j0 , j1, jn was not declared in this scope, edit math.h will fix, but please ……

[garfeng]

System information (version)

• OpenCV => 4.5.3
• Operating System / Platform => Windows 64 Bit
• Compiler => MinGW64-GCC

Detailed description

[ 90%] Building CXX object modules/sfm/src/libmv/libmv/multiview/CMakeFiles/multiview.dir/fundamental.cc.obj
In file included from F:/msys64/mingw64/include/ceres/internal/autodiff.h:153,
                 from F:/msys64/mingw64/include/ceres/autodiff_cost_function.h:130,
                 from F:/msys64/mingw64/include/ceres/ceres.h:37,
                 from F:/opencv/opencv_contrib-4.5.3/modules/sfm/src/libmv_light/libmv/multiview/fundamental.cc:24:
F:/msys64/mingw64/include/ceres/jet.h: In function 'double ceres::BesselJ0(double)':
F:/msys64/mingw64/include/ceres/jet.h:603:10: error: 'j0' was not declared in this scope; did you mean 'V0'?
  603 |   return j0(x);
      |          ^~
      |          V0
F:/msys64/mingw64/include/ceres/jet.h: In function 'double ceres::BesselJ1(double)':
F:/msys64/mingw64/include/ceres/jet.h:610:10: error: 'j1' was not declared in this scope; did you mean 'V1'?
  610 |   return j1(x);
      |          ^~
      |          V1
F:/msys64/mingw64/include/ceres/jet.h: In function 'double ceres::BesselJn(int, double)':
F:/msys64/mingw64/include/ceres/jet.h:617:10: error: 'jn' was not declared in this scope; did you mean 'n'?
  617 |   return jn(n, x);
      |          ^~
      |          n
make[2]: *** [modules/sfm/src/libmv/libmv/multiview/CMakeFiles/multiview.dir/build.make:107：modules/sfm/src/libmv/libmv/multiview/CMakeFiles/multiview.dir/fundamental.cc.obj] 错误 1
make[1]: *** [CMakeFiles/Makefile2:5281：modules/sfm/src/libmv/libmv/multiview/CMakeFiles/multiview.dir/all] 错误 2

Steps to reproduce

cmake /f/opencv/opencv-4.5.3 -G "Unix Makefiles" -B/f/opencv/build_x64 -DENABLE_CXX11=ON -DOPENCV_EXTRA_MODULES_PATH=/f/opencv/opencv_contrib-4.5.3/modules -DBUILD_SHARED_LIBS=ON -DWITH_IPP=OFF -DWITH_MSMF=OFF -DBUILD_EXAMPLES=OFF -DBUILD_TESTS=OFF -DBUILD_PERF_TESTS=OFF -DBUILD_opencv_java=OFF -DBUILD_opencv_python=OFF -DBUILD_opencv_python2=OFF -DBUILD_opencv_python3=OFF -DBUILD_DOCS=OFF -DENABLE_PRECOMPILED_HEADERS=OFF -DBUILD_opencv_saliency=OFF -DBUILD_opencv_wechat_qrcode=OFF -DCPU_DISPATCH= -DOPENCV_GENERATE_PKGCONFIG=ON -DWITH_OPENCL_D3D11_NV=OFF -DOPENCV_ALLOCATOR_STATS_COUNTER_TYPE=int64_t -U__STRICT_ANSI__ -Wno-dev

cd /f/opencv/build_x64
make

I edit the F:\msys64\mingw64\x86_64-w64-mingw32\include\math.h by adding #undef __STRICT_ANSI__ to the top of the file, then the error disappears.

// math.h

#ifndef _MATH_H_
#define _MATH_H_

#undef __STRICT_ANSI__  // <= I add this line.

#ifdef __GNUC__
#pragma GCC system_header
#endif /* __GNUC__ */

#include <crtdefs.h>

struct _exception;

#pragma pack(push,_CRT_PACKING)

#define	_DOMAIN		1	/* domain error in argument */
#define	_SING		2	/* singularity */
#define	_OVERFLOW	3	/* range overflow */
#define	_UNDERFLOW	4	/* range underflow */
#define	_TLOSS		5	/* total loss of precision */
#define	_PLOSS		6	/* partial loss of precision */

Please refer to this question : https://stackoverflow.com/questions/42231558/mingw-c-wont-compile-j0-funciton

Please fix it or tell me whether should I report the issue to Mingw64/Msys2

Issue submission checklist

• I report the issue, it's not a question
• I checked the problem with documentation, FAQ, open issues,
  forum.opencv.org, Stack Overflow, etc and have not found solution
• I updated to latest OpenCV version and the issue is still there
• There is reproducer code and related data files: videos, images, onnx, etc

[berak]

which mingw version is it ?
8.1.0 here can handle c++14 "out-of-the-box", so you might not need the -DENABLE_CXX11=ON flag
i don' have ceres here, but a small example:

#include <math.h>
int main(int argc, char* argv[])
{
	j0(13);
	return 0;
}

g++ my.cpp // compiles fine
g++ -std=c++11 my.cpp // error: 'j0' was not declared in this scope

so, can you try, if removing the flag from the cmake cmdline helps ?

[garfeng]

Hello, thank you for your help.

I use the toolchain installed in Msys2.

mingw32 mingw-w64-i686-arm-none-eabi-gcc 10.1.0-2
mingw32 mingw-w64-i686-avr-gcc 8.4.0-4
mingw32 mingw-w64-i686-gcc 10.3.0-5 [installed]
mingw32 mingw-w64-i686-gcc-ada 10.3.0-5
mingw32 mingw-w64-i686-gcc-fortran 10.3.0-5
mingw32 mingw-w64-i686-gcc-libgfortran 10.3.0-5 [installed]
mingw32 mingw-w64-i686-gcc-libs 10.3.0-5 [installed]
mingw32 mingw-w64-i686-gcc-objc 10.3.0-5
mingw32 mingw-w64-i686-libgccjit 10.3.0-5
mingw32 mingw-w64-i686-riscv64-unknown-elf-gcc 10.1.0-2
mingw64 mingw-w64-x86_64-arm-none-eabi-gcc 10.1.0-2
mingw64 mingw-w64-x86_64-avr-gcc 8.4.0-4
mingw64 mingw-w64-x86_64-gcc 10.3.0-5 [installed]
mingw64 mingw-w64-x86_64-gcc-ada 10.3.0-5 [installed]
mingw64 mingw-w64-x86_64-gcc-fortran 10.3.0-5 [installed]
mingw64 mingw-w64-x86_64-gcc-libgfortran 10.3.0-5 [installed]
mingw64 mingw-w64-x86_64-gcc-libs 10.3.0-5 [installed]
mingw64 mingw-w64-x86_64-gcc-objc 10.3.0-5 [installed]
mingw64 mingw-w64-x86_64-libgccjit 10.3.0-5 [installed]
mingw64 mingw-w64-x86_64-riscv64-unknown-elf-gcc 10.1.0-2
ucrt64 mingw-w64-ucrt-x86_64-gcc 10.3.0-5
ucrt64 mingw-w64-ucrt-x86_64-gcc-fortran 10.3.0-5
ucrt64 mingw-w64-ucrt-x86_64-gcc-libgfortran 10.3.0-5
ucrt64 mingw-w64-ucrt-x86_64-gcc-libs 10.3.0-5
ucrt64 mingw-w64-ucrt-x86_64-gcc-objc 10.3.0-5
ucrt64 mingw-w64-ucrt-x86_64-libgccjit 10.3.0-5
msys gcc 10.2.0-1
msys gcc-fortran 10.2.0-1
msys gcc-libs 10.2.0-1 [installed]
msys mingw-w64-cross-gcc 10.2.0-1

8.1.0 here can handle c++14 "out-of-the-box", so you might not need the -DENABLE_CXX11=ON flag

When I remove the -DENABLE_CXX11=ON, the error still appears.

[alalek]

Use make VERBOSE=1 to see actual compiler's command line of failed step (check for -std= option)

[superheasy]

I have the same problem。
Windows 10 x64 ，Msys2 ，g++ 10.3.0，opencv4.5.3 .

I Use make VERBOSE=1：

`

$ mingw32-make.exe VERBOSE=1
C:\msys64\mingw64\bin\cmake.exe -SD:\opencv\opencv -BD:\opencv\opencv4_mingw64build --check-build-system CMakeFiles\Makefile.cmake 0
C:\msys64\mingw64\bin\cmake.exe -E cmake_progress_start D:\opencv\opencv4_mingw64build\CMakeFiles D:\opencv\opencv4_mingw64build\CMakeFiles\progress.marks
C:/msys64/mingw64/bin/mingw32-make.exe -f CMakeFiles\Makefile2 all
mingw32-make[1]: Entering directory 'D:/opencv/opencv4_mingw64build'
C:/msys64/mingw64/bin/mingw32-make.exe -f CMakeFiles\gen-pkgconfig.dir\build.make CMakeFiles/gen-pkgconfig.dir/depend
mingw32-make[2]: Entering directory 'D:/opencv/opencv4_mingw64build'
C:\msys64\mingw64\bin\cmake.exe -E cmake_depends "MinGW Makefiles" D:\opencv\opencv D:\opencv\opencv D:\opencv\opencv4_mingw64build D:\opencv\opencv4_mingw64build D:\opencv\opencv4_mingw64build\CMakeFiles\gen-pkgconfig.dir\DependInfo.cma
mingw32-make[2]: Leaving directory 'D:/opencv/opencv4_mingw64build'
C:/msys64/mingw64/bin/mingw32-make.exe -f CMakeFiles\gen-pkgconfig.dir\build.make CMakeFiles/gen-pkgconfig.dir/build
mingw32-make[2]: Entering directory 'D:/opencv/opencv4_mingw64build'
mingw32-make[2]: Nothing to be done for 'CMakeFiles/gen-pkgconfig.dir/build'.
mingw32-make[2]: Leaving directory 'D:/opencv/opencv4_mingw64build'
[ 0%] Built target gen-pkgconfig

`

……………………………………

……………………………………
`

Consolidate compiler generated dependencies of target multiview
mingw32-make[2]: Leaving directory 'D:/opencv/opencv4_mingw64build'
C:/msys64/mingw64/bin/mingw32-make.exe -f modules\sfm\src\libmv\libmv\multiview\CMakeFiles\multiview.dir\build.make modules/sfm/src/libmv/libmv/multiview/CMakeFiles/multiview.dir/build
mingw32-make[2]: Entering directory 'D:/opencv/opencv4_mingw64build'
[ 88%] Building CXX object modules/sfm/src/libmv/libmv/multiview/CMakeFiles/multiview.dir/fundamental.cc.obj
cd /d D:\opencv\opencv4_mingw64build\modules\sfm\src\libmv\libmv\multiview && C:/msys64/mingw64/bin/ccache.exe C:\msys64\mingw64\bin\g++.exe -DCERES_EXPORT_INTERNAL_SYMBOLS -DCERES_FOUND=1 -DGFLAGS_IS_A_DLL=1 -DGLOG_NO_ABBREVIATED_SEVERILD=1 -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS @CMakeFiles/multiview.dir/includes_CXX.rsp -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Weno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -fvisibilityeclarations -Wno-unused-but-set-variable -Wno-unused-parameter -Wno-unused-function -Wno-suggest-override -Wno-suggest-override -Wno-class-memaccess -Wno-deprecated-copy -O3 -DNDEBUG -DNDEBUG -std=c++14 -MD -MT modules/sfm/src/libmv/libw.dir\fundamental.cc.obj.d -o CMakeFiles\multiview.dir\fundamental.cc.obj -c D:\opencv\opencv_contrib\modules\sfm\src\libmv_light\libmv\multiview\fundamental.cc
In file included from C:/msys64/mingw64/include/ceres/internal/autodiff.h:153,
from C:/msys64/mingw64/include/ceres/autodiff_cost_function.h:130,
from C:/msys64/mingw64/include/ceres/ceres.h:37,
from D:\opencv\opencv_contrib\modules\sfm\src\libmv_light\libmv\multiview\fundamental.cc:24:
C:/msys64/mingw64/include/ceres/jet.h: In function 'double ceres::BesselJ0(double)':
C:/msys64/mingw64/include/ceres/jet.h:603:10: error: 'j0' was not declared in this scope; did you mean 'V0'?
603 | return j0(x);
| ^~
| V0
C:/msys64/mingw64/include/ceres/jet.h: In function 'double ceres::BesselJ1(double)':
C:/msys64/mingw64/include/ceres/jet.h:610:10: error: 'j1' was not declared in this scope; did you mean 'V1'?
610 | return j1(x);
| ^~
| V1
C:/msys64/mingw64/include/ceres/jet.h: In function 'double ceres::BesselJn(int, double)':
C:/msys64/mingw64/include/ceres/jet.h:617:10: error: 'jn' was not declared in this scope; did you mean 'n'?
617 | return jn(n, x);
| ^~
| n
mingw32-make[2]: *** [modules\sfm\src\libmv\libmv\multiview\CMakeFiles\multiview.dir\build.make:106: modules/sfm/src/libmv/libmv/multiview/CMakeFiles/multiview.dir/fundamental.cc.obj] Error 1
mingw32-make[2]: Leaving directory 'D:/opencv/opencv4_mingw64build'
mingw32-make[1]: *** [CMakeFiles\Makefile2:8317: modules/sfm/src/libmv/libmv/multiview/CMakeFiles/multiview.dir/all] Error 2
mingw32-make[1]: Leaving directory 'D:/opencv/opencv4_mingw64build'
mingw32-make: *** [Makefile:165: all] Error 2
`

I have test g++：
this is Ok
$ g++ -std=gnu++14 hello.cpp
，but error when
`
$ g++ -std=c++14 hello.cpp
hello.cpp: In function 'int main(int, char**)':
hello.cpp:4:2: error: 'j0' was not declared in this scope
4 | j0(13);
| ^~

`

p.s. 
when BUILD_opencv_sfm is off ,I can build successful .

[alalek]

Could you try these options:

• cmake ... -DOPENCV_EXTRA_CXX_FLAGS=-std=gnu++14
• or cmake -DCMAKE_CXX_EXTENSIONS=ON

[superheasy]

I make all both
cmake ... -DOPENCV_EXTRA_CXX_FLAGS=-std=gnu++14 and cmake -DCMAKE_CXX_EXTENSIONS=ON

·

Consolidate compiler generated dependencies of target multiview
[ 91%] Building CXX object modules/sfm/src/libmv/libmv/multiview/CMakeFiles/multiview.dir/robust_estimation.cc.obj
In file included from D:\opencv\opencv_contrib\modules\sfm\src\libmv_light\libmv\multiview\robust_estimation.cc:26:
D:/opencv/opencv_contrib/modules/sfm/src/libmv_light/libmv/multiview/robust_estimation.h:57:8: error: 'uint' does not name a type; did you mean 'rint'?
57 | static uint IterationsRequired(int min_samples,
| ^~~~
| rint
D:/opencv/opencv_contrib/modules/sfm/src/libmv_light/libmv/multiview/robust_estimation.h: In function 'typename Kernel::Model libmv::Estimate(const Kernel&, const Scorer&, libmv::vector, double, double)':
D:/opencv/opencv_contrib/modules/sfm/src/libmv_light/libmv/multiview/robust_estimation.h:138:26: error: there are no arguments to 'IterationsRequired' that depend on a template parameter, so a declaration of 'IterationsRequired' must be available [-fpermissive]
138 | max_iterations = IterationsRequired(min_samples,
| ^~~~~~~~~~~~~~~~~~
D:/opencv/opencv_contrib/modules/sfm/src/libmv_light/libmv/multiview/robust_estimation.h:138:26: note: (if you use '-fpermissive', G++ will accept your code, but allowing the use of an undeclared name is deprecated)
mingw32-make[2]: *** [modules\sfm\src\libmv\libmv\multiview\CMakeFiles\multiview.dir\build.make:196: modules/sfm/src/libmv/libmv/multiview/CMakeFiles/multiview.dir/robust_estimation.cc.obj] Error 1
mingw32-make[1]: *** [CMakeFiles\Makefile2:8224: modules/sfm/src/libmv/libmv/multiview/CMakeFiles/multiview.dir/all] Error 2

·~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
verbose=1

`
[ 92%] Building CXX object modules/stitching/CMakeFiles/opencv_stitching.dir/src/seam_finders.cpp.obj
cd /d D:\opencv\opencv4_mingw64build\modules\stitching && C:/msys64/mingw64/bin/ccache.exe C:\msys64\mingw64\bin\g++.exe -DCVAPI_EXPORTS -DVK_NO_PROTOTYPES -D_USE_MATH_DEFINES -D_WIN32_WINNT=0x0601 -D__OPENCV_BUILD=1 -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS @CMakeFiles/opencv_stitching.dir/includes_CXX.rsp -std=gnu++14 -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 -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -fopenmp -O3 -DNDEBUG -DNDEBUG -std=gnu++11 -MD -MT modules/stitching/CMakeFiles/opencv_stitching.dir/src/seam_finders.cpp.obj -MF CMakeFiles\opencv_stitching.dir\src\seam_finders.cpp.obj.d -o CMakeFiles\opencv_stitching.dir\src\seam_finders.cpp.obj -c D:\opencv\opencv\modules\stitching\src\seam_finders.cpp
In file included from D:\opencv\opencv_contrib\modules\sfm\src\libmv_light\libmv\multiview\robust_resection.cc:22:
D:/opencv/opencv_contrib/modules/sfm/src/libmv_light/libmv/multiview/robust_estimation.h:57:8: error: 'uint' does not name a type; did you mean 'rint'?
57 | static uint IterationsRequired(int min_samples,
| ^~~~
| rint
D:/opencv/opencv_contrib/modules/sfm/src/libmv_light/libmv/multiview/robust_estimation.h: In function 'typename Kernel::Model libmv::Estimate(const Kernel&, const Scorer&, libmv::vector, double, double)':
D:/opencv/opencv_contrib/modules/sfm/src/libmv_light/libmv/multiview/robust_estimation.h:138:26: error: there are no arguments to 'IterationsRequired' that depend on a template parameter, so a declaration of 'IterationsRequired' must be available [-fpermissive]
138 | max_iterations = IterationsRequired(min_samples,
| ^~~~~~~~~~~~~~~~~~
D:/opencv/opencv_contrib/modules/sfm/src/libmv_light/libmv/multiview/robust_estimation.h:138:26: note: (if you use '-fpermissive', G++ will accept your code, but allowing the use of an undeclared name is deprecated)
D:/opencv/opencv_contrib/modules/sfm/src/libmv_light/libmv/multiview/robust_estimation.h: In instantiation of 'typename Kernel::Model libmv::Estimate(const Kernel&, const Scorer&, libmv::vector, double, double) [with Kernel = libmv::resection::kernel::Kernel; Scorer = libmv::MLEScorerlibmv::resection::kernel::Kernel; typename Kernel::Model = Eigen::Matrix<double, 3, 4>]':
D:\opencv\opencv_contrib\modules\sfm\src\libmv_light\libmv\multiview\robust_resection.cc:41:50: required from here
D:/opencv/opencv_contrib/modules/sfm/src/libmv_light/libmv/multiview/robust_estimation.h:138:44: error: 'IterationsRequired' was not declared in this scope
138 | max_iterations = IterationsRequired(min_samples,
| ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
139 | outliers_probability,
| ~~~~~~~~~~~~~~~~~~~~~
140 | best_inlier_ratio);
| ~~~~~~~~~~~~~~~~~~
mingw32-make[2]: *** [modules\sfm\src\libmv\libmv\multiview\CMakeFiles\multiview.dir\build.make:226: modules/sfm/src/libmv/libmv/multiview/CMakeFiles/multiview.dir/robust_resection.cc.obj] Error 1
mingw32-make[2]: Leaving directory 'D:/opencv/opencv4_mingw64build'
mingw32-make[1]: *** [CMakeFiles\Makefile2:8224: modules/sfm/src/libmv/libmv/multiview/CMakeFiles/multiview.dir/all] Error 2
mingw32-make[1]: *** Waiting for unfinished jobs....

`

[alalek]

Now there are several -std options. That isn't good.

g++.exe -std=gnu++14 ... -std=gnu++11 ...

---

Please try this only:

cmake ... -DCMAKE_CXX_EXTENSIONS=ON -DCMAKE_CXX_STANDARD=14

(please check installed Ceres version and its prerequisites about required C++ mode)

[garfeng]

Now there are several -std options. That isn't good.

g++.exe -std=gnu++14 ... -std=gnu++11 ...

Please try this only:

cmake ... -DCMAKE_CXX_EXTENSIONS=ON -DCMAKE_CXX_STANDARD=14

(please check installed Ceres version and its prerequisites about required C++ mode)

@alalek thank you for your answer.

cmake ... -DCMAKE_CXX_EXTENSIONS=ON -DCMAKE_CXX_STANDARD=14

works!!!