Mex compilation with header files

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Sumeet
Sumeet 2013-1-15
评论： Letian Wang 2015-1-29
Hi,
I'm running Matlab on Ubuntu 12.04. I have written a C++ function simulation.cpp using the mex format. I've defined some of my functions in a separate header file that is located in the same directory as simulation.cpp. I read on the web that to compile a .cpp file with header files, I need to use -l and provide the path of the header files. When I run the following:
mex -l"/media/.../folder_containing_header_files" simulation.cpp
I get the following error
/usr/bin/ld: cannot find -l/media/.../folder_containing_header_files/
collect2: ld returned 1 exit status
mex: link of ' "simulation.mexglx"' failed.
Incidentally, all my header files are located in the same directory as simulation.cpp, which is also my working directory in matlab.
Does anybody know what the problem is?
Thanks!

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回答（5 个）

Sumeet
Sumeet 2013-1-17
Thank You all for your help.
James: I do have all my header files in one folder. When I tried without the -I as you suggested, I was getting an undefined reference error for all functions declared in my header file and defined in a separate cpp file (with the same name as the header file). Some web-searching revealed that I shouldn't be doing just
mex simulation.cpp
but instead
mex simulation.cpp header.cpp
This worked. Sorry if this is well-known, I wasn't aware of this - I don't have a CS or compilers background.
Thanks again James, Walter and Ryan!
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Letian Wang
Letian Wang 2015-1-29
Hi, I am also having this problem. But I did have a header.hpp file, and it could not be recognized by matlab.
So how can you make it? turn it into cpp file?
Thank you for sharing!

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Walter Roberson
Walter Roberson 2013-1-15
You used the "-l" (lower-case L) option; you need to use "-I" (upper-case I). "I" for "include".
Also you might need to use a space between the option and its value.
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Sumeet
Sumeet 2013-1-15
编辑：Sumeet 2013-1-15
Thanks again Walter. Yes, -I (I for include) was the problem. However, now it cannot find mex.h. Where is it located and how do I specify its location to matlab?
>> mex -I "./" simulation.cpp
Warning: You are using gcc version "4.6.3-1ubuntu5)". The version
currently supported with MEX is "4.4.6".
For a list of currently supported compilers see:
http://www.mathworks.com/support/compilers/current_release/
simulation.cpp:2:17: fatal error: mex.h: No such file or directory
compilation terminated.
mex: compile of ' "simulation.cpp"' failed.
Error using mex (line 206)
Unable to complete successfully.

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James Tursa
James Tursa 2013-1-15
If your current directly is the directory that contains simulation.cpp and its associated header files, doesn't simply "mex simulation.cpp" work at the command line?
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Sumeet
Sumeet 2013-1-15
Thanks James and Walter. I tried both `<HeaderFile.hpp> and "HeaderFile.hpp". It didn't help.
Walter Roberson
Walter Roberson 2013-1-15
Are you still using -l (lower-case L)? I'm sure it should be -I (upper-case I)

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James Tursa
James Tursa 2013-1-15
编辑：James Tursa 2013-1-15
Have you tried the function form of mex yet? I.e., something like
mex('-I','...whatever...','simulation.cpp')
Also, what do your include lines in the actual source code look like?
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James Tursa
James Tursa 2013-1-17
编辑：James Tursa 2013-1-17
Frankly, I don't know for sure since I don't personally use any of these library/include/directory options myself. Things like having spaces in directory names etc tend to complicate things, so I avoid these options entirely. But I have never had a problem with the following approach:
- Have all the source and header files in one directory
- Make that directory the current directory
- Use simple #include "filename.h" syntax in source files
- Use filenames without directory info on the mex command line
Does this approach work for you?
Walter Roberson
Walter Roberson 2013-1-17
If you were to try
mex -v gateway.c
then along the way it would probably indicate which directories it is -I'ing; you could then -I those directories for your actual code.

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Ryan Livingston
Ryan Livingston 2013-1-17
There should be no space between the switch and the directory. So can you try:
mex -I./ gateway.c
rather than
mex -I "./" gateway.c

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