C++ compiler produced errors.

how can i solve this problem?

i install__MATLAB Support for MinGW-w64 C/C++ Compiler

i use R2021a

[Darshan Ramakant Bhat]

You can try

mex -setup

to validate that you are using the correct compiler.

If you are trying raspberry pi with MATLAB Coder you can refer below support package :

https://www.mathworks.com/hardware-support/raspberry-pi-matlab-coder.html

[Prasanth Sunkara]

Can you please share the "deploy" command output generated in the MATLAB cmd window? It would have some hints on why that error happened.

[chan yeoung woo]

Error executing command "touch -c /home/pi/MATLAB_ws/R2021a/C/Users/CODLab-DHKim/Documents/MATLAB/Examples/R2021a/raspberrypiio/ClassifyImageOnRaspberryPiViaSSHWithResNet50AndOpenCVExample/codegen/exe/raspi_fileRead_resnet/*.*;make -f raspi_fileRead_resnet_rtw.mk all MATLAB_WORKSPACE="/home/pi/MATLAB_ws/R2021a" -C /home/pi/MATLAB_ws/R2021a/C/Users/CODLab-DHKim/Documents/MATLAB/Examples/R2021a/raspberrypiio/ClassifyImageOnRaspberryPiViaSSHWithResNet50AndOpenCVExample/codegen/exe/raspi_fileRead_resnet". Details:

STDERR: /home/pi/MATLAB_ws/R2021a/C/Users/CODLab-DHKim/Documents/MATLAB/Examples/R2021a/raspberrypiio/ClassifyImageOnRaspberryPiViaSSHWithResNet50AndOpenCVExample/codegen/exe/raspi_fileRead_resnet/main.cpp:84:5: error: conflicting declaration of C function ‘int main(int, const char* const*)’

int main(int argc, const char * const argv[])

^~~~

In file included from /home/pi/MATLAB_ws/R2021a/C/Users/CODLab-DHKim/Documents/MATLAB/Examples/R2021a/raspberrypiio/ClassifyImageOnRaspberryPiViaSSHWithResNet50AndOpenCVExample/codegen/exe/raspi_fileRead_resnet/main.cpp:38:

/home/pi/MATLAB_ws/R2021a/C/Users/CODLab-DHKim/Documents/MATLAB/Examples/R2021a/raspberrypiio/ClassifyImageOnRaspberryPiViaSSHWithResNet50AndOpenCVExample/codegen/exe/raspi_fileRead_resnet/main.h:48:12: note: previous declaration ‘int main(int, char**)’

extern int main(int argc, char **argv);

^~~~

make: *** [raspi_fileRead_resnet_rtw.mk:488: main.cpp.o] Error 1

Answer 1

[Lokesh]

Hi chan,

As per my understanding, you are encountering an error due to mismatch in the declaration of 'main' function between 'main.cpp' file and 'main.h' header file.

To resolve this issue, you need to ensure that the declaration of 'main' function in 'main.h' file matches its definition in 'main.cpp' file, particularly regarding the 'const' qualifier for 'argv' parameter.The original declaration in 'main.h' is 'extern int main(int argc, char **argv);' which conflicts with the definition in 'main.cpp' that uses 'const char * const argv[]'.

Please refer to the following steps to resolve the issue:

• Open the 'main.h' file and locate the declaration of 'main' function
• Modify the declaration to "extern int main(int argc, const char * const argv[]);" . Correcting the declaration in 'main.h' to 'extern int main(int argc, const char * const argv[]);' ensures that the the declaration matches its definition.
• Save the changes and recompile to check if the issue has been resolved.

I hope this helps you in resolving the issue.