fatal error C1083: Cannot open source file: '..\..\..\..\Program Files\MATL​AB\R2017a\​rtw\c\src\​common\rt_​main.c': No such file or directory [Using Code Generation in Simulink]

I am trying to build my Simulink model using Visual Studio 2012 c++ compiler which is building just fine. However, included in the project are two .c files, namely:

rt_main.c

rt_logging.c

And when I try to build the model in Visual Studio 2012, it gives me the error that is in the title. In the directory '..\..\..\..\Program Files\MATLAB\R2017a\rtw\c\src\common\rt_main.c': I cannot find a file named rt_main.c, but I can find one named rt_main.cpp. Same for the rt_logging.c file. I've tried changing names either places without luck.

1) Why are .c files included in the project, when I have specificed in the Code Generation Options that the system target file is grt.tlc [Create Visual C/C++ Solution File for Simulink Coder] with c++ language?

2) How can I make Simulink build using the rt_main.cpp file?

If I uncheck the box "Generate Code Only" in Configuration Parameters -> Code Generation -> Build Process, it gives me the errors:

1>------ Build started: Project: SimulinkModelDLL, Configuration: Debug x64 ------
1>Build started 15-03-2021 12:01:44.
1>InitializeBuildStatus:
1>  Creating "x64\Debug\SimulinkModelDLL.unsuccessfulbuild" because "AlwaysCreate" was specified.
1>ClCompile:
1>  rt_main.c
1>c1 : fatal error C1083: Cannot open source file: '..\..\..\..\Program Files\MATLAB\R2017a\rtw\c\src\common\rt_main.c': No such file or directory
1>  rt_logging.c
1>c1 : fatal error C1083: Cannot open source file: 'rt_logging.c': No such file or directory
1>  Generating Code...
1>
1>Build FAILED.
1>
1>Time Elapsed 00:00:00.12
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

[Fangjun Jiang]

You mean the building is fine in Simulink but not in VC 2012 directly?

[Rasmus Visgaard]

Correct. It builds just fine in Simulink, but if I attempt to build it in VS2012, it gives me the said error.

[Fangjun Jiang]

Okay, I think you can "generate code" fine in Simulink but not "build", because you had those "build" errors in MATLAB Command window.

It surprised me that I found only rt_main.c in R17b and R18b folders but not rt_main.cpp file.

Where did you find the file and can you open it to look at the "abstract" at the begining of the file?

[Rasmus Visgaard]

Funny, because it's the other way around here. I can find the rt_main.cpp but not the rt_main.c. The folder I found it in is the same folder that VS is looking for the rt_main.c :

C:\Program Files\MATLAB\R2017a\rtw\c\src\common

Abstract:

/* 
 * Copyright 2012-2015 The MathWorks, Inc.
 *
 * File: rt_main.c
 *
 * Abstract:
 *
 *   A real-time main that runs generated Simulink Coder code under most 
 *   operating systems.  Based on the definition of MULTITASKING, a single-task 
 *   or multitask step function is employed.
 *
 *   This file is a useful starting point for creating a custom main when 
 *   targeting a custom floating point processor or integer micro-controller.
 *
 *   Alternatively for ERT targets, you can generate a sample ert_main.c file 
 *   with the generated code by selecting the "Generate an example main program"
 *   option.  In this case, ert_main.c is precisely customized to the
 *   model requirements.  
 *
 * Required Defines:
 *
 *   MODEL - Model name
 *   NUMST - Number of sample times
 *
 */

[Fangjun Jiang]

Noted "* File: rt_main.c"?? not rt_main.cpp. Check the date for the file to see if it matches the date of other original files.

[Rasmus Visgaard]

Yes, that is weird to me too. The dates are not the same too.

[Rasmus Visgaard]

rt_main.cpp is from 26.05.2015

[Fangjun Jiang]

restore the original files (or try just rename the .cpp files to .c) and try again. CPP application can with with C files.

[Rasmus Visgaard]

I tried to rename .cpp files to .c and tried again. I got the following error:

I have renamed some directories for proprietary reasons to XXXXX.

Build started 16-03-2021 13:29:46.
     1>Project "C:\XXXXXX\Bladed\SimulinkModelDLL_grt_rtw\msvc\SimulinkModelDLL.vcxproj" on node 2 (Build target(s)).
     1>InitializeBuildStatus:
         Creating "x64\Debug\SimulinkModelDLL.unsuccessfulbuild" because "AlwaysCreate" was specified.
       ClCompile:
         C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\bin\x86_amd64\CL.exe /c /IC:\XXXXXX\Bladed /I"C:\Program Files\MATLAB\R2017a\simulink\include\sf_runtime" /IC:\XXXXXX\Bladed\SimulinkModelDLL_grt_rtw /I"C:\Program Files\MATLAB\R2017a\extern\include" /I"C:\Program Files\MATLAB\R2017a\simulink\include" /I"C:\Program Files\MATLAB\R2017a\rtw\c\src" /I"C:\Program Files\MATLAB\R2017a\rtw\c\src\ext_mode\common" /Zi /nologo /W2 /WX- /Od /D WIN32 /D _DEBUG /D _CONSOLE /D MODEL=SimulinkModelDLL /D NUMST=1 /D NCSTATES=0 /D HAVESTDIO= /D RT= /D USE_RTMODEL= /D MAT_FILE=1 /D INTEGER_CODE=0 /D MT=0 /D CLASSIC_INTERFACE=0 /D ALLOCATIONFCN=0 /D ONESTEPFCN=1 /D TERMFCN=1 /D MULTI_INSTANCE_CODE=0 /D TID01EQ=0 /Gm- /EHsc /RTC1 /MDd /GS /fp:precise /Zc:wchar_t /Zc:forScope /Fo"x64\Debug\\" /Fd"x64\Debug\vc110.pdb" /Gd /TC /errorReport:prompt "..\..\..\..\Program Files\MATLAB\R2017a\rtw\c\src\common\rt_main.c" "..\..\..\..\Program Files\MATLAB\R2017a\rtw\c\src\rt_logging.c"
         rt_main.c
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\xtgmath.h(111): warning C4602: #pragma pop_macro : 'new' no previous #pragma push_macro for this identifier
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(28): error C2061: syntax error : identifier 'acosf'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(28): error C2059: syntax error : ';'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(28): error C2061: syntax error : identifier 'asinf'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(29): error C2061: syntax error : identifier 'atanf'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(29): error C2059: syntax error : ';'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(29): error C2061: syntax error : identifier 'atan2f'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(29): error C2061: syntax error : identifier 'ceilf'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(30): error C2061: syntax error : identifier 'cosf'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(30): error C2059: syntax error : ';'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(30): error C2061: syntax error : identifier 'coshf'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(30): error C2061: syntax error : identifier 'expf'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(31): error C2061: syntax error : identifier 'fabsf'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(31): error C2059: syntax error : ';'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(31): error C2061: syntax error : identifier 'floorf'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(31): error C2061: syntax error : identifier 'fmodf'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(32): error C2061: syntax error : identifier 'frexpf'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(32): error C2059: syntax error : ';'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(32): error C2061: syntax error : identifier 'ldexpf'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(32): error C2061: syntax error : identifier 'logf'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(33): error C2061: syntax error : identifier 'log10f'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(33): error C2059: syntax error : ';'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(33): error C2061: syntax error : identifier 'modff'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(33): error C2061: syntax error : identifier 'powf'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(34): error C2061: syntax error : identifier 'sinf'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(34): error C2059: syntax error : ';'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(34): error C2061: syntax error : identifier 'sinhf'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(34): error C2061: syntax error : identifier 'sqrtf'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(35): error C2061: syntax error : identifier 'tanf'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(35): error C2059: syntax error : ';'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(35): error C2061: syntax error : identifier 'tanhf'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(37): error C2061: syntax error : identifier 'acosl'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(37): error C2059: syntax error : ';'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(37): error C2061: syntax error : identifier 'asinl'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(38): error C2061: syntax error : identifier 'atanl'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(38): error C2059: syntax error : ';'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(38): error C2061: syntax error : identifier 'atan2l'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(38): error C2061: syntax error : identifier 'ceill'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(39): error C2061: syntax error : identifier 'cosl'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(39): error C2059: syntax error : ';'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(39): error C2061: syntax error : identifier 'coshl'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(39): error C2061: syntax error : identifier 'expl'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(40): error C2061: syntax error : identifier 'fabsl'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(40): error C2059: syntax error : ';'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(40): error C2061: syntax error : identifier 'floorl'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(40): error C2061: syntax error : identifier 'fmodl'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(41): error C2061: syntax error : identifier 'frexpl'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(41): error C2059: syntax error : ';'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(41): error C2061: syntax error : identifier 'ldexpl'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(41): error C2061: syntax error : identifier 'logl'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(42): error C2061: syntax error : identifier 'log10l'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(42): error C2059: syntax error : ';'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(42): error C2061: syntax error : identifier 'modfl'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(42): error C2061: syntax error : identifier 'powl'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(43): error C2061: syntax error : identifier 'sinl'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(43): error C2059: syntax error : ';'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(43): error C2061: syntax error : identifier 'sinhl'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(43): error C2061: syntax error : identifier 'sqrtl'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(44): error C2061: syntax error : identifier 'tanl'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(44): error C2059: syntax error : ';'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(44): error C2061: syntax error : identifier 'tanhl'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(46): error C2061: syntax error : identifier 'abs'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(46): error C2059: syntax error : ';'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(48): error C2061: syntax error : identifier 'acos'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(48): error C2059: syntax error : ';'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(48): error C2061: syntax error : identifier 'asin'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(49): error C2061: syntax error : identifier 'atan'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(49): error C2059: syntax error : ';'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(49): error C2061: syntax error : identifier 'atan2'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(49): error C2061: syntax error : identifier 'ceil'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(50): error C2061: syntax error : identifier 'cos'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(50): error C2059: syntax error : ';'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(50): error C2061: syntax error : identifier 'cosh'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(50): error C2061: syntax error : identifier 'exp'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(51): error C2061: syntax error : identifier 'fabs'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(51): error C2059: syntax error : ';'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(51): error C2061: syntax error : identifier 'floor'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(51): error C2061: syntax error : identifier 'fmod'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(52): error C2061: syntax error : identifier 'frexp'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(52): error C2059: syntax error : ';'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(52): error C2061: syntax error : identifier 'ldexp'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(52): error C2061: syntax error : identifier 'log'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(53): error C2061: syntax error : identifier 'log10'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(53): error C2059: syntax error : ';'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(53): error C2061: syntax error : identifier 'modf'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(53): error C2061: syntax error : identifier 'pow'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(54): error C2061: syntax error : identifier 'sin'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(54): error C2059: syntax error : ';'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(54): error C2061: syntax error : identifier 'sinh'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(54): error C2061: syntax error : identifier 'sqrt'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(55): error C2061: syntax error : identifier 'tan'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(55): error C2059: syntax error : ';'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(55): error C2061: syntax error : identifier 'tanh'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(57): error C2061: syntax error : identifier 'hypot'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(57): error C2059: syntax error : ';'
     1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\cmath(57): error C2061: syntax error : identifier 'hypotf'
         rt_logging.c
         Generating Code...
     1>Done Building Project "C:\XXXXX\Bladed\SimulinkModelDLL_grt_rtw\msvc\SimulinkModelDLL.vcxproj" (Build target(s)) -- FAILED.

Build FAILED.

Time Elapsed 00:00:00.58

[Rasmus Visgaard]

Some further insight:

I tried changing the Simulink option to generate c-code, and I can both generate the code and build it using visual studio 2012 without problems. The issue seems to be, that if I want Simulink to generate c++ code, it's trying to locate rt_main.c and compile it as c++ for some reason. Changing the name of rt_main.c to rt_main.cpp does not help either, as it is, for another reason unknown, trying to locate the rt_main.c file which no longer exists.