/bin/g++    -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffast-math -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -Wno-missing-declarations -Wno-unused-parameter  -O3 -DNDEBUG -fPIE   -Wno-missing-prototypes -std=c++11 -o CMakeFiles/cmTC_fc97d.dir/src.cxx.o -c ~/opencv-master/build/CMakeFiles/CMakeTmp/src.cxx
cc1plus: warning: command line option ‘-Wno-missing-prototypes’ is valid for C/ObjC but not for C++
~/opencv-master/build/CMakeFiles/CMakeTmp/src.cxx:1:0: warning: ignoring #pragma   [-Wunknown-pragmas]
 #pragma
 
Linking CXX executable cmTC_fc97d
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_fc97d.dir/link.txt --verbose=1
/usr/bin/g++     -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffast-math -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -Wno-missing-declarations -Wno-unused-parameter  -O3 -DNDEBUG    -Wl,--gc-sections  CMakeFiles/cmTC_fc97d.dir/src.cxx.o  -o cmTC_fc97d 
make[1]: Leaving directory '~/opencv-master/build/CMakeFiles/CMakeTmp'

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Build output check failed:
    Regex: 'unrecognized .*option'
    Output line: 'cc1: warning: unrecognized command line option ‘-Wno-absolute-value’'
Compilation failed:
    source file: '~/opencv-master/build/CMakeFiles/CMakeTmp/src.c'
    check option: ' -Wno-absolute-value'
===== BUILD LOG =====
Change Dir: ~/opencv-master/build/CMakeFiles/CMakeTmp

Run Build Command:&quot;/usr/bin/make&quot; &quot;cmTC_576bd/fast&quot;
/usr/bin/make -f CMakeFiles/cmTC_576bd.dir/build.make CMakeFiles/cmTC_576bd.dir/build
make[1]: Entering directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_576bd.dir/src.c.o
/usr/bin/gcc   -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wundef -Winit-self -Wpointer-arith -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffast-math -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -Wno-implicit-function-declaration -Wno-uninitialized -Wno-missing-prototypes -Wno-unused-but-set-parameter -Wno-missing-declarations -Wno-unused -Wno-shadow -Wno-sign-compare -Wno-strict-overflow -Wno-pointer-compare  -O3 -DNDEBUG -fPIE   -Wno-absolute-value -o CMakeFiles/cmTC_576bd.dir/src.c.o   -c ~/opencv-master/build/CMakeFiles/CMakeTmp/src.c
~/opencv-master/build/CMakeFiles/CMakeTmp/src.c:1:0: warning: ignoring #pragma   [-Wunknown-pragmas]
 #pragma
 
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Linking C executable cmTC_576bd
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/usr/bin/gcc    -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wundef -Winit-self -Wpointer-arith -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffast-math -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -Wno-implicit-function-declaration -Wno-uninitialized -Wno-missing-prototypes -Wno-unused-but-set-parameter -Wno-missing-declarations -Wno-unused -Wno-shadow -Wno-sign-compare -Wno-strict-overflow -Wno-pointer-compare  -O3 -DNDEBUG    -Wl,--gc-sections  CMakeFiles/cmTC_576bd.dir/src.c.o  -o cmTC_576bd 
make[1]: Leaving directory '~/opencv-master/build/CMakeFiles/CMakeTmp'

===== END =====

Build output check failed:
    Regex: 'unrecognized .*option'
    Output line: 'cc1plus: warning: unrecognized command line option ‘-Wno-inconsistent-missing-override’'
Compilation failed:
    source file: '~/opencv-master/build/CMakeFiles/CMakeTmp/src.cxx'
    check option: ' -Wno-inconsistent-missing-override'
===== BUILD LOG =====
Change Dir: ~/opencv-master/build/CMakeFiles/CMakeTmp

Run Build Command:&quot;/usr/bin/make&quot; &quot;cmTC_ca285/fast&quot;
/usr/bin/make -f CMakeFiles/cmTC_ca285.dir/build.make CMakeFiles/cmTC_ca285.dir/build
make[1]: Entering directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_ca285.dir/src.cxx.o
/usr/bin/g++    -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Winit-self -Wpointer-arith -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffast-math -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -Wno-shadow -Wno-unused -Wno-sign-compare -Wno-undef -Wno-missing-declarations -Wno-uninitialized -Wno-switch -Wno-parentheses -Wno-array-bounds -Wno-extra -Wno-deprecated-declarations -Wno-misleading-indentation -Wno-deprecated -Wno-suggest-override  -O3 -DNDEBUG -fPIE   -Wno-inconsistent-missing-override -std=c++11 -o CMakeFiles/cmTC_ca285.dir/src.cxx.o -c ~/opencv-master/build/CMakeFiles/CMakeTmp/src.cxx
~/opencv-master/build/CMakeFiles/CMakeTmp/src.cxx:1:0: warning: ignoring #pragma   [-Wunknown-pragmas]
 #pragma
 
cc1plus: warning: unrecognized command line option ‘-Wno-inconsistent-missing-override’
Linking CXX executable cmTC_ca285
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_ca285.dir/link.txt --verbose=1
/usr/bin/g++     -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Winit-self -Wpointer-arith -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffast-math -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -Wno-shadow -Wno-unused -Wno-sign-compare -Wno-undef -Wno-missing-declarations -Wno-uninitialized -Wno-switch -Wno-parentheses -Wno-array-bounds -Wno-extra -Wno-deprecated-declarations -Wno-misleading-indentation -Wno-deprecated -Wno-suggest-override  -O3 -DNDEBUG    -Wl,--gc-sections  CMakeFiles/cmTC_ca285.dir/src.cxx.o  -o cmTC_ca285 
make[1]: Leaving directory '~/opencv-master/build/CMakeFiles/CMakeTmp'

===== END =====

Determining if the Q_WS_WIN exist failed with the following output:
Change Dir: ~/opencv-master/build/CMakeFiles/CMakeTmp

Run Build Command:&quot;/usr/bin/make&quot; &quot;cmTC_47b2b/fast&quot;
/usr/bin/make -f CMakeFiles/cmTC_47b2b.dir/build.make CMakeFiles/cmTC_47b2b.dir/build
make[1]: Entering directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_47b2b.dir/CheckSymbolExists.cxx.o
/usr/bin/g++   -I/usr/include/qt4  -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffast-math -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden  -O3 -DNDEBUG -fPIE   -std=c++11 -o CMakeFiles/cmTC_47b2b.dir/CheckSymbolExists.cxx.o -c ~/opencv-master/build/CMakeFiles/CMakeTmp/CheckSymbolExists.cxx
~/opencv-master/build/CMakeFiles/CMakeTmp/CheckSymbolExists.cxx: In function ‘int main(int, char**)’:
~/opencv-master/build/CMakeFiles/CMakeTmp/CheckSymbolExists.cxx:8:19: error: ‘Q_WS_WIN’ was not declared in this scope
   return ((int*)(&amp;Q_WS_WIN))[argc];
                   ^~~~~~~~
~/opencv-master/build/CMakeFiles/CMakeTmp/CheckSymbolExists.cxx:8:19: note: suggested alternative: ‘Q_WS_X11’
   return ((int*)(&amp;Q_WS_WIN))[argc];
                   ^~~~~~~~
                   Q_WS_X11
CMakeFiles/cmTC_47b2b.dir/build.make:65: recipe for target 'CMakeFiles/cmTC_47b2b.dir/CheckSymbolExists.cxx.o' failed
make[1]: *** [CMakeFiles/cmTC_47b2b.dir/CheckSymbolExists.cxx.o] Error 1
make[1]: Leaving directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_47b2b/fast' failed
make: *** [cmTC_47b2b/fast] Error 2

File ~/opencv-master/build/CMakeFiles/CMakeTmp/CheckSymbolExists.cxx:
/* */
#include &lt;QtCore/qglobal.h&gt;

int main(int argc, char** argv)
{
  (void)argv;
#ifndef Q_WS_WIN
  return ((int*)(&amp;Q_WS_WIN))[argc];
#else
  (void)argc;
  return 0;
#endif
}

Determining if the Q_WS_QWS exist failed with the following output:
Change Dir: ~/opencv-master/build/CMakeFiles/CMakeTmp

Run Build Command:&quot;/usr/bin/make&quot; &quot;cmTC_f1e16/fast&quot;
/usr/bin/make -f CMakeFiles/cmTC_f1e16.dir/build.make CMakeFiles/cmTC_f1e16.dir/build
make[1]: Entering directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_f1e16.dir/CheckSymbolExists.cxx.o
/usr/bin/g++   -I/usr/include/qt4  -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffast-math -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden  -O3 -DNDEBUG -fPIE   -std=c++11 -o CMakeFiles/cmTC_f1e16.dir/CheckSymbolExists.cxx.o -c ~/opencv-master/build/CMakeFiles/CMakeTmp/CheckSymbolExists.cxx
~/opencv-master/build/CMakeFiles/CMakeTmp/CheckSymbolExists.cxx: In function ‘int main(int, char**)’:
~/opencv-master/build/CMakeFiles/CMakeTmp/CheckSymbolExists.cxx:8:19: error: ‘Q_WS_QWS’ was not declared in this scope
   return ((int*)(&amp;Q_WS_QWS))[argc];
                   ^~~~~~~~
~/opencv-master/build/CMakeFiles/CMakeTmp/CheckSymbolExists.cxx:8:19: note: suggested alternative: ‘Q_WS_X11’
   return ((int*)(&amp;Q_WS_QWS))[argc];
                   ^~~~~~~~
                   Q_WS_X11
CMakeFiles/cmTC_f1e16.dir/build.make:65: recipe for target 'CMakeFiles/cmTC_f1e16.dir/CheckSymbolExists.cxx.o' failed
make[1]: *** [CMakeFiles/cmTC_f1e16.dir/CheckSymbolExists.cxx.o] Error 1
make[1]: Leaving directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_f1e16/fast' failed
make: *** [cmTC_f1e16/fast] Error 2

File ~/opencv-master/build/CMakeFiles/CMakeTmp/CheckSymbolExists.cxx:
/* */
#include &lt;QtCore/qglobal.h&gt;

int main(int argc, char** argv)
{
  (void)argv;
#ifndef Q_WS_QWS
  return ((int*)(&amp;Q_WS_QWS))[argc];
#else
  (void)argc;
  return 0;
#endif
}

Determining if the Q_WS_MAC exist failed with the following output:
Change Dir: ~/opencv-master/build/CMakeFiles/CMakeTmp

Run Build Command:&quot;/usr/bin/make&quot; &quot;cmTC_0328e/fast&quot;
/usr/bin/make -f CMakeFiles/cmTC_0328e.dir/build.make CMakeFiles/cmTC_0328e.dir/build
make[1]: Entering directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_0328e.dir/CheckSymbolExists.cxx.o
/usr/bin/g++   -I/usr/include/qt4  -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffast-math -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden  -O3 -DNDEBUG -fPIE   -std=c++11 -o CMakeFiles/cmTC_0328e.dir/CheckSymbolExists.cxx.o -c ~/opencv-master/build/CMakeFiles/CMakeTmp/CheckSymbolExists.cxx
~/opencv-master/build/CMakeFiles/CMakeTmp/CheckSymbolExists.cxx: In function ‘int main(int, char**)’:
~/opencv-master/build/CMakeFiles/CMakeTmp/CheckSymbolExists.cxx:8:19: error: ‘Q_WS_MAC’ was not declared in this scope
   return ((int*)(&amp;Q_WS_MAC))[argc];
                   ^~~~~~~~
~/opencv-master/build/CMakeFiles/CMakeTmp/CheckSymbolExists.cxx:8:19: note: suggested alternative: ‘Q_WS_X11’
   return ((int*)(&amp;Q_WS_MAC))[argc];
                   ^~~~~~~~
                   Q_WS_X11
CMakeFiles/cmTC_0328e.dir/build.make:65: recipe for target 'CMakeFiles/cmTC_0328e.dir/CheckSymbolExists.cxx.o' failed
make[1]: *** [CMakeFiles/cmTC_0328e.dir/CheckSymbolExists.cxx.o] Error 1
make[1]: Leaving directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_0328e/fast' failed
make: *** [cmTC_0328e/fast] Error 2

File ~/opencv-master/build/CMakeFiles/CMakeTmp/CheckSymbolExists.cxx:
/* */
#include &lt;QtCore/qglobal.h&gt;

int main(int argc, char** argv)
{
  (void)argv;
#ifndef Q_WS_MAC
  return ((int*)(&amp;Q_WS_MAC))[argc];
#else
  (void)argc;
  return 0;
#endif
}

Determining if the pthread_create exist failed with the following output:
Change Dir: ~/opencv-master/build/CMakeFiles/CMakeTmp

Run Build Command:&quot;/usr/bin/make&quot; &quot;cmTC_32b5a/fast&quot;
/usr/bin/make -f CMakeFiles/cmTC_32b5a.dir/build.make CMakeFiles/cmTC_32b5a.dir/build
make[1]: Entering directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_32b5a.dir/CheckSymbolExists.c.o
/usr/bin/gcc   -fPIC  -O3 -DNDEBUG -fPIE   -o CMakeFiles/cmTC_32b5a.dir/CheckSymbolExists.c.o   -c ~/opencv-master/build/CMakeFiles/CMakeTmp/CheckSymbolExists.c
Linking C executable cmTC_32b5a
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_32b5a.dir/link.txt --verbose=1
/usr/bin/gcc -fPIC  -O3 -DNDEBUG    -Wl,--gc-sections  CMakeFiles/cmTC_32b5a.dir/CheckSymbolExists.c.o  -o cmTC_32b5a 
CMakeFiles/cmTC_32b5a.dir/CheckSymbolExists.c.o: In function `main':
CheckSymbolExists.c:(.text.startup+0x3): undefined reference to `pthread_create'
collect2: error: ld returned 1 exit status
CMakeFiles/cmTC_32b5a.dir/build.make:97: recipe for target 'cmTC_32b5a' failed
make[1]: *** [cmTC_32b5a] Error 1
make[1]: Leaving directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_32b5a/fast' failed
make: *** [cmTC_32b5a/fast] Error 2

File ~/opencv-master/build/CMakeFiles/CMakeTmp/CheckSymbolExists.c:
/* */
#include &lt;pthread.h&gt;

int main(int argc, char** argv)
{
  (void)argv;
#ifndef pthread_create
  return ((int*)(&amp;pthread_create))[argc];
#else
  (void)argc;
  return 0;
#endif
}

Determining if the function pthread_create exists in the pthreads failed with the following output:
Change Dir: ~/opencv-master/build/CMakeFiles/CMakeTmp

Run Build Command:&quot;/usr/bin/make&quot; &quot;cmTC_31869/fast&quot;
/usr/bin/make -f CMakeFiles/cmTC_31869.dir/build.make CMakeFiles/cmTC_31869.dir/build
make[1]: Entering directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_31869.dir/CheckFunctionExists.c.o
/usr/bin/gcc   -fPIC -DCHECK_FUNCTION_EXISTS=pthread_create -O3 -DNDEBUG -fPIE   -o CMakeFiles/cmTC_31869.dir/CheckFunctionExists.c.o   -c /usr/share/cmake-3.10/Modules/CheckFunctionExists.c
Linking C executable cmTC_31869
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_31869.dir/link.txt --verbose=1
/usr/bin/gcc -fPIC -DCHECK_FUNCTION_EXISTS=pthread_create -O3 -DNDEBUG    -Wl,--gc-sections  CMakeFiles/cmTC_31869.dir/CheckFunctionExists.c.o  -o cmTC_31869 -lpthreads 
/usr/bin/ld: cannot find -lpthreads
collect2: error: ld returned 1 exit status
CMakeFiles/cmTC_31869.dir/build.make:97: recipe for target 'cmTC_31869' failed
make[1]: *** [cmTC_31869] Error 1
make[1]: Leaving directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_31869/fast' failed
make: *** [cmTC_31869/fast] Error 2


Determining if the include file sys/videoio.h exists failed with the following output:
Change Dir: ~/opencv-master/build/CMakeFiles/CMakeTmp

Run Build Command:&quot;/usr/bin/make&quot; &quot;cmTC_70175/fast&quot;
/usr/bin/make -f CMakeFiles/cmTC_70175.dir/build.make CMakeFiles/cmTC_70175.dir/build
make[1]: Entering directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_70175.dir/CheckIncludeFile.c.o
/usr/bin/gcc   -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffast-math -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden  -O3 -DNDEBUG -fPIE   -o CMakeFiles/cmTC_70175.dir/CheckIncludeFile.c.o   -c ~/opencv-master/build/CMakeFiles/CMakeTmp/CheckIncludeFile.c
~/opencv-master/build/CMakeFiles/CMakeTmp/CheckIncludeFile.c:1:10: fatal error: sys/videoio.h: No such file or directory
 #include &lt;sys/videoio.h&gt;
          ^~~~~~~~~~~~~~~
compilation terminated.
CMakeFiles/cmTC_70175.dir/build.make:65: recipe for target 'CMakeFiles/cmTC_70175.dir/CheckIncludeFile.c.o' failed
make[1]: *** [CMakeFiles/cmTC_70175.dir/CheckIncludeFile.c.o] Error 1
make[1]: Leaving directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_70175/fast' failed
make: *** [cmTC_70175/fast] Error 2


Build output check failed:
    Regex: 'unrecognized .*option'
    Output line: 'cc1plus: warning: unrecognized command line option ‘-Wno-unused-private-field’'
Compilation failed:
    source file: '~/opencv-master/build/CMakeFiles/CMakeTmp/src.cxx'
    check option: ' -Wno-unused-private-field'
===== BUILD LOG =====
Change Dir: ~/opencv-master/build/CMakeFiles/CMakeTmp

Run Build Command:&quot;/usr/bin/make&quot; &quot;cmTC_6bce1/fast&quot;
/usr/bin/make -f CMakeFiles/cmTC_6bce1.dir/build.make CMakeFiles/cmTC_6bce1.dir/build
make[1]: Entering directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_6bce1.dir/src.cxx.o
/usr/bin/g++    -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffast-math -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -Wno-unused-function -Wno-deprecated-declarations -Wno-overloaded-virtual  -O3 -DNDEBUG -fPIE   -Wno-unused-private-field -std=c++11 -o CMakeFiles/cmTC_6bce1.dir/src.cxx.o -c ~/opencv-master/build/CMakeFiles/CMakeTmp/src.cxx
~/opencv-master/build/CMakeFiles/CMakeTmp/src.cxx:1:0: warning: ignoring #pragma   [-Wunknown-pragmas]
 #pragma
 
cc1plus: warning: unrecognized command line option ‘-Wno-unused-private-field’
Linking CXX executable cmTC_6bce1
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_6bce1.dir/link.txt --verbose=1
/usr/bin/g++     -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffast-math -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -Wno-unused-function -Wno-deprecated-declarations -Wno-overloaded-virtual  -O3 -DNDEBUG    -Wl,--gc-sections  CMakeFiles/cmTC_6bce1.dir/src.cxx.o  -o cmTC_6bce1 
make[1]: Leaving directory '~/opencv-master/build/CMakeFiles/CMakeTmp'

===== END ====="><pre class="notranslate"><code class="notranslate">Build output check failed:
Regex: 'unrecognized .*option'
    Output line: 'cc1: warning: unrecognized command line option ‘-Wno-shorten-64-to-32’'
Compilation failed:
    source file: '~/opencv-master/build/CMakeFiles/CMakeTmp/src.c'
    check option: ' -Wno-shorten-64-to-32'
===== BUILD LOG =====
Change Dir: ~/opencv-master/build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_b6735/fast"
/usr/bin/make -f CMakeFiles/cmTC_b6735.dir/build.make CMakeFiles/cmTC_b6735.dir/build
make[1]: Entering directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_b6735.dir/src.c.o
/usr/bin/gcc   -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffast-math -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -Wno-unused-parameter -Wno-sign-compare  -O3 -DNDEBUG -fPIE   -Wno-shorten-64-to-32 -o CMakeFiles/cmTC_b6735.dir/src.c.o   -c ~/opencv-master/build/CMakeFiles/CMakeTmp/src.c
~/opencv-master/build/CMakeFiles/CMakeTmp/src.c:1:0: warning: ignoring #pragma   [-Wunknown-pragmas]
 #pragma
 
cc1: warning: unrecognized command line option ‘-Wno-shorten-64-to-32’
Linking C executable cmTC_b6735
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_b6735.dir/link.txt --verbose=1
/usr/bin/gcc    -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffast-math -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -Wno-unused-parameter -Wno-sign-compare  -O3 -DNDEBUG    -Wl,--gc-sections  CMakeFiles/cmTC_b6735.dir/src.c.o  -o cmTC_b6735 
make[1]: Leaving directory '~/opencv-master/build/CMakeFiles/CMakeTmp'

===== END =====

Determining if the include file io.h exists failed with the following output:
Change Dir: ~/opencv-master/build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_9bfa5/fast"
/usr/bin/make -f CMakeFiles/cmTC_9bfa5.dir/build.make CMakeFiles/cmTC_9bfa5.dir/build
make[1]: Entering directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_9bfa5.dir/CheckIncludeFile.c.o
/usr/bin/gcc   -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffast-math -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden  -O3 -DNDEBUG -fPIE   -o CMakeFiles/cmTC_9bfa5.dir/CheckIncludeFile.c.o   -c ~/opencv-master/build/CMakeFiles/CMakeTmp/CheckIncludeFile.c
~/opencv-master/build/CMakeFiles/CMakeTmp/CheckIncludeFile.c:1:10: fatal error: io.h: No such file or directory
 #include &lt;io.h&gt;
          ^~~~~~
compilation terminated.
CMakeFiles/cmTC_9bfa5.dir/build.make:65: recipe for target 'CMakeFiles/cmTC_9bfa5.dir/CheckIncludeFile.c.o' failed
make[1]: *** [CMakeFiles/cmTC_9bfa5.dir/CheckIncludeFile.c.o] Error 1
make[1]: Leaving directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_9bfa5/fast' failed
make: *** [cmTC_9bfa5/fast] Error 2


Determining size of INT8 failed with the following output:
Change Dir: ~/opencv-master/build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_c5d39/fast"
/usr/bin/make -f CMakeFiles/cmTC_c5d39.dir/build.make CMakeFiles/cmTC_c5d39.dir/build
make[1]: Entering directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_c5d39.dir/int8.c.o
/usr/bin/gcc   -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffast-math -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden  -O3 -DNDEBUG -fPIE   -o CMakeFiles/cmTC_c5d39.dir/int8.c.o   -c ~/opencv-master/build/CMakeFiles/CheckTypeSize/int8.c
~/opencv-master/build/CMakeFiles/CheckTypeSize/int8.c:23:22: error: ‘INT8’ undeclared here (not in a function); did you mean ‘INT8_C’?
 #define SIZE (sizeof(INT8))
                      ^
~/opencv-master/build/CMakeFiles/CheckTypeSize/int8.c:25:12: note: in expansion of macro ‘SIZE’
   ('0' + ((SIZE / 10000)%10)),
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CMakeFiles/cmTC_c5d39.dir/build.make:65: recipe for target 'CMakeFiles/cmTC_c5d39.dir/int8.c.o' failed
make[1]: *** [CMakeFiles/cmTC_c5d39.dir/int8.c.o] Error 1
make[1]: Leaving directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_c5d39/fast' failed
make: *** [cmTC_c5d39/fast] Error 2

~/opencv-master/build/CMakeFiles/CheckTypeSize/int8.c:
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Determining size of INT16 failed with the following output:
Change Dir: ~/opencv-master/build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_a4877/fast"
/usr/bin/make -f CMakeFiles/cmTC_a4877.dir/build.make CMakeFiles/cmTC_a4877.dir/build
make[1]: Entering directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_a4877.dir/int16.c.o
/usr/bin/gcc   -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffast-math -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden  -O3 -DNDEBUG -fPIE   -o CMakeFiles/cmTC_a4877.dir/int16.c.o   -c ~/opencv-master/build/CMakeFiles/CheckTypeSize/int16.c
~/opencv-master/build/CMakeFiles/CheckTypeSize/int16.c:23:22: error: ‘INT16’ undeclared here (not in a function); did you mean ‘INT16_C’?
 #define SIZE (sizeof(INT16))
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~/opencv-master/build/CMakeFiles/CheckTypeSize/int16.c:25:12: note: in expansion of macro ‘SIZE’
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CMakeFiles/cmTC_a4877.dir/build.make:65: recipe for target 'CMakeFiles/cmTC_a4877.dir/int16.c.o' failed
make[1]: *** [CMakeFiles/cmTC_a4877.dir/int16.c.o] Error 1
make[1]: Leaving directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_a4877/fast' failed
make: *** [cmTC_a4877/fast] Error 2

~/opencv-master/build/CMakeFiles/CheckTypeSize/int16.c:
#include &lt;sys/types.h&gt;
#include &lt;stdint.h&gt;
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Determining size of INT32 failed with the following output:
Change Dir: ~/opencv-master/build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_20741/fast"
/usr/bin/make -f CMakeFiles/cmTC_20741.dir/build.make CMakeFiles/cmTC_20741.dir/build
make[1]: Entering directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_20741.dir/int32.c.o
/usr/bin/gcc   -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffast-math -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden  -O3 -DNDEBUG -fPIE   -o CMakeFiles/cmTC_20741.dir/int32.c.o   -c ~/opencv-master/build/CMakeFiles/CheckTypeSize/int32.c
~/opencv-master/build/CMakeFiles/CheckTypeSize/int32.c:23:22: error: ‘INT32’ undeclared here (not in a function); did you mean ‘INT32_C’?
 #define SIZE (sizeof(INT32))
                      ^
~/opencv-master/build/CMakeFiles/CheckTypeSize/int32.c:25:12: note: in expansion of macro ‘SIZE’
   ('0' + ((SIZE / 10000)%10)),
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CMakeFiles/cmTC_20741.dir/build.make:65: recipe for target 'CMakeFiles/cmTC_20741.dir/int32.c.o' failed
make[1]: *** [CMakeFiles/cmTC_20741.dir/int32.c.o] Error 1
make[1]: Leaving directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_20741/fast' failed
make: *** [cmTC_20741/fast] Error 2

~/opencv-master/build/CMakeFiles/CheckTypeSize/int32.c:
#include &lt;sys/types.h&gt;
#include &lt;stdint.h&gt;
#include &lt;stddef.h&gt;


#undef KEY
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# define KEY '_','_','i','3','8','6'
#elif defined(__x86_64)
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# define KEY '_','_','p','p','c','_','_'
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#define SIZE (sizeof(INT32))
char info_size[] =  {'I', 'N', 'F', 'O', ':', 's','i','z','e','[',
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int main(argc, argv) int argc; char *argv[];
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Determining if the function setmode exists failed with the following output:
Change Dir: ~/opencv-master/build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_fd91a/fast"
/usr/bin/make -f CMakeFiles/cmTC_fd91a.dir/build.make CMakeFiles/cmTC_fd91a.dir/build
make[1]: Entering directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_fd91a.dir/CheckFunctionExists.c.o
/usr/bin/gcc   -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffast-math -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -DCHECK_FUNCTION_EXISTS=setmode -O3 -DNDEBUG -fPIE   -o CMakeFiles/cmTC_fd91a.dir/CheckFunctionExists.c.o   -c /usr/share/cmake-3.10/Modules/CheckFunctionExists.c
Linking C executable cmTC_fd91a
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_fd91a.dir/link.txt --verbose=1
/usr/bin/gcc    -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffast-math -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -DCHECK_FUNCTION_EXISTS=setmode -O3 -DNDEBUG    -Wl,--gc-sections  CMakeFiles/cmTC_fd91a.dir/CheckFunctionExists.c.o  -o cmTC_fd91a 
CMakeFiles/cmTC_fd91a.dir/CheckFunctionExists.c.o: In function `main':
CheckFunctionExists.c:(.text.startup.main+0xc): undefined reference to `setmode'
collect2: error: ld returned 1 exit status
CMakeFiles/cmTC_fd91a.dir/build.make:97: recipe for target 'cmTC_fd91a' failed
make[1]: *** [cmTC_fd91a] Error 1
make[1]: Leaving directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_fd91a/fast' failed
make: *** [cmTC_fd91a/fast] Error 2


Build output check failed:
    Regex: 'command line option .* is valid for .* but not for C\+\+'
    Output line: 'cc1plus: warning: command line option ‘-Wno-missing-prototypes’ is valid for C/ObjC but not for C++'
Compilation failed:
    source file: '~/opencv-master/build/CMakeFiles/CMakeTmp/src.cxx'
    check option: ' -Wno-missing-prototypes'
===== BUILD LOG =====
Change Dir: ~/opencv-master/build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_fc97d/fast"
/usr/bin/make -f CMakeFiles/cmTC_fc97d.dir/build.make CMakeFiles/cmTC_fc97d.dir/build
make[1]: Entering directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_fc97d.dir/src.cxx.o
/usr/bin/g++    -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffast-math -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -Wno-missing-declarations -Wno-unused-parameter  -O3 -DNDEBUG -fPIE   -Wno-missing-prototypes -std=c++11 -o CMakeFiles/cmTC_fc97d.dir/src.cxx.o -c ~/opencv-master/build/CMakeFiles/CMakeTmp/src.cxx
cc1plus: warning: command line option ‘-Wno-missing-prototypes’ is valid for C/ObjC but not for C++
~/opencv-master/build/CMakeFiles/CMakeTmp/src.cxx:1:0: warning: ignoring #pragma   [-Wunknown-pragmas]
 #pragma
 
Linking CXX executable cmTC_fc97d
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_fc97d.dir/link.txt --verbose=1
/usr/bin/g++     -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffast-math -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -Wno-missing-declarations -Wno-unused-parameter  -O3 -DNDEBUG    -Wl,--gc-sections  CMakeFiles/cmTC_fc97d.dir/src.cxx.o  -o cmTC_fc97d 
make[1]: Leaving directory '~/opencv-master/build/CMakeFiles/CMakeTmp'

===== END =====

Build output check failed:
    Regex: 'unrecognized .*option'
    Output line: 'cc1: warning: unrecognized command line option ‘-Wno-absolute-value’'
Compilation failed:
    source file: '~/opencv-master/build/CMakeFiles/CMakeTmp/src.c'
    check option: ' -Wno-absolute-value'
===== BUILD LOG =====
Change Dir: ~/opencv-master/build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_576bd/fast"
/usr/bin/make -f CMakeFiles/cmTC_576bd.dir/build.make CMakeFiles/cmTC_576bd.dir/build
make[1]: Entering directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_576bd.dir/src.c.o
/usr/bin/gcc   -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wundef -Winit-self -Wpointer-arith -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffast-math -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -Wno-implicit-function-declaration -Wno-uninitialized -Wno-missing-prototypes -Wno-unused-but-set-parameter -Wno-missing-declarations -Wno-unused -Wno-shadow -Wno-sign-compare -Wno-strict-overflow -Wno-pointer-compare  -O3 -DNDEBUG -fPIE   -Wno-absolute-value -o CMakeFiles/cmTC_576bd.dir/src.c.o   -c ~/opencv-master/build/CMakeFiles/CMakeTmp/src.c
~/opencv-master/build/CMakeFiles/CMakeTmp/src.c:1:0: warning: ignoring #pragma   [-Wunknown-pragmas]
 #pragma
 
cc1: warning: unrecognized command line option ‘-Wno-absolute-value’
Linking C executable cmTC_576bd
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_576bd.dir/link.txt --verbose=1
/usr/bin/gcc    -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wundef -Winit-self -Wpointer-arith -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffast-math -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -Wno-implicit-function-declaration -Wno-uninitialized -Wno-missing-prototypes -Wno-unused-but-set-parameter -Wno-missing-declarations -Wno-unused -Wno-shadow -Wno-sign-compare -Wno-strict-overflow -Wno-pointer-compare  -O3 -DNDEBUG    -Wl,--gc-sections  CMakeFiles/cmTC_576bd.dir/src.c.o  -o cmTC_576bd 
make[1]: Leaving directory '~/opencv-master/build/CMakeFiles/CMakeTmp'

===== END =====

Build output check failed:
    Regex: 'unrecognized .*option'
    Output line: 'cc1plus: warning: unrecognized command line option ‘-Wno-inconsistent-missing-override’'
Compilation failed:
    source file: '~/opencv-master/build/CMakeFiles/CMakeTmp/src.cxx'
    check option: ' -Wno-inconsistent-missing-override'
===== BUILD LOG =====
Change Dir: ~/opencv-master/build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_ca285/fast"
/usr/bin/make -f CMakeFiles/cmTC_ca285.dir/build.make CMakeFiles/cmTC_ca285.dir/build
make[1]: Entering directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_ca285.dir/src.cxx.o
/usr/bin/g++    -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Winit-self -Wpointer-arith -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffast-math -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -Wno-shadow -Wno-unused -Wno-sign-compare -Wno-undef -Wno-missing-declarations -Wno-uninitialized -Wno-switch -Wno-parentheses -Wno-array-bounds -Wno-extra -Wno-deprecated-declarations -Wno-misleading-indentation -Wno-deprecated -Wno-suggest-override  -O3 -DNDEBUG -fPIE   -Wno-inconsistent-missing-override -std=c++11 -o CMakeFiles/cmTC_ca285.dir/src.cxx.o -c ~/opencv-master/build/CMakeFiles/CMakeTmp/src.cxx
~/opencv-master/build/CMakeFiles/CMakeTmp/src.cxx:1:0: warning: ignoring #pragma   [-Wunknown-pragmas]
 #pragma
 
cc1plus: warning: unrecognized command line option ‘-Wno-inconsistent-missing-override’
Linking CXX executable cmTC_ca285
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_ca285.dir/link.txt --verbose=1
/usr/bin/g++     -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Winit-self -Wpointer-arith -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffast-math -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -Wno-shadow -Wno-unused -Wno-sign-compare -Wno-undef -Wno-missing-declarations -Wno-uninitialized -Wno-switch -Wno-parentheses -Wno-array-bounds -Wno-extra -Wno-deprecated-declarations -Wno-misleading-indentation -Wno-deprecated -Wno-suggest-override  -O3 -DNDEBUG    -Wl,--gc-sections  CMakeFiles/cmTC_ca285.dir/src.cxx.o  -o cmTC_ca285 
make[1]: Leaving directory '~/opencv-master/build/CMakeFiles/CMakeTmp'

===== END =====

Determining if the Q_WS_WIN exist failed with the following output:
Change Dir: ~/opencv-master/build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_47b2b/fast"
/usr/bin/make -f CMakeFiles/cmTC_47b2b.dir/build.make CMakeFiles/cmTC_47b2b.dir/build
make[1]: Entering directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_47b2b.dir/CheckSymbolExists.cxx.o
/usr/bin/g++   -I/usr/include/qt4  -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffast-math -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden  -O3 -DNDEBUG -fPIE   -std=c++11 -o CMakeFiles/cmTC_47b2b.dir/CheckSymbolExists.cxx.o -c ~/opencv-master/build/CMakeFiles/CMakeTmp/CheckSymbolExists.cxx
~/opencv-master/build/CMakeFiles/CMakeTmp/CheckSymbolExists.cxx: In function ‘int main(int, char**)’:
~/opencv-master/build/CMakeFiles/CMakeTmp/CheckSymbolExists.cxx:8:19: error: ‘Q_WS_WIN’ was not declared in this scope
   return ((int*)(&amp;Q_WS_WIN))[argc];
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~/opencv-master/build/CMakeFiles/CMakeTmp/CheckSymbolExists.cxx:8:19: note: suggested alternative: ‘Q_WS_X11’
   return ((int*)(&amp;Q_WS_WIN))[argc];
                   ^~~~~~~~
                   Q_WS_X11
CMakeFiles/cmTC_47b2b.dir/build.make:65: recipe for target 'CMakeFiles/cmTC_47b2b.dir/CheckSymbolExists.cxx.o' failed
make[1]: *** [CMakeFiles/cmTC_47b2b.dir/CheckSymbolExists.cxx.o] Error 1
make[1]: Leaving directory '~/opencv-master/build/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_47b2b/fast' failed
make: *** [cmTC_47b2b/fast] Error 2

File ~/opencv-master/build/CMakeFiles/CMakeTmp/CheckSymbolExists.cxx:
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===== END =====
</code></pre></div>
</details>
<h5 dir="auto">Steps to reproduce</h5>

<div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content=" cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D WITH_CUDA=ON -D WITH_CUBLAS=ON -D ENABLE_FAST_MATH=ON -D CUDA_FAST_MATH=ON -D ENABLE_NEON=ON -D WITH_LIBV4L=ON -D BUILD_TESTS=OFF -D BUILD_PERF_TESTS=OFF -D BUILD_EXAMPLES=ON -D WITH_QT=ON -D WITH_OPENGL=ON -D WITH_GSTREAMER=ON -D WITH_PROTOBUF=OFF -D INSTALL_PYTHON_EXAMPLES=ON -D WITH_GSTREAMER_0_10=OFF -D WITH_OPENCL=ON -D BUILD_opencv_python2=ON -D BUILD_opencv_python3=ON -D WITH_FFMPEG=ON -D WITH_CUFFT=ON -D WITH_V4L=ON -D WITH_V4L2=ON -D WITH_LIBV4L2=ON -D WITH_LIBV4L=ON -D OPENCV_ENABLE_NONFREE=ON -D CMAKE_CXX_COMPILER=g++ -D CMAKE_C_COMPILER=gcc -D OPENCV_EXTRA_MODULES_PATH=../opencv_contrib-master/modules .."><pre class="notranslate"> cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D WITH_CUDA=ON -D WITH_CUBLAS=ON -D ENABLE_FAST_MATH=ON -D CUDA_FAST_MATH=ON -D ENABLE_NEON=ON -D WITH_LIBV4L=ON -D BUILD_TESTS=OFF -D BUILD_PERF_TESTS=OFF -D BUILD_EXAMPLES=ON -D WITH_QT=ON -D WITH_OPENGL=ON -D WITH_GSTREAMER=ON -D WITH_PROTOBUF=OFF -D INSTALL_PYTHON_EXAMPLES=ON -D WITH_GSTREAMER_0_10=OFF -D WITH_OPENCL=ON -D BUILD_opencv_python2=ON -D BUILD_opencv_python3=ON -D WITH_FFMPEG=ON -D WITH_CUFFT=ON -D WITH_V4L=ON -D WITH_V4L2=ON -D WITH_LIBV4L2=ON -D WITH_LIBV4L=ON -D OPENCV_ENABLE_NONFREE=ON -D CMAKE_CXX_COMPILER=g++ -D CMAKE_C_COMPILER=gcc -D OPENCV_EXTRA_MODULES_PATH=../opencv_contrib-master/modules ..</pre></div>
<h5 dir="auto">System information (version)</h5>
<ul dir="auto">
<li>OpenCV =&gt; 4.0.1</li>
<li>Operating System / Platform =&gt; Linux 64-bit (Ubuntu 18.04)</li>
<li>Compiler =&gt; Clang 7.0.1</li>
</ul>
<h5 dir="auto">Detailed description</h5>
<p dir="auto">The following test in <code class="notranslate">imgcodecs</code> is failing:</p>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="[ RUN      ] imgcodecs/Imgcodecs_Image.read_write/3, where GetParam() = &quot;jp2&quot;
warning: empty layer generated
opencv/modules/imgcodecs/test/test_read_write.cpp:75: Failure
Expected: (psnr) &gt; (thresDbell), actual: 13.2068 vs 32
warning: empty layer generated
opencv/modules/imgcodecs/test/test_read_write.cpp:93: Failure
Expected: (psnr) &gt; (thresDbell), actual: 13.2068 vs 32
[  FAILED  ] imgcodecs/Imgcodecs_Image.read_write/3, where GetParam() = &quot;jp2&quot; (303 ms)"><pre class="notranslate"><code class="notranslate">[ RUN      ] imgcodecs/Imgcodecs_Image.read_write/3, where GetParam() = "jp2"
warning: empty layer generated
opencv/modules/imgcodecs/test/test_read_write.cpp:75: Failure
Expected: (psnr) &gt; (thresDbell), actual: 13.2068 vs 32
warning: empty layer generated
opencv/modules/imgcodecs/test/test_read_write.cpp:93: Failure
Expected: (psnr) &gt; (thresDbell), actual: 13.2068 vs 32
[  FAILED  ] imgcodecs/Imgcodecs_Image.read_write/3, where GetParam() = "jp2" (303 ms)
</code></pre></div>
<p dir="auto">Other unit tests in that library pass just fine, and there don't seem to be any problems compiling opencv or other tests failing in other modules.</p>
<p dir="auto">The particular test does <em>not</em> fail when compiling with GCC 8.2.</p>
<h5 dir="auto">Steps to reproduce</h5>
<ul dir="auto">
<li>Tested on both 4.0.1 and 3.4.5, same behavior</li>
<li>Relevant cmake configuration:</li>
</ul>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="--   C/C++:
--     Built as dynamic libs?:      YES
--     C++ Compiler:                /usr/local/bin/clang++  (ver 7.0.1)
--   Media I/O: 
--     TIFF:                        build (ver 42 - 4.0.9)
--     JPEG 2000:                   build (ver 1.900.1)
--     OpenEXR:                     build (ver 1.7.1)"><pre class="notranslate"><code class="notranslate">--   C/C++:
--     Built as dynamic libs?:      YES
--     C++ Compiler:                /usr/local/bin/clang++  (ver 7.0.1)
--   Media I/O: 
--     TIFF:                        build (ver 42 - 4.0.9)
--     JPEG 2000:                   build (ver 1.900.1)
--     OpenEXR:                     build (ver 1.7.1)
</code></pre></div>