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cmatlabgccgnumex
tej mohan
tej mohan

Reputation: 37

unable to compile C files (MEX) in matlab (Windows) using GNU GCC

I am trying to compile native linux c files on windows using GNU GCC compilers. For the installation purpose, I have followed the steps mentioned by Faheem in the following link :

Using GCC(minGW) as Matlab's MEX compiler

the example given there compiled successfully. but when i am trying to compile a file using thread functions, the following error is being thrown:

fatal error: pthread.h: No such file or directory #include ^ compilation terminated.

I have installed all the components from MinGW installer related to GNU C compiler bu still the error persists. Can any one suggest a way to solve this problem. Thanks in advance.

Upvotes: 4

Views: 1352

Answers (1)

chappjc
chappjc

Reputation: 30579

According to the TDM-GCC "Quircks" page, TDM-GCC includes a pthreads emulation layer for Microsoft Windows systems, called "winpthreads", and a recent toolchain you should have x86_64-w64-mingw32\include\pthread.h in the TDM install path. So, I don't know what is wrong with Faheem's instructions, but you should have no trouble including pthread.h if MATLAB is configured correctly.

What is not stated on the TDM Quircks page is that TDM uses Winpthreads from the MinGW-w64 project. From the current README installed with TDM:

"Winpthreads" is one of the libraries distributed by the MinGW-w64 project, and it allows GCC to be compiled with full pthreads compatibility, which is necessary to enable std::thread and other threading related functions in the C++ runtime.

As it states, Pthreads is part of the MinGW-w64 project and you can also get it with MinGW-w64 if you pick a pthreads enabled toolchain. For MinGW-w64, I do the following to set it up (see here for more details):

  1. Grab the latest revision for w64 from Sourceforge (or use the installer to choose the toolchain you want, picking a pthread version).
  2. Extract it so that you have a path to the compiler like C:\mingw-w64\x86_64-4.9.2-release-posix-seh-rt_v3-rev1\bin\x86_64-w64-mingw32-g++.exe. There is no need for MSYS, cygwin, or any other environment if you plan on compiling in MATLAB with mex.

  3. Set it up with a custom mexopts.bat or using the new xml configuration system. On my GitHub repo, I have C++ configurations for MinGW-w64 in both file types: mingw_mexopts.bat and mex_C++_mingw-w64.xml. For example, using the xml file to set up C++ MEX file compilation:

    mex -setup:C:\Users\Jon\Documents\MATLAB\mex_C++_mingw-w64.xml C++

    If needed, set up the C compiler in a similar manner by modifying the config files.

I posted a more detailed version of the above instructions in my answer to the canonical question on the MinGW-with-MATLAB topic.

Upvotes: 1

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