Introduction

This repository contains a set of scripts that test the behavior of MATLAB, sometimes illustrate its bugs.

• test_parfor illustrates a bug of MATLAB R2023a+ concerning parfor [README].

• segfault_2025a illustrates a bug in MATLAB R2025a MEX when handling internal subroutines in Fortran. [README]

• crash illustrates a bug of the Linux version of MATLAB (up to R2023b) concerning MEX. [README]

• test_compiler tests which versions of gfortran are supported by MATLAB to mexify Fortran code; the result differs from the (initial) official documentation of MathWorks; particularly, MATLAB R2022a does not support gfortran 8.x as claimed.

• test_copyfile illustrates a bug of MATLAB (up to R2023b) concerning copyfile on Linux and macOS.

• test_mac shows that the MEX of MATLAB R2023b (update 6 as of February 15, 2024) does not work with Xcode 15 and Intel oneAPI 2023. This differs from the official documentation.

• mex_time tests the running time of MATLAB concerning MEX, in particular on GitHub Actions. [README]

Discussions

• StackOverflow: An issue with parfor in MATLAB R2023a--R2025a

• MATLAB Answer: An issue with parfor in MATLAB R2023a--R2025a

• StackOverflow: Does MEX of MATLAB R2023b (update 6) on macOS-13 work with Xcode 15.0 and Intel oneAPI 2023?

• MATLAB Answer: Does MEX of MATLAB R2023b (update 6) on macOS-13 work with Xcode 15.0 and Intel oneAPI 2023?

• GitHub issue of matlab-actions/setup-matlab: MEX of MATLAB R2023b provided by setup-matlab@v2 does not work with Xcode 15.0 and Intel oneAPI 2023

• StackOverflow: Strange behavior of copyfile regarding symlinks on Linux and macOS

• MATLAB Answer: Strange behavior of copyfile regarding symlinks on Linux and macOS

• GitHub issue of matlab-actions/setup-matlab: MATLAB R2022a: MEX does not support the Fortran compilers specified in the official documentation

• StackOverflow: Does MATLAB R2022a support gfortran 8.x on Linux (as specified by the documentation)?

• MATLAB Answer: MATLAB R2022a: MEX does not support the Fortran compilers on Linux as specified in the official documentation

• GitHub issue of matlab-actions/setup-matlab: MEX is much slower on macOS than on Linux

• StackOverflow: Is MEX of MATLAB known to be slow on macOS?

• MATLAB Answers: Is MEX known to be slow on macOS?

• GitHub issue of matlab-actions/setup-matlab: MATLAB crashes when mexifying the official timestwo.F

• MATLAB Answers: Bug: MATLAB crashes when mexifying the official timestwo.c

• StackOverflow: Bug of MATLAB 2025a: segfaults on Ubuntu when handling Fortran MEX files with internal subroutines

• MATLAB Answers: Bug: MATLAB 2025a segfaults on Ubuntu when handling Fortran MEX files with internal subroutines

Contact

Feel free to contact me if have suggestions or questions. See my homepage for contact information.