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MATLAB gives “undefined reference” errors trying to use gfortran on Windows


gcc ignore casing of symbol names while linkingDoes symbol capitalization matter in object files with a linked dll?Cplex linking Error in Mex Command from MatlabMatlab Mex32 link error while compiling Felzenszwalb VOC on WindowsError in gfortran compilation : Undefined symbols for architecture x86_64compiling s-functions for matlaberror in unravel function for linking and decoding in huffman using matlabSimulink accelerator mode. Mex errorMatlab engine 2014a won't start under Windows 7 64 bit - missing a 2013a dllGfortran and Undefined reference to '__[module_name]_MOD_[function_name]'Calling MATLAB Engine error: libeng.dll is missing from your computerLinking error in gfortran with devtoolset-6






.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty
margin-bottom:0;









0















I'm trying to use MinGW gfortran with MATLAB R2019a on Windows 10 by writing a mexopts XML file based on existing XML files. I have cygwin installed with MinGW gcc, and I've been able to run mex -setup referencing the XML file successfully. When I try to compile the timestwo.F file to test the setup (using mex -R2018a timestwo.F90), I get a bunch of errors:



Building with 'cygwin MinGW64 Compiler (Fortran)'.
C:cygwin64binx86_64-w64-mingw32-gfortran -c -DMX_COMPAT_64 -DMATLAB_MEXCMD_RELEASE=R2018a -DUSE_MEX_CMD -I"C:Program FilesMATLABR2019aexterninclude" -I"C:Program FilesMATLABR2019asimulinkinclude" -I"C:Program FilesMATLABR2019aexternlibwin64mingw64" -fexceptions -fbackslash -fPIC -fno-omit-frame-pointer -O3 -mtune=native "C:cygwin64homeuserMATLABtimestwo.F90" -o C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o
f951: Warning: Nonexistent include directory ‘C:Program FilesMATLABR2019asimulinkinclude’ [-Wmissing-include-dirs]

C:cygwin64binx86_64-w64-mingw32-gfortran -c -DMX_COMPAT_64 -DMATLAB_MEXCMD_RELEASE=R2018a -DUSE_MEX_CMD -I"C:Program FilesMATLABR2019aexterninclude" -I"C:Program FilesMATLABR2019asimulinkinclude" -I"C:Program FilesMATLABR2019aexternlibwin64mingw64" -fexceptions -fbackslash -fPIC -fno-omit-frame-pointer -O3 -mtune=native "C:Program FilesMATLABR2019aexternversionfortran_mexapi_version.F" -o C:UsersuserAppDataLocalTempmex_62691295256641_4248fortran_mexapi_version.o
f951: Warning: Nonexistent include directory ‘C:Program FilesMATLABR2019asimulinkinclude’ [-Wmissing-include-dirs]

C:cygwin64binx86_64-w64-mingw32-gfortran -pthread -shared -O3 -mtune=native -Wl,--version-script,"C:Program FilesMATLABR2019aexternlibwin64mingw64fortran_exportsmexfileversion.map" C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o C:UsersuserAppDataLocalTempmex_62691295256641_4248fortran_mexapi_version.o -Wl,-L"C:Program FilesMATLABR2019aexternlibwin64mingw64" -llibmx -llibmex -llibmat -lm -L"C:cygwin64libgccx86_64-w64-mingw327.4.0" -lgfortran -o timestwo.mexw64
Error using mex
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0x47): undefined reference to
`mxisnumeric800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0x6a): undefined reference to
`mexerrmsgidandtxt800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0x72): undefined reference to
`mxgetdoubles800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0x7d): undefined reference to `mxgetm800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0x8c): undefined reference to `mxgetn800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0xa6): undefined reference to
`mxcopyptrtoreal8800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0xba): undefined reference to
`mxcreatedoublematrix800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0xc4): undefined reference to
`mxgetdoubles800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0xe5): undefined reference to
`mxcopyreal8toptr800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0x10d): undefined reference to
`mexerrmsgidandtxt800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0x13b): undefined reference to
`mexerrmsgidandtxt800_'
collect2: error: ld returned 1 exit status


Here's my source:



! Gateway routine
#include "fintrf.h"

subroutine mexFunction(nlhs, plhs, nrhs, prhs)
implicit none

mwPointer plhs(*), prhs(*)
integer nlhs, nrhs

! Declarations
mwPointer mxGetDoubles
mwPointer mxCreateDoubleMatrix
integer mxIsNumeric
mwPointer mxGetM, mxGetN

mwPointer x_ptr, y_ptr

mwPointer mrows, ncols
mwSize size

! Declare variables for computational routine
real*8 x_input, y_output

! Make sure input is valid
if(nrhs /= 1) then
 call mexErrMsgIdAndTxt ('MATLAB:timestwo:nInput', &
 'One input required.')
elseif(nlhs > 1) then
 call mexErrMsgIdAndTxt ('MATLAB:timestwo:nOutput', &
 'Too many output arguments.')
endif

if(mxIsNumeric(prhs(1)) == 0) then
 call mexErrMsgIdAndTxt ('MATLAB:timestwo:NonNumeric', &
 'Input must be a number.')
endif

! Read input array
x_ptr = mxGetDoubles(prhs(1))

! Get size of array
mrows = mxGetM(prhs(1))
ncols = mxGetN(prhs(1))
size = mrows*ncols

! Create a Fortran array from the input
call mxCopyPtrToReal8(x_ptr,x_input,size)

! Prepare a matrix for output
plhs(1) = mxCreateDoubleMatrix(mrows,ncols,0)

y_ptr = mxGetDoubles(plhs(1))

call timestwo(y_output, x_input)

! copy results to output argument
call mxCopyReal8ToPtr(y_output,y_ptr,size)

return
end

subroutine timestwo(y_output, x_input)
real*8 x_input, y_output

y_output = 2.0*x_input
return
end


The output is the same if I try with the included matlabrootexternexamplesrefbooktimestwo.F fixed-form version.



My options file details (first part of output from mex -v -R2018a timestwo.F90)



Compiler location: C:cygwin64
 Options file: C:UsersuserAppDataRoamingMathWorksMATLABR2019amex_FORTRAN_win64.xml
 CMDLINE2 : C:cygwin64binx86_64-w64-mingw32-gfortran -pthread -shared -O3 -mtune=native -Wl,--version-script,"C:Program FilesMATLABR2019aexternlibwin64mingw64fortran_exportsmexfileversion.map" C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o C:UsersuserAppDataLocalTempmex_62691295256641_4248fortran_mexapi_version.o -Wl,-L"C:Program FilesMATLABR2019aexternlibwin64mingw64" -llibmx -llibmex -llibmat -lm -L"C:cygwin64libgccx86_64-w64-mingw327.4.0" -lgfortran -o timestwo.mexw64
 FC : C:cygwin64binx86_64-w64-mingw32-gfortran
 DEFINES : -DMX_COMPAT_64 -DMATLAB_MEXCMD_RELEASE=R2018a -DUSE_MEX_CMD 
 FFLAGS : -fexceptions -fbackslash -fPIC -fno-omit-frame-pointer
 INCLUDE : -I"C:Program FilesMATLABR2019aexterninclude" -I"C:Program FilesMATLABR2019asimulinkinclude" -I"C:Program FilesMATLABR2019aexternlibwin64mingw64"
 FOPTIMFLAGS : -O3 -mtune=native
 FDEBUGFLAGS : -g -Wall
 LDF : C:cygwin64binx86_64-w64-mingw32-gfortran
 LDFLAGS : -pthread
 LDTYPE : -shared
 LINKEXPORT : -Wl,--version-script,"C:Program FilesMATLABR2019aexternlibwin64mingw64fexport.map"
 LINKEXPORTVER : -Wl,--version-script,"C:Program FilesMATLABR2019aexternlibwin64mingw64fortran_exportsmexfileversion.map"
 LINKLIBS : -Wl,-L"C:Program FilesMATLABR2019aexternlibwin64mingw64" -llibmx -llibmex -llibmat -lm -L"C:cygwin64libgccx86_64-w64-mingw327.4.0" -lgfortran
 LDOPTIMFLAGS : -O3 -mtune=native
 LDDEBUGFLAGS : -g -Wall
 OBJEXT : .o
 LDEXT : .mexw64
 SETENV : set COMPILER=C:cygwin64binx86_64-w64-mingw32-gfortran
 set COMPFLAGS=-fexceptions -fbackslash -fPIC -fno-omit-frame-pointer -DMX_COMPAT_64 -DMATLAB_MEXCMD_RELEASE=R2018a -DUSE_MEX_CMD 
 set OPTIMFLAGS=-O3 -mtune=native
 set DEBUGFLAGS=-g -Wall
 set LINKER=C:cygwin64binx86_64-w64-mingw32-gfortran
 set LINKFLAGS=-pthread
 set LINKDEBUGFLAGS=-pthread -shared -Wl,-L"C:Program FilesMATLABR2019aexternlibwin64mingw64" -llibmx -llibmex -llibmat -lm -L"C:cygwin64libgccx86_64-w64-mingw327.4.0" -lgfortran -Wl,--version-script,"C:Program FilesMATLABR2019aexternlibwin64mingw64fexport.map"
 set LDDEBUGFLAGS=-g -Wall
 set NAME_OUTPUT=-o "%OUTDIR%%MEX_NAME%%MEX_EXT%%"
 CYGWINROOT : C:cygwin64
 MATLABROOT : C:Program FilesMATLABR2019a
 ARCH : win64
 SRC : "C:cygwin64homeuserMATLABtimestwo.F90";"C:Program FilesMATLABR2019aexternversionfortran_mexapi_version.F"
 OBJ : C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o;C:UsersuserAppDataLocalTempmex_62691295256641_4248fortran_mexapi_version.o
 OBJS : C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o C:UsersuserAppDataLocalTempmex_62691295256641_4248fortran_mexapi_version.o 
 SRCROOT : C:cygwin64homeuserMATLABtimestwo
 DEF : C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.def
 EXP : "timestwo.exp"
 LIB : "timestwo.lib"
 EXE : timestwo.mexw64
 ILK : "timestwo.ilk"
 MANIFEST : "timestwo.mexw64.manifest"
 TEMPNAME : timestwo
 EXEDIR : 
 EXENAME : timestwo
 OPTIM : -O3 -mtune=native
 LINKOPTIM : -O3 -mtune=native
 CMDLINE1_0 : C:cygwin64binx86_64-w64-mingw32-gfortran -c -DMX_COMPAT_64 -DMATLAB_MEXCMD_RELEASE=R2018a -DUSE_MEX_CMD -I"C:Program FilesMATLABR2019aexterninclude" -I"C:Program FilesMATLABR2019asimulinkinclude" -I"C:Program FilesMATLABR2019aexternlibwin64mingw64" -fexceptions -fbackslash -fPIC -fno-omit-frame-pointer -O3 -mtune=native "C:cygwin64homeuserMATLABtimestwo.F90" -o C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o
 CMDLINE1_1 : C:cygwin64binx86_64-w64-mingw32-gfortran -c -DMX_COMPAT_64 -DMATLAB_MEXCMD_RELEASE=R2018a -DUSE_MEX_CMD -I"C:Program FilesMATLABR2019aexterninclude" -I"C:Program FilesMATLABR2019asimulinkinclude" -I"C:Program FilesMATLABR2019aexternlibwin64mingw64" -fexceptions -fbackslash -fPIC -fno-omit-frame-pointer -O3 -mtune=native "C:Program FilesMATLABR2019aexternversionfortran_mexapi_version.F" -o C:UsersuserAppDataLocalTempmex_62691295256641_4248fortran_mexapi_version.o


It seems like the mex-specific types like mwPointer defined in fintrf.h aren't being defined, even though I've included its location. Why are these types not recognized?






matlab fortran gfortran mex







share|improve this question



















  • 1





    Are you sure you should declare the MATLAB functions? mwPointer mxGetDoubles . Aren't those defined in the header file you include? These functions should likely be declared as extern C (or however you do that in Fortran), which would fix your capitalization issue.

    – Cris Luengo
    Apr 3 at 16:46











  • This is how MathWorks specifies the Fortran test file, so that was how I wrote my copy. mxGetDoubles is defined in the header file, but if I remove the declaration, I get Error: Function ‘mxgetdoubles800’ at (1) has no IMPLICIT type

    – zaen
    Apr 3 at 16:51











  • I see. Fortran is a weird language... :) -- Did you try compiling one of the demos that come with MATLAB? mex([matlabroot '/extern/examples/refbook/timestwo.F']).

    – Cris Luengo
    Apr 3 at 17:03











  • Yes, those fail as well. They succeed on Linux, and I think I've found the reason. The Linux libraries export symbols in a gfortran-compatible way, e.g. mxisnumeric800_. The underscore can be removed with -fno-underscoring, but the gfortran developers didn't include the -fsymbol-case-upper option from g77. That, I'm pretty sure, is the problem; gfortran forces symbols to be lowercase, while the Intel compiler goes for uppercase.

    – zaen
    Apr 3 at 17:10











  • Ah, that must be it. MATLAB supports the Intel Fortran compiler only on Windows.

    – Cris Luengo
    Apr 3 at 17:15

















0















I'm trying to use MinGW gfortran with MATLAB R2019a on Windows 10 by writing a mexopts XML file based on existing XML files. I have cygwin installed with MinGW gcc, and I've been able to run mex -setup referencing the XML file successfully. When I try to compile the timestwo.F file to test the setup (using mex -R2018a timestwo.F90), I get a bunch of errors:



Building with 'cygwin MinGW64 Compiler (Fortran)'.
C:cygwin64binx86_64-w64-mingw32-gfortran -c -DMX_COMPAT_64 -DMATLAB_MEXCMD_RELEASE=R2018a -DUSE_MEX_CMD -I"C:Program FilesMATLABR2019aexterninclude" -I"C:Program FilesMATLABR2019asimulinkinclude" -I"C:Program FilesMATLABR2019aexternlibwin64mingw64" -fexceptions -fbackslash -fPIC -fno-omit-frame-pointer -O3 -mtune=native "C:cygwin64homeuserMATLABtimestwo.F90" -o C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o
f951: Warning: Nonexistent include directory ‘C:Program FilesMATLABR2019asimulinkinclude’ [-Wmissing-include-dirs]

C:cygwin64binx86_64-w64-mingw32-gfortran -c -DMX_COMPAT_64 -DMATLAB_MEXCMD_RELEASE=R2018a -DUSE_MEX_CMD -I"C:Program FilesMATLABR2019aexterninclude" -I"C:Program FilesMATLABR2019asimulinkinclude" -I"C:Program FilesMATLABR2019aexternlibwin64mingw64" -fexceptions -fbackslash -fPIC -fno-omit-frame-pointer -O3 -mtune=native "C:Program FilesMATLABR2019aexternversionfortran_mexapi_version.F" -o C:UsersuserAppDataLocalTempmex_62691295256641_4248fortran_mexapi_version.o
f951: Warning: Nonexistent include directory ‘C:Program FilesMATLABR2019asimulinkinclude’ [-Wmissing-include-dirs]

C:cygwin64binx86_64-w64-mingw32-gfortran -pthread -shared -O3 -mtune=native -Wl,--version-script,"C:Program FilesMATLABR2019aexternlibwin64mingw64fortran_exportsmexfileversion.map" C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o C:UsersuserAppDataLocalTempmex_62691295256641_4248fortran_mexapi_version.o -Wl,-L"C:Program FilesMATLABR2019aexternlibwin64mingw64" -llibmx -llibmex -llibmat -lm -L"C:cygwin64libgccx86_64-w64-mingw327.4.0" -lgfortran -o timestwo.mexw64
Error using mex
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0x47): undefined reference to
`mxisnumeric800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0x6a): undefined reference to
`mexerrmsgidandtxt800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0x72): undefined reference to
`mxgetdoubles800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0x7d): undefined reference to `mxgetm800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0x8c): undefined reference to `mxgetn800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0xa6): undefined reference to
`mxcopyptrtoreal8800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0xba): undefined reference to
`mxcreatedoublematrix800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0xc4): undefined reference to
`mxgetdoubles800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0xe5): undefined reference to
`mxcopyreal8toptr800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0x10d): undefined reference to
`mexerrmsgidandtxt800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0x13b): undefined reference to
`mexerrmsgidandtxt800_'
collect2: error: ld returned 1 exit status


Here's my source:



! Gateway routine
#include "fintrf.h"

subroutine mexFunction(nlhs, plhs, nrhs, prhs)
implicit none

mwPointer plhs(*), prhs(*)
integer nlhs, nrhs

! Declarations
mwPointer mxGetDoubles
mwPointer mxCreateDoubleMatrix
integer mxIsNumeric
mwPointer mxGetM, mxGetN

mwPointer x_ptr, y_ptr

mwPointer mrows, ncols
mwSize size

! Declare variables for computational routine
real*8 x_input, y_output

! Make sure input is valid
if(nrhs /= 1) then
 call mexErrMsgIdAndTxt ('MATLAB:timestwo:nInput', &
 'One input required.')
elseif(nlhs > 1) then
 call mexErrMsgIdAndTxt ('MATLAB:timestwo:nOutput', &
 'Too many output arguments.')
endif

if(mxIsNumeric(prhs(1)) == 0) then
 call mexErrMsgIdAndTxt ('MATLAB:timestwo:NonNumeric', &
 'Input must be a number.')
endif

! Read input array
x_ptr = mxGetDoubles(prhs(1))

! Get size of array
mrows = mxGetM(prhs(1))
ncols = mxGetN(prhs(1))
size = mrows*ncols

! Create a Fortran array from the input
call mxCopyPtrToReal8(x_ptr,x_input,size)

! Prepare a matrix for output
plhs(1) = mxCreateDoubleMatrix(mrows,ncols,0)

y_ptr = mxGetDoubles(plhs(1))

call timestwo(y_output, x_input)

! copy results to output argument
call mxCopyReal8ToPtr(y_output,y_ptr,size)

return
end

subroutine timestwo(y_output, x_input)
real*8 x_input, y_output

y_output = 2.0*x_input
return
end


The output is the same if I try with the included matlabrootexternexamplesrefbooktimestwo.F fixed-form version.



My options file details (first part of output from mex -v -R2018a timestwo.F90)



Compiler location: C:cygwin64
 Options file: C:UsersuserAppDataRoamingMathWorksMATLABR2019amex_FORTRAN_win64.xml
 CMDLINE2 : C:cygwin64binx86_64-w64-mingw32-gfortran -pthread -shared -O3 -mtune=native -Wl,--version-script,"C:Program FilesMATLABR2019aexternlibwin64mingw64fortran_exportsmexfileversion.map" C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o C:UsersuserAppDataLocalTempmex_62691295256641_4248fortran_mexapi_version.o -Wl,-L"C:Program FilesMATLABR2019aexternlibwin64mingw64" -llibmx -llibmex -llibmat -lm -L"C:cygwin64libgccx86_64-w64-mingw327.4.0" -lgfortran -o timestwo.mexw64
 FC : C:cygwin64binx86_64-w64-mingw32-gfortran
 DEFINES : -DMX_COMPAT_64 -DMATLAB_MEXCMD_RELEASE=R2018a -DUSE_MEX_CMD 
 FFLAGS : -fexceptions -fbackslash -fPIC -fno-omit-frame-pointer
 INCLUDE : -I"C:Program FilesMATLABR2019aexterninclude" -I"C:Program FilesMATLABR2019asimulinkinclude" -I"C:Program FilesMATLABR2019aexternlibwin64mingw64"
 FOPTIMFLAGS : -O3 -mtune=native
 FDEBUGFLAGS : -g -Wall
 LDF : C:cygwin64binx86_64-w64-mingw32-gfortran
 LDFLAGS : -pthread
 LDTYPE : -shared
 LINKEXPORT : -Wl,--version-script,"C:Program FilesMATLABR2019aexternlibwin64mingw64fexport.map"
 LINKEXPORTVER : -Wl,--version-script,"C:Program FilesMATLABR2019aexternlibwin64mingw64fortran_exportsmexfileversion.map"
 LINKLIBS : -Wl,-L"C:Program FilesMATLABR2019aexternlibwin64mingw64" -llibmx -llibmex -llibmat -lm -L"C:cygwin64libgccx86_64-w64-mingw327.4.0" -lgfortran
 LDOPTIMFLAGS : -O3 -mtune=native
 LDDEBUGFLAGS : -g -Wall
 OBJEXT : .o
 LDEXT : .mexw64
 SETENV : set COMPILER=C:cygwin64binx86_64-w64-mingw32-gfortran
 set COMPFLAGS=-fexceptions -fbackslash -fPIC -fno-omit-frame-pointer -DMX_COMPAT_64 -DMATLAB_MEXCMD_RELEASE=R2018a -DUSE_MEX_CMD 
 set OPTIMFLAGS=-O3 -mtune=native
 set DEBUGFLAGS=-g -Wall
 set LINKER=C:cygwin64binx86_64-w64-mingw32-gfortran
 set LINKFLAGS=-pthread
 set LINKDEBUGFLAGS=-pthread -shared -Wl,-L"C:Program FilesMATLABR2019aexternlibwin64mingw64" -llibmx -llibmex -llibmat -lm -L"C:cygwin64libgccx86_64-w64-mingw327.4.0" -lgfortran -Wl,--version-script,"C:Program FilesMATLABR2019aexternlibwin64mingw64fexport.map"
 set LDDEBUGFLAGS=-g -Wall
 set NAME_OUTPUT=-o "%OUTDIR%%MEX_NAME%%MEX_EXT%%"
 CYGWINROOT : C:cygwin64
 MATLABROOT : C:Program FilesMATLABR2019a
 ARCH : win64
 SRC : "C:cygwin64homeuserMATLABtimestwo.F90";"C:Program FilesMATLABR2019aexternversionfortran_mexapi_version.F"
 OBJ : C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o;C:UsersuserAppDataLocalTempmex_62691295256641_4248fortran_mexapi_version.o
 OBJS : C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o C:UsersuserAppDataLocalTempmex_62691295256641_4248fortran_mexapi_version.o 
 SRCROOT : C:cygwin64homeuserMATLABtimestwo
 DEF : C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.def
 EXP : "timestwo.exp"
 LIB : "timestwo.lib"
 EXE : timestwo.mexw64
 ILK : "timestwo.ilk"
 MANIFEST : "timestwo.mexw64.manifest"
 TEMPNAME : timestwo
 EXEDIR : 
 EXENAME : timestwo
 OPTIM : -O3 -mtune=native
 LINKOPTIM : -O3 -mtune=native
 CMDLINE1_0 : C:cygwin64binx86_64-w64-mingw32-gfortran -c -DMX_COMPAT_64 -DMATLAB_MEXCMD_RELEASE=R2018a -DUSE_MEX_CMD -I"C:Program FilesMATLABR2019aexterninclude" -I"C:Program FilesMATLABR2019asimulinkinclude" -I"C:Program FilesMATLABR2019aexternlibwin64mingw64" -fexceptions -fbackslash -fPIC -fno-omit-frame-pointer -O3 -mtune=native "C:cygwin64homeuserMATLABtimestwo.F90" -o C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o
 CMDLINE1_1 : C:cygwin64binx86_64-w64-mingw32-gfortran -c -DMX_COMPAT_64 -DMATLAB_MEXCMD_RELEASE=R2018a -DUSE_MEX_CMD -I"C:Program FilesMATLABR2019aexterninclude" -I"C:Program FilesMATLABR2019asimulinkinclude" -I"C:Program FilesMATLABR2019aexternlibwin64mingw64" -fexceptions -fbackslash -fPIC -fno-omit-frame-pointer -O3 -mtune=native "C:Program FilesMATLABR2019aexternversionfortran_mexapi_version.F" -o C:UsersuserAppDataLocalTempmex_62691295256641_4248fortran_mexapi_version.o


It seems like the mex-specific types like mwPointer defined in fintrf.h aren't being defined, even though I've included its location. Why are these types not recognized?






matlab fortran gfortran mex







share|improve this question



















  • 1





    Are you sure you should declare the MATLAB functions? mwPointer mxGetDoubles . Aren't those defined in the header file you include? These functions should likely be declared as extern C (or however you do that in Fortran), which would fix your capitalization issue.

    – Cris Luengo
    Apr 3 at 16:46











  • This is how MathWorks specifies the Fortran test file, so that was how I wrote my copy. mxGetDoubles is defined in the header file, but if I remove the declaration, I get Error: Function ‘mxgetdoubles800’ at (1) has no IMPLICIT type

    – zaen
    Apr 3 at 16:51











  • I see. Fortran is a weird language... :) -- Did you try compiling one of the demos that come with MATLAB? mex([matlabroot '/extern/examples/refbook/timestwo.F']).

    – Cris Luengo
    Apr 3 at 17:03











  • Yes, those fail as well. They succeed on Linux, and I think I've found the reason. The Linux libraries export symbols in a gfortran-compatible way, e.g. mxisnumeric800_. The underscore can be removed with -fno-underscoring, but the gfortran developers didn't include the -fsymbol-case-upper option from g77. That, I'm pretty sure, is the problem; gfortran forces symbols to be lowercase, while the Intel compiler goes for uppercase.

    – zaen
    Apr 3 at 17:10











  • Ah, that must be it. MATLAB supports the Intel Fortran compiler only on Windows.

    – Cris Luengo
    Apr 3 at 17:15













0












0








0








I'm trying to use MinGW gfortran with MATLAB R2019a on Windows 10 by writing a mexopts XML file based on existing XML files. I have cygwin installed with MinGW gcc, and I've been able to run mex -setup referencing the XML file successfully. When I try to compile the timestwo.F file to test the setup (using mex -R2018a timestwo.F90), I get a bunch of errors:



Building with 'cygwin MinGW64 Compiler (Fortran)'.
C:cygwin64binx86_64-w64-mingw32-gfortran -c -DMX_COMPAT_64 -DMATLAB_MEXCMD_RELEASE=R2018a -DUSE_MEX_CMD -I"C:Program FilesMATLABR2019aexterninclude" -I"C:Program FilesMATLABR2019asimulinkinclude" -I"C:Program FilesMATLABR2019aexternlibwin64mingw64" -fexceptions -fbackslash -fPIC -fno-omit-frame-pointer -O3 -mtune=native "C:cygwin64homeuserMATLABtimestwo.F90" -o C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o
f951: Warning: Nonexistent include directory ‘C:Program FilesMATLABR2019asimulinkinclude’ [-Wmissing-include-dirs]

C:cygwin64binx86_64-w64-mingw32-gfortran -c -DMX_COMPAT_64 -DMATLAB_MEXCMD_RELEASE=R2018a -DUSE_MEX_CMD -I"C:Program FilesMATLABR2019aexterninclude" -I"C:Program FilesMATLABR2019asimulinkinclude" -I"C:Program FilesMATLABR2019aexternlibwin64mingw64" -fexceptions -fbackslash -fPIC -fno-omit-frame-pointer -O3 -mtune=native "C:Program FilesMATLABR2019aexternversionfortran_mexapi_version.F" -o C:UsersuserAppDataLocalTempmex_62691295256641_4248fortran_mexapi_version.o
f951: Warning: Nonexistent include directory ‘C:Program FilesMATLABR2019asimulinkinclude’ [-Wmissing-include-dirs]

C:cygwin64binx86_64-w64-mingw32-gfortran -pthread -shared -O3 -mtune=native -Wl,--version-script,"C:Program FilesMATLABR2019aexternlibwin64mingw64fortran_exportsmexfileversion.map" C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o C:UsersuserAppDataLocalTempmex_62691295256641_4248fortran_mexapi_version.o -Wl,-L"C:Program FilesMATLABR2019aexternlibwin64mingw64" -llibmx -llibmex -llibmat -lm -L"C:cygwin64libgccx86_64-w64-mingw327.4.0" -lgfortran -o timestwo.mexw64
Error using mex
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0x47): undefined reference to
`mxisnumeric800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0x6a): undefined reference to
`mexerrmsgidandtxt800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0x72): undefined reference to
`mxgetdoubles800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0x7d): undefined reference to `mxgetm800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0x8c): undefined reference to `mxgetn800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0xa6): undefined reference to
`mxcopyptrtoreal8800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0xba): undefined reference to
`mxcreatedoublematrix800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0xc4): undefined reference to
`mxgetdoubles800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0xe5): undefined reference to
`mxcopyreal8toptr800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0x10d): undefined reference to
`mexerrmsgidandtxt800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0x13b): undefined reference to
`mexerrmsgidandtxt800_'
collect2: error: ld returned 1 exit status


Here's my source:



! Gateway routine
#include "fintrf.h"

subroutine mexFunction(nlhs, plhs, nrhs, prhs)
implicit none

mwPointer plhs(*), prhs(*)
integer nlhs, nrhs

! Declarations
mwPointer mxGetDoubles
mwPointer mxCreateDoubleMatrix
integer mxIsNumeric
mwPointer mxGetM, mxGetN

mwPointer x_ptr, y_ptr

mwPointer mrows, ncols
mwSize size

! Declare variables for computational routine
real*8 x_input, y_output

! Make sure input is valid
if(nrhs /= 1) then
 call mexErrMsgIdAndTxt ('MATLAB:timestwo:nInput', &
 'One input required.')
elseif(nlhs > 1) then
 call mexErrMsgIdAndTxt ('MATLAB:timestwo:nOutput', &
 'Too many output arguments.')
endif

if(mxIsNumeric(prhs(1)) == 0) then
 call mexErrMsgIdAndTxt ('MATLAB:timestwo:NonNumeric', &
 'Input must be a number.')
endif

! Read input array
x_ptr = mxGetDoubles(prhs(1))

! Get size of array
mrows = mxGetM(prhs(1))
ncols = mxGetN(prhs(1))
size = mrows*ncols

! Create a Fortran array from the input
call mxCopyPtrToReal8(x_ptr,x_input,size)

! Prepare a matrix for output
plhs(1) = mxCreateDoubleMatrix(mrows,ncols,0)

y_ptr = mxGetDoubles(plhs(1))

call timestwo(y_output, x_input)

! copy results to output argument
call mxCopyReal8ToPtr(y_output,y_ptr,size)

return
end

subroutine timestwo(y_output, x_input)
real*8 x_input, y_output

y_output = 2.0*x_input
return
end


The output is the same if I try with the included matlabrootexternexamplesrefbooktimestwo.F fixed-form version.



My options file details (first part of output from mex -v -R2018a timestwo.F90)



Compiler location: C:cygwin64
 Options file: C:UsersuserAppDataRoamingMathWorksMATLABR2019amex_FORTRAN_win64.xml
 CMDLINE2 : C:cygwin64binx86_64-w64-mingw32-gfortran -pthread -shared -O3 -mtune=native -Wl,--version-script,"C:Program FilesMATLABR2019aexternlibwin64mingw64fortran_exportsmexfileversion.map" C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o C:UsersuserAppDataLocalTempmex_62691295256641_4248fortran_mexapi_version.o -Wl,-L"C:Program FilesMATLABR2019aexternlibwin64mingw64" -llibmx -llibmex -llibmat -lm -L"C:cygwin64libgccx86_64-w64-mingw327.4.0" -lgfortran -o timestwo.mexw64
 FC : C:cygwin64binx86_64-w64-mingw32-gfortran
 DEFINES : -DMX_COMPAT_64 -DMATLAB_MEXCMD_RELEASE=R2018a -DUSE_MEX_CMD 
 FFLAGS : -fexceptions -fbackslash -fPIC -fno-omit-frame-pointer
 INCLUDE : -I"C:Program FilesMATLABR2019aexterninclude" -I"C:Program FilesMATLABR2019asimulinkinclude" -I"C:Program FilesMATLABR2019aexternlibwin64mingw64"
 FOPTIMFLAGS : -O3 -mtune=native
 FDEBUGFLAGS : -g -Wall
 LDF : C:cygwin64binx86_64-w64-mingw32-gfortran
 LDFLAGS : -pthread
 LDTYPE : -shared
 LINKEXPORT : -Wl,--version-script,"C:Program FilesMATLABR2019aexternlibwin64mingw64fexport.map"
 LINKEXPORTVER : -Wl,--version-script,"C:Program FilesMATLABR2019aexternlibwin64mingw64fortran_exportsmexfileversion.map"
 LINKLIBS : -Wl,-L"C:Program FilesMATLABR2019aexternlibwin64mingw64" -llibmx -llibmex -llibmat -lm -L"C:cygwin64libgccx86_64-w64-mingw327.4.0" -lgfortran
 LDOPTIMFLAGS : -O3 -mtune=native
 LDDEBUGFLAGS : -g -Wall
 OBJEXT : .o
 LDEXT : .mexw64
 SETENV : set COMPILER=C:cygwin64binx86_64-w64-mingw32-gfortran
 set COMPFLAGS=-fexceptions -fbackslash -fPIC -fno-omit-frame-pointer -DMX_COMPAT_64 -DMATLAB_MEXCMD_RELEASE=R2018a -DUSE_MEX_CMD 
 set OPTIMFLAGS=-O3 -mtune=native
 set DEBUGFLAGS=-g -Wall
 set LINKER=C:cygwin64binx86_64-w64-mingw32-gfortran
 set LINKFLAGS=-pthread
 set LINKDEBUGFLAGS=-pthread -shared -Wl,-L"C:Program FilesMATLABR2019aexternlibwin64mingw64" -llibmx -llibmex -llibmat -lm -L"C:cygwin64libgccx86_64-w64-mingw327.4.0" -lgfortran -Wl,--version-script,"C:Program FilesMATLABR2019aexternlibwin64mingw64fexport.map"
 set LDDEBUGFLAGS=-g -Wall
 set NAME_OUTPUT=-o "%OUTDIR%%MEX_NAME%%MEX_EXT%%"
 CYGWINROOT : C:cygwin64
 MATLABROOT : C:Program FilesMATLABR2019a
 ARCH : win64
 SRC : "C:cygwin64homeuserMATLABtimestwo.F90";"C:Program FilesMATLABR2019aexternversionfortran_mexapi_version.F"
 OBJ : C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o;C:UsersuserAppDataLocalTempmex_62691295256641_4248fortran_mexapi_version.o
 OBJS : C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o C:UsersuserAppDataLocalTempmex_62691295256641_4248fortran_mexapi_version.o 
 SRCROOT : C:cygwin64homeuserMATLABtimestwo
 DEF : C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.def
 EXP : "timestwo.exp"
 LIB : "timestwo.lib"
 EXE : timestwo.mexw64
 ILK : "timestwo.ilk"
 MANIFEST : "timestwo.mexw64.manifest"
 TEMPNAME : timestwo
 EXEDIR : 
 EXENAME : timestwo
 OPTIM : -O3 -mtune=native
 LINKOPTIM : -O3 -mtune=native
 CMDLINE1_0 : C:cygwin64binx86_64-w64-mingw32-gfortran -c -DMX_COMPAT_64 -DMATLAB_MEXCMD_RELEASE=R2018a -DUSE_MEX_CMD -I"C:Program FilesMATLABR2019aexterninclude" -I"C:Program FilesMATLABR2019asimulinkinclude" -I"C:Program FilesMATLABR2019aexternlibwin64mingw64" -fexceptions -fbackslash -fPIC -fno-omit-frame-pointer -O3 -mtune=native "C:cygwin64homeuserMATLABtimestwo.F90" -o C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o
 CMDLINE1_1 : C:cygwin64binx86_64-w64-mingw32-gfortran -c -DMX_COMPAT_64 -DMATLAB_MEXCMD_RELEASE=R2018a -DUSE_MEX_CMD -I"C:Program FilesMATLABR2019aexterninclude" -I"C:Program FilesMATLABR2019asimulinkinclude" -I"C:Program FilesMATLABR2019aexternlibwin64mingw64" -fexceptions -fbackslash -fPIC -fno-omit-frame-pointer -O3 -mtune=native "C:Program FilesMATLABR2019aexternversionfortran_mexapi_version.F" -o C:UsersuserAppDataLocalTempmex_62691295256641_4248fortran_mexapi_version.o


It seems like the mex-specific types like mwPointer defined in fintrf.h aren't being defined, even though I've included its location. Why are these types not recognized?






matlab fortran gfortran mex







share|improve this question














I'm trying to use MinGW gfortran with MATLAB R2019a on Windows 10 by writing a mexopts XML file based on existing XML files. I have cygwin installed with MinGW gcc, and I've been able to run mex -setup referencing the XML file successfully. When I try to compile the timestwo.F file to test the setup (using mex -R2018a timestwo.F90), I get a bunch of errors:



Building with 'cygwin MinGW64 Compiler (Fortran)'.
C:cygwin64binx86_64-w64-mingw32-gfortran -c -DMX_COMPAT_64 -DMATLAB_MEXCMD_RELEASE=R2018a -DUSE_MEX_CMD -I"C:Program FilesMATLABR2019aexterninclude" -I"C:Program FilesMATLABR2019asimulinkinclude" -I"C:Program FilesMATLABR2019aexternlibwin64mingw64" -fexceptions -fbackslash -fPIC -fno-omit-frame-pointer -O3 -mtune=native "C:cygwin64homeuserMATLABtimestwo.F90" -o C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o
f951: Warning: Nonexistent include directory ‘C:Program FilesMATLABR2019asimulinkinclude’ [-Wmissing-include-dirs]

C:cygwin64binx86_64-w64-mingw32-gfortran -c -DMX_COMPAT_64 -DMATLAB_MEXCMD_RELEASE=R2018a -DUSE_MEX_CMD -I"C:Program FilesMATLABR2019aexterninclude" -I"C:Program FilesMATLABR2019asimulinkinclude" -I"C:Program FilesMATLABR2019aexternlibwin64mingw64" -fexceptions -fbackslash -fPIC -fno-omit-frame-pointer -O3 -mtune=native "C:Program FilesMATLABR2019aexternversionfortran_mexapi_version.F" -o C:UsersuserAppDataLocalTempmex_62691295256641_4248fortran_mexapi_version.o
f951: Warning: Nonexistent include directory ‘C:Program FilesMATLABR2019asimulinkinclude’ [-Wmissing-include-dirs]

C:cygwin64binx86_64-w64-mingw32-gfortran -pthread -shared -O3 -mtune=native -Wl,--version-script,"C:Program FilesMATLABR2019aexternlibwin64mingw64fortran_exportsmexfileversion.map" C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o C:UsersuserAppDataLocalTempmex_62691295256641_4248fortran_mexapi_version.o -Wl,-L"C:Program FilesMATLABR2019aexternlibwin64mingw64" -llibmx -llibmex -llibmat -lm -L"C:cygwin64libgccx86_64-w64-mingw327.4.0" -lgfortran -o timestwo.mexw64
Error using mex
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0x47): undefined reference to
`mxisnumeric800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0x6a): undefined reference to
`mexerrmsgidandtxt800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0x72): undefined reference to
`mxgetdoubles800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0x7d): undefined reference to `mxgetm800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0x8c): undefined reference to `mxgetn800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0xa6): undefined reference to
`mxcopyptrtoreal8800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0xba): undefined reference to
`mxcreatedoublematrix800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0xc4): undefined reference to
`mxgetdoubles800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0xe5): undefined reference to
`mxcopyreal8toptr800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0x10d): undefined reference to
`mexerrmsgidandtxt800_'
C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o:timestwo.F90:(.text+0x13b): undefined reference to
`mexerrmsgidandtxt800_'
collect2: error: ld returned 1 exit status


Here's my source:



! Gateway routine
#include "fintrf.h"

subroutine mexFunction(nlhs, plhs, nrhs, prhs)
implicit none

mwPointer plhs(*), prhs(*)
integer nlhs, nrhs

! Declarations
mwPointer mxGetDoubles
mwPointer mxCreateDoubleMatrix
integer mxIsNumeric
mwPointer mxGetM, mxGetN

mwPointer x_ptr, y_ptr

mwPointer mrows, ncols
mwSize size

! Declare variables for computational routine
real*8 x_input, y_output

! Make sure input is valid
if(nrhs /= 1) then
 call mexErrMsgIdAndTxt ('MATLAB:timestwo:nInput', &
 'One input required.')
elseif(nlhs > 1) then
 call mexErrMsgIdAndTxt ('MATLAB:timestwo:nOutput', &
 'Too many output arguments.')
endif

if(mxIsNumeric(prhs(1)) == 0) then
 call mexErrMsgIdAndTxt ('MATLAB:timestwo:NonNumeric', &
 'Input must be a number.')
endif

! Read input array
x_ptr = mxGetDoubles(prhs(1))

! Get size of array
mrows = mxGetM(prhs(1))
ncols = mxGetN(prhs(1))
size = mrows*ncols

! Create a Fortran array from the input
call mxCopyPtrToReal8(x_ptr,x_input,size)

! Prepare a matrix for output
plhs(1) = mxCreateDoubleMatrix(mrows,ncols,0)

y_ptr = mxGetDoubles(plhs(1))

call timestwo(y_output, x_input)

! copy results to output argument
call mxCopyReal8ToPtr(y_output,y_ptr,size)

return
end

subroutine timestwo(y_output, x_input)
real*8 x_input, y_output

y_output = 2.0*x_input
return
end


The output is the same if I try with the included matlabrootexternexamplesrefbooktimestwo.F fixed-form version.



My options file details (first part of output from mex -v -R2018a timestwo.F90)



Compiler location: C:cygwin64
 Options file: C:UsersuserAppDataRoamingMathWorksMATLABR2019amex_FORTRAN_win64.xml
 CMDLINE2 : C:cygwin64binx86_64-w64-mingw32-gfortran -pthread -shared -O3 -mtune=native -Wl,--version-script,"C:Program FilesMATLABR2019aexternlibwin64mingw64fortran_exportsmexfileversion.map" C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o C:UsersuserAppDataLocalTempmex_62691295256641_4248fortran_mexapi_version.o -Wl,-L"C:Program FilesMATLABR2019aexternlibwin64mingw64" -llibmx -llibmex -llibmat -lm -L"C:cygwin64libgccx86_64-w64-mingw327.4.0" -lgfortran -o timestwo.mexw64
 FC : C:cygwin64binx86_64-w64-mingw32-gfortran
 DEFINES : -DMX_COMPAT_64 -DMATLAB_MEXCMD_RELEASE=R2018a -DUSE_MEX_CMD 
 FFLAGS : -fexceptions -fbackslash -fPIC -fno-omit-frame-pointer
 INCLUDE : -I"C:Program FilesMATLABR2019aexterninclude" -I"C:Program FilesMATLABR2019asimulinkinclude" -I"C:Program FilesMATLABR2019aexternlibwin64mingw64"
 FOPTIMFLAGS : -O3 -mtune=native
 FDEBUGFLAGS : -g -Wall
 LDF : C:cygwin64binx86_64-w64-mingw32-gfortran
 LDFLAGS : -pthread
 LDTYPE : -shared
 LINKEXPORT : -Wl,--version-script,"C:Program FilesMATLABR2019aexternlibwin64mingw64fexport.map"
 LINKEXPORTVER : -Wl,--version-script,"C:Program FilesMATLABR2019aexternlibwin64mingw64fortran_exportsmexfileversion.map"
 LINKLIBS : -Wl,-L"C:Program FilesMATLABR2019aexternlibwin64mingw64" -llibmx -llibmex -llibmat -lm -L"C:cygwin64libgccx86_64-w64-mingw327.4.0" -lgfortran
 LDOPTIMFLAGS : -O3 -mtune=native
 LDDEBUGFLAGS : -g -Wall
 OBJEXT : .o
 LDEXT : .mexw64
 SETENV : set COMPILER=C:cygwin64binx86_64-w64-mingw32-gfortran
 set COMPFLAGS=-fexceptions -fbackslash -fPIC -fno-omit-frame-pointer -DMX_COMPAT_64 -DMATLAB_MEXCMD_RELEASE=R2018a -DUSE_MEX_CMD 
 set OPTIMFLAGS=-O3 -mtune=native
 set DEBUGFLAGS=-g -Wall
 set LINKER=C:cygwin64binx86_64-w64-mingw32-gfortran
 set LINKFLAGS=-pthread
 set LINKDEBUGFLAGS=-pthread -shared -Wl,-L"C:Program FilesMATLABR2019aexternlibwin64mingw64" -llibmx -llibmex -llibmat -lm -L"C:cygwin64libgccx86_64-w64-mingw327.4.0" -lgfortran -Wl,--version-script,"C:Program FilesMATLABR2019aexternlibwin64mingw64fexport.map"
 set LDDEBUGFLAGS=-g -Wall
 set NAME_OUTPUT=-o "%OUTDIR%%MEX_NAME%%MEX_EXT%%"
 CYGWINROOT : C:cygwin64
 MATLABROOT : C:Program FilesMATLABR2019a
 ARCH : win64
 SRC : "C:cygwin64homeuserMATLABtimestwo.F90";"C:Program FilesMATLABR2019aexternversionfortran_mexapi_version.F"
 OBJ : C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o;C:UsersuserAppDataLocalTempmex_62691295256641_4248fortran_mexapi_version.o
 OBJS : C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o C:UsersuserAppDataLocalTempmex_62691295256641_4248fortran_mexapi_version.o 
 SRCROOT : C:cygwin64homeuserMATLABtimestwo
 DEF : C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.def
 EXP : "timestwo.exp"
 LIB : "timestwo.lib"
 EXE : timestwo.mexw64
 ILK : "timestwo.ilk"
 MANIFEST : "timestwo.mexw64.manifest"
 TEMPNAME : timestwo
 EXEDIR : 
 EXENAME : timestwo
 OPTIM : -O3 -mtune=native
 LINKOPTIM : -O3 -mtune=native
 CMDLINE1_0 : C:cygwin64binx86_64-w64-mingw32-gfortran -c -DMX_COMPAT_64 -DMATLAB_MEXCMD_RELEASE=R2018a -DUSE_MEX_CMD -I"C:Program FilesMATLABR2019aexterninclude" -I"C:Program FilesMATLABR2019asimulinkinclude" -I"C:Program FilesMATLABR2019aexternlibwin64mingw64" -fexceptions -fbackslash -fPIC -fno-omit-frame-pointer -O3 -mtune=native "C:cygwin64homeuserMATLABtimestwo.F90" -o C:UsersuserAppDataLocalTempmex_62691295256641_4248timestwo.o
 CMDLINE1_1 : C:cygwin64binx86_64-w64-mingw32-gfortran -c -DMX_COMPAT_64 -DMATLAB_MEXCMD_RELEASE=R2018a -DUSE_MEX_CMD -I"C:Program FilesMATLABR2019aexterninclude" -I"C:Program FilesMATLABR2019asimulinkinclude" -I"C:Program FilesMATLABR2019aexternlibwin64mingw64" -fexceptions -fbackslash -fPIC -fno-omit-frame-pointer -O3 -mtune=native "C:Program FilesMATLABR2019aexternversionfortran_mexapi_version.F" -o C:UsersuserAppDataLocalTempmex_62691295256641_4248fortran_mexapi_version.o


It seems like the mex-specific types like mwPointer defined in fintrf.h aren't being defined, even though I've included its location. Why are these types not recognized?






matlab fortran gfortran mex




matlab fortran gfortran mex






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asked Mar 28 at 20:54









zaenzaen

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  • 1





    Are you sure you should declare the MATLAB functions? mwPointer mxGetDoubles . Aren't those defined in the header file you include? These functions should likely be declared as extern C (or however you do that in Fortran), which would fix your capitalization issue.

    – Cris Luengo
    Apr 3 at 16:46











  • This is how MathWorks specifies the Fortran test file, so that was how I wrote my copy. mxGetDoubles is defined in the header file, but if I remove the declaration, I get Error: Function ‘mxgetdoubles800’ at (1) has no IMPLICIT type

    – zaen
    Apr 3 at 16:51











  • I see. Fortran is a weird language... :) -- Did you try compiling one of the demos that come with MATLAB? mex([matlabroot '/extern/examples/refbook/timestwo.F']).

    – Cris Luengo
    Apr 3 at 17:03











  • Yes, those fail as well. They succeed on Linux, and I think I've found the reason. The Linux libraries export symbols in a gfortran-compatible way, e.g. mxisnumeric800_. The underscore can be removed with -fno-underscoring, but the gfortran developers didn't include the -fsymbol-case-upper option from g77. That, I'm pretty sure, is the problem; gfortran forces symbols to be lowercase, while the Intel compiler goes for uppercase.

    – zaen
    Apr 3 at 17:10











  • Ah, that must be it. MATLAB supports the Intel Fortran compiler only on Windows.

    – Cris Luengo
    Apr 3 at 17:15












  • 1





    Are you sure you should declare the MATLAB functions? mwPointer mxGetDoubles . Aren't those defined in the header file you include? These functions should likely be declared as extern C (or however you do that in Fortran), which would fix your capitalization issue.

    – Cris Luengo
    Apr 3 at 16:46











  • This is how MathWorks specifies the Fortran test file, so that was how I wrote my copy. mxGetDoubles is defined in the header file, but if I remove the declaration, I get Error: Function ‘mxgetdoubles800’ at (1) has no IMPLICIT type

    – zaen
    Apr 3 at 16:51











  • I see. Fortran is a weird language... :) -- Did you try compiling one of the demos that come with MATLAB? mex([matlabroot '/extern/examples/refbook/timestwo.F']).

    – Cris Luengo
    Apr 3 at 17:03











  • Yes, those fail as well. They succeed on Linux, and I think I've found the reason. The Linux libraries export symbols in a gfortran-compatible way, e.g. mxisnumeric800_. The underscore can be removed with -fno-underscoring, but the gfortran developers didn't include the -fsymbol-case-upper option from g77. That, I'm pretty sure, is the problem; gfortran forces symbols to be lowercase, while the Intel compiler goes for uppercase.

    – zaen
    Apr 3 at 17:10











  • Ah, that must be it. MATLAB supports the Intel Fortran compiler only on Windows.

    – Cris Luengo
    Apr 3 at 17:15







1




1





Are you sure you should declare the MATLAB functions? mwPointer mxGetDoubles . Aren't those defined in the header file you include? These functions should likely be declared as extern C (or however you do that in Fortran), which would fix your capitalization issue.

– Cris Luengo
Apr 3 at 16:46





Are you sure you should declare the MATLAB functions? mwPointer mxGetDoubles . Aren't those defined in the header file you include? These functions should likely be declared as extern C (or however you do that in Fortran), which would fix your capitalization issue.

– Cris Luengo
Apr 3 at 16:46













This is how MathWorks specifies the Fortran test file, so that was how I wrote my copy. mxGetDoubles is defined in the header file, but if I remove the declaration, I get Error: Function ‘mxgetdoubles800’ at (1) has no IMPLICIT type

– zaen
Apr 3 at 16:51





This is how MathWorks specifies the Fortran test file, so that was how I wrote my copy. mxGetDoubles is defined in the header file, but if I remove the declaration, I get Error: Function ‘mxgetdoubles800’ at (1) has no IMPLICIT type

– zaen
Apr 3 at 16:51













I see. Fortran is a weird language... :) -- Did you try compiling one of the demos that come with MATLAB? mex([matlabroot '/extern/examples/refbook/timestwo.F']).

– Cris Luengo
Apr 3 at 17:03





I see. Fortran is a weird language... :) -- Did you try compiling one of the demos that come with MATLAB? mex([matlabroot '/extern/examples/refbook/timestwo.F']).

– Cris Luengo
Apr 3 at 17:03













Yes, those fail as well. They succeed on Linux, and I think I've found the reason. The Linux libraries export symbols in a gfortran-compatible way, e.g. mxisnumeric800_. The underscore can be removed with -fno-underscoring, but the gfortran developers didn't include the -fsymbol-case-upper option from g77. That, I'm pretty sure, is the problem; gfortran forces symbols to be lowercase, while the Intel compiler goes for uppercase.

– zaen
Apr 3 at 17:10





Yes, those fail as well. They succeed on Linux, and I think I've found the reason. The Linux libraries export symbols in a gfortran-compatible way, e.g. mxisnumeric800_. The underscore can be removed with -fno-underscoring, but the gfortran developers didn't include the -fsymbol-case-upper option from g77. That, I'm pretty sure, is the problem; gfortran forces symbols to be lowercase, while the Intel compiler goes for uppercase.

– zaen
Apr 3 at 17:10













Ah, that must be it. MATLAB supports the Intel Fortran compiler only on Windows.

– Cris Luengo
Apr 3 at 17:15





Ah, that must be it. MATLAB supports the Intel Fortran compiler only on Windows.

– Cris Luengo
Apr 3 at 17:15












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