mex compiler error with return value of '0'

I have used the MATLAB MinGW installation tool to install the MinGW compiler but I encounter the following error message when I try to run the basic 'yprime.c' mex example:

mex yprime.c

Building with 'MinGW64 Compiler (C)'.

Error using mex

The command 'C:\ProgramData\MATLAB\SupportPackages\R2019a\3P.instrset\mingw_w64.instrset\bin\gcc' exited with a return value '0'

The compiler seems to be installed correctly and MATLAB clearly has the correct path to the compiler executable but the return value of '0' indicates that MATLAB is calling the compiler with no arguments. This is the mex equivalent of 'hello world' so I'm guessing that something more fundamental is wrong here and I'd appreciate any pointers about what it might be.

I'm running MATLAB 2019a on a Windows 10 machine in admistrator mode so that it can write the appropriate files.

Thanks for the help,

Bryan

[James Tursa]

First thing is to do this in verbose mode. There may be some extra info/insights into what is going on.

mex yprime.c -v

[Bryan Munro]

James,

Thanks for the quick response; I'm a bit embarassed that I didn't realize there was a verbose mode to run in. I've pasted the outputs below in case something stands out to anyone who might be reading this thread. I'll post an update if I figure things out.

mex yprime.c -v

Verbose mode is on.

... Looking for compiler 'MinGW64 Compiler (C)' ...

... Looking for environment variable 'MW_MINGW64_LOC' ...Yes ('C:\ProgramData\MATLAB\SupportPackages\R2019a\3P.instrset\mingw_w64.instrset').

... Looking for file 'C:\ProgramData\MATLAB\SupportPackages\R2019a\3P.instrset\mingw_w64.instrset\bin\gcc.exe' ...Yes.

... Looking for folder 'C:\ProgramData\MATLAB\SupportPackages\R2019a\3P.instrset\mingw_w64.instrset' ...Yes.

Found installed compiler 'MinGW64 Compiler (C)'.

Set PATH = C:\ProgramData\MATLAB\SupportPackages\R2019a\3P.instrset\mingw_w64.instrset\bin;C:\Program Files\MATLAB\R2019a\extern\include\win64;C:\Program Files\MATLAB\R2019a\extern\include;C:\Program Files\MATLAB\R2019a\simulink\include;C:\Program Files\MATLAB\R2019a\lib\win64;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;C:\Program Files (x86)\Common Files\Oracle\Java\javapath;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Windows\System32\OpenSSH\;C:\Program Files\Intel\WiFi\bin\;C:\Program Files\Common Files\Intel\WirelessCommon\;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\MATLAB\R2019a\bin;C:\Program Files\MATLAB\R2018b\bin;C:\Program Files (x86)\Windows Kits\8.1\Windows Performance Toolkit\;C:\Users\BryanM\AppData\Local\Microsoft\WindowsApps

Set INCLUDE = C:\ProgramData\MATLAB\SupportPackages\R2019a\3P.instrset\mingw_w64.instrset\include;;

Set LIB = C:\ProgramData\MATLAB\SupportPackages\R2019a\3P.instrset\mingw_w64.instrset\lib;;

Set MW_TARGET_ARCH = win64;

Set LIBPATH = C:\Program Files\MATLAB\R2019a\extern\lib\win64;

Options file details

-------------------------------------------------------------------

Compiler location: C:\ProgramData\MATLAB\SupportPackages\R2019a\3P.instrset\mingw_w64.instrset

Options file: C:\Users\BryanM\AppData\Roaming\MathWorks\MATLAB\R2019a\mex_C_win64.xml

CMDLINE2 : C:\ProgramData\MATLAB\SupportPackages\R2019a\3P.instrset\mingw_w64.instrset\bin\gcc -m64 -Wl,--no-undefined -shared -static -s -Wl,"C:\Program Files\MATLAB\R2019a/extern/lib/win64/mingw64/exportsmexfileversion.def" C:\Users\BryanM\AppData\Local\Temp\mex_84792488536190_15280\yprime.obj C:\Users\BryanM\AppData\Local\Temp\mex_84792488536190_15280\c_mexapi_version.obj -L"C:\Program Files\MATLAB\R2019a\extern\lib\win64\mingw64" -llibmx -llibmex -llibmat -lm -llibmwlapack -llibmwblas -o yprime.mexw64

CC : C:\ProgramData\MATLAB\SupportPackages\R2019a\3P.instrset\mingw_w64.instrset\bin\gcc

COMPILER : C:\ProgramData\MATLAB\SupportPackages\R2019a\3P.instrset\mingw_w64.instrset\bin\gcc

DEFINES : -DMATLAB_DEFAULT_RELEASE=R2017b -DUSE_MEX_CMD -m64 -DMATLAB_MEX_FILE

MATLABMEX : -DMATLAB_MEX_FILE

CFLAGS : -fexceptions -fno-omit-frame-pointer

INCLUDE : -I"C:\Program Files\MATLAB\R2019a/extern/include" -I"C:\Program Files\MATLAB\R2019a/simulink/include" -I"C:\Program Files\MATLAB\R2019a/extern\lib\win64\mingw64"

COPTIMFLAGS : -O2 -fwrapv -DNDEBUG

CDEBUGFLAGS : -g

LD : C:\ProgramData\MATLAB\SupportPackages\R2019a\3P.instrset\mingw_w64.instrset\bin\gcc

LINKER : C:\ProgramData\MATLAB\SupportPackages\R2019a\3P.instrset\mingw_w64.instrset\bin\gcc

LDTYPE : -shared -static

LDFLAGS : -m64 -Wl,--no-undefined

LINKEXPORT : -Wl,"C:\Program Files\MATLAB\R2019a/extern/lib/win64/mingw64/mexFunction.def"

LINKEXPORTVER : -Wl,"C:\Program Files\MATLAB\R2019a/extern/lib/win64/mingw64/exportsmexfileversion.def"

LIBLOC : C:\Program Files\MATLAB\R2019a\extern\lib\win64\mingw64

LINKLIBS : -L"C:\Program Files\MATLAB\R2019a\extern\lib\win64\mingw64" -llibmx -llibmex -llibmat -lm -llibmwlapack -llibmwblas

LDOPTIMFLAGS : -s

LDDEBUGFLAGS : -g

OBJEXT : .obj

LDEXT : .mexw64

SETENV : set COMPILER=C:\ProgramData\MATLAB\SupportPackages\R2019a\3P.instrset\mingw_w64.instrset\bin\gcc

set CXXCOMPILER=C:\ProgramData\MATLAB\SupportPackages\R2019a\3P.instrset\mingw_w64.instrset\bin\g++

set COMPFLAGS=-c -fexceptions -fno-omit-frame-pointer -DMATLAB_DEFAULT_RELEASE=R2017b -DUSE_MEX_CMD -m64 -DMATLAB_MEX_FILE -DMATLAB_MEX_FILE

set CXXCOMPFLAGS=-c -fexceptions -fno-omit-frame-pointer -std=c++11 -DMATLAB_DEFAULT_RELEASE=R2017b -DUSE_MEX_CMD -m64 -DMATLAB_MEX_FILE -DMATLAB_MEX_FILE

set OPTIMFLAGS=-O2 -fwrapv -DNDEBUG

set DEBUGFLAGS=-g

set LINKER=C:\ProgramData\MATLAB\SupportPackages\R2019a\3P.instrset\mingw_w64.instrset\bin\gcc

set CXXLINKER=C:\ProgramData\MATLAB\SupportPackages\R2019a\3P.instrset\mingw_w64.instrset\bin\g++

set LINKFLAGS=-m64 -Wl,--no-undefined -shared -static -L"C:\Program Files\MATLAB\R2019a\extern\lib\win64\mingw64" -llibmx -llibmex -llibmat -lm -llibmwlapack -llibmwblas -Wl,"C:\Program Files\MATLAB\R2019a/extern/lib/win64/mingw64/mexFunction.def"

set LINKDEBUGFLAGS=-g

set NAME_OUTPUT=-o "%OUTDIR%%MEX_NAME%%MEX_EXT%"

MINGWROOT : C:\ProgramData\MATLAB\SupportPackages\R2019a\3P.instrset\mingw_w64.instrset

MATLABROOT : C:\Program Files\MATLAB\R2019a

ARCH : win64

SRC : "C:\Users\BryanM\Desktop\MEX Test\yprime.c";"C:\Program Files\MATLAB\R2019a\extern\version\c_mexapi_version.c"

OBJ : C:\Users\BryanM\AppData\Local\Temp\mex_84792488536190_15280\yprime.obj;C:\Users\BryanM\AppData\Local\Temp\mex_84792488536190_15280\c_mexapi_version.obj

OBJS : C:\Users\BryanM\AppData\Local\Temp\mex_84792488536190_15280\yprime.obj C:\Users\BryanM\AppData\Local\Temp\mex_84792488536190_15280\c_mexapi_version.obj

SRCROOT : C:\Users\BryanM\Desktop\MEX Test\yprime

DEF : C:\Users\BryanM\AppData\Local\Temp\mex_84792488536190_15280\yprime.def

EXP : "yprime.exp"

LIB : "yprime.lib"

EXE : yprime.mexw64

ILK : "yprime.ilk"

MANIFEST : "yprime.mexw64.manifest"

TEMPNAME : yprime

EXEDIR :

EXENAME : yprime

OPTIM : -O2 -fwrapv -DNDEBUG

LINKOPTIM : -s

CMDLINE1_0 : C:\ProgramData\MATLAB\SupportPackages\R2019a\3P.instrset\mingw_w64.instrset\bin\gcc -c -DMATLAB_DEFAULT_RELEASE=R2017b -DUSE_MEX_CMD -m64 -DMATLAB_MEX_FILE -I"C:\Program Files\MATLAB\R2019a/extern/include" -I"C:\Program Files\MATLAB\R2019a/simulink/include" -I"C:\Program Files\MATLAB\R2019a/extern\lib\win64\mingw64" -fexceptions -fno-omit-frame-pointer -O2 -fwrapv -DNDEBUG "C:\Users\BryanM\Desktop\MEX Test\yprime.c" -o C:\Users\BryanM\AppData\Local\Temp\mex_84792488536190_15280\yprime.obj

CMDLINE1_1 : C:\ProgramData\MATLAB\SupportPackages\R2019a\3P.instrset\mingw_w64.instrset\bin\gcc -c -DMATLAB_DEFAULT_RELEASE=R2017b -DUSE_MEX_CMD -m64 -DMATLAB_MEX_FILE -I"C:\Program Files\MATLAB\R2019a/extern/include" -I"C:\Program Files\MATLAB\R2019a/simulink/include" -I"C:\Program Files\MATLAB\R2019a/extern\lib\win64\mingw64" -fexceptions -fno-omit-frame-pointer -O2 -fwrapv -DNDEBUG "C:\Program Files\MATLAB\R2019a\extern\version\c_mexapi_version.c" -o C:\Users\BryanM\AppData\Local\Temp\mex_84792488536190_15280\c_mexapi_version.obj

-------------------------------------------------------------------

Building with 'MinGW64 Compiler (C)'.

C:\ProgramData\MATLAB\SupportPackages\R2019a\3P.instrset\mingw_w64.instrset\bin\gcc -c -DMATLAB_DEFAULT_RELEASE=R2017b -DUSE_MEX_CMD -m64 -DMATLAB_MEX_FILE -I"C:\Program Files\MATLAB\R2019a/extern/include" -I"C:\Program Files\MATLAB\R2019a/simulink/include" -I"C:\Program Files\MATLAB\R2019a/extern\lib\win64\mingw64" -fexceptions -fno-omit-frame-pointer -O2 -fwrapv -DNDEBUG "C:\Users\BryanM\Desktop\MEX Test\yprime.c" -o C:\Users\BryanM\AppData\Local\Temp\mex_84792488536190_15280\yprime.obj

C:\ProgramData\MATLAB\SupportPackages\R2019a\3P.instrset\mingw_w64.instrset\bin\gcc -c -DMATLAB_DEFAULT_RELEASE=R2017b -DUSE_MEX_CMD -m64 -DMATLAB_MEX_FILE -I"C:\Program Files\MATLAB\R2019a/extern/include" -I"C:\Program Files\MATLAB\R2019a/simulink/include" -I"C:\Program Files\MATLAB\R2019a/extern\lib\win64\mingw64" -fexceptions -fno-omit-frame-pointer -O2 -fwrapv -DNDEBUG "C:\Program Files\MATLAB\R2019a\extern\version\c_mexapi_version.c" -o C:\Users\BryanM\AppData\Local\Temp\mex_84792488536190_15280\c_mexapi_version.obj

C:\ProgramData\MATLAB\SupportPackages\R2019a\3P.instrset\mingw_w64.instrset\bin\gcc -m64 -Wl,--no-undefined -shared -static -s -Wl,"C:\Program Files\MATLAB\R2019a/extern/lib/win64/mingw64/exportsmexfileversion.def" C:\Users\BryanM\AppData\Local\Temp\mex_84792488536190_15280\yprime.obj C:\Users\BryanM\AppData\Local\Temp\mex_84792488536190_15280\c_mexapi_version.obj -L"C:\Program Files\MATLAB\R2019a\extern\lib\win64\mingw64" -llibmx -llibmex -llibmat -lm -llibmwlapack -llibmwblas -o yprime.mexw64

Error using mex

The command 'C:\ProgramData\MATLAB\SupportPackages\R2019a\3P.instrset\mingw_w64.instrset\bin\gcc' exited with a return value '0'

Answer 1

[Marko Järvenpää]

I had a similar problem using also MATLAB 2019a on a Windows 10 machine. I was able to circumvent the problem using manual installation of MinGW using the instructions in http://khailaie.com/notes/MEX/MEX-MinGW-setup-Windows.html

The instructions are actually given for 2017b but they worked with obvious changes for my 2019a.