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250720.083302.PDT update the comment of the bug of MATLAB R2025a
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‎matlab/mex_gateways/R2025a/README.txt‎

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This directory contains temporary MEX gateway to circumvent the MATLAB R2025a bug that it segfaults
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when the Fortran MEX function contains an internal procedure that is passed as an actual argument.
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on Linux if the Fortran MEX function contains an internal procedure that is passed as an actual argument.
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The MEX files use a module variable to store the function handle, which is essentially a
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global variable and is not thread-safe or recursion-safe.

‎matlab/mex_gateways/R2025a/bobyqa_mex.F90‎

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!--------------------------------------------------------------------------------------------------!
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! The MEX gateway for BOBYQA
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! This is a temporary MEX gateway to circumvent the MATLAB R2025a bug that it segfaults when
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! the Fortran MEX function contains an internal procedure that is passed as an actual argument.
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! This is a temporary MEX gateway to circumvent the MATLAB R2025a bug that it segfaults on Linux
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! if the Fortran MEX function contains an internal procedure that is passed as an actual argument.
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! This MEX uses a module variable FUN_PTR to store the function handle, which is essentially a
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! global variable and is not thread-safe or recursion-safe.
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! See MathWorks Technical Support Case 07931486 and
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!
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! Started in July 2020
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!
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! Last Modified: Sat 19 Jul 2025 11:34:45 PM PDT
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! Last Modified: Sun 20 Jul 2025 08:30:42 AM PDT
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!--------------------------------------------------------------------------------------------------!
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#include "fintrf.h"

‎matlab/mex_gateways/R2025a/cobyla_mex.F90‎

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!--------------------------------------------------------------------------------------------------!
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! The MEX gateway for COBYLA
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! This is a temporary MEX gateway to circumvent the MATLAB R2025a bug that it segfaults when
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! the Fortran MEX function contains an internal procedure that is passed as an actual argument.
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! This is a temporary MEX gateway to circumvent the MATLAB R2025a bug that it segfaults on Linux
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! if the Fortran MEX function contains an internal procedure that is passed as an actual argument.
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! This MEX uses a module variable FUN_PTR to store the function handle, which is essentially a
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! global variable and is not thread-safe or recursion-safe.
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! See MathWorks Technical Support Case 07931486 and
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!
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! Started in July 2020
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!
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! Last Modified: Sat 19 Jul 2025 11:40:45 PM PDT
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! Last Modified: Sun 20 Jul 2025 08:30:57 AM PDT
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!--------------------------------------------------------------------------------------------------!
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#include "fintrf.h"

‎matlab/mex_gateways/R2025a/cobylb.f90‎

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! This is a temporary version of cobylb.f90 to circumvent the MATLAB R2025a bug that it segfaults when
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! the Fortran MEX function contains an internal procedure that is passed as an actual argument.
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! This is a temporary version of cobylb.f90 to circumvent the MATLAB R2025a bug that it segfaults on
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! Linux if the Fortran MEX function contains an internal procedure that is passed as an actual argument.
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! This MEX uses a module variable FUN_PTR to store the function handle, which is essentially a
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! global variable and is not thread-safe or recursion-safe.
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! See MathWorks Technical Support Case 07931486 and
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!
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! Started: July 2021
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!
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! Last Modified: Sun 20 Jul 2025 01:14:30 AM PDT
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! Last Modified: Sun 20 Jul 2025 08:31:19 AM PDT
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!--------------------------------------------------------------------------------------------------!
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implicit none

‎matlab/mex_gateways/R2025a/lincoa_mex.F90‎

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!--------------------------------------------------------------------------------------------------!
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! The MEX gateway for LINCOA
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! This is a temporary MEX gateway to circumvent the MATLAB R2025a bug that it segfaults when
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! the Fortran MEX function contains an internal procedure that is passed as an actual argument.
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! This is a temporary MEX gateway to circumvent the MATLAB R2025a bug that it segfaults on Linux
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! if the Fortran MEX function contains an internal procedure that is passed as an actual argument.
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! This MEX uses a module variable FUN_PTR to store the function handle, which is essentially a
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! global variable and is not thread-safe or recursion-safe.
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! See MathWorks Technical Support Case 07931486 and
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!
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! Started in July 2020
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!
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! Last Modified: Sat 19 Jul 2025 11:36:09 PM PDT
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! Last Modified: Sun 20 Jul 2025 08:31:41 AM PDT
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!--------------------------------------------------------------------------------------------------!
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#include "fintrf.h"

‎matlab/mex_gateways/R2025a/newuoa_mex.F90‎

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!--------------------------------------------------------------------------------------------------!
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! The MEX gateway for NEWUOA
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! This is a temporary MEX gateway to circumvent the MATLAB R2025a bug that it segfaults when
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! the Fortran MEX function contains an internal procedure that is passed as an actual argument.
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! This is a temporary MEX gateway to circumvent the MATLAB R2025a bug that it segfaults on Linux
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! if the Fortran MEX function contains an internal procedure that is passed as an actual argument.
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! This MEX uses a module variable FUN_PTR to store the function handle, which is essentially a
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! global variable and is not thread-safe or recursion-safe.
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! See MathWorks Technical Support Case 07931486 and
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!
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! Started in July 2020
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!
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! Last Modified: Sat 19 Jul 2025 11:34:27 PM PDT
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! Last Modified: Sun 20 Jul 2025 08:32:00 AM PDT
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!--------------------------------------------------------------------------------------------------!
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#include "fintrf.h"

‎matlab/mex_gateways/R2025a/uobyqa_mex.F90‎

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!--------------------------------------------------------------------------------------------------!
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! The MEX gateway for UOBYQA
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! This is a temporary MEX gateway to circumvent the MATLAB R2025a bug that it segfaults when
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! the Fortran MEX function contains an internal procedure that is passed as an actual argument.
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! This is a temporary MEX gateway to circumvent the MATLAB R2025a bug that it segfaults on Linux
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! if the Fortran MEX function contains an internal procedure that is passed as an actual argument.
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! This MEX uses a module variable FUN_PTR to store the function handle, which is essentially a
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! global variable and is not thread-safe or recursion-safe.
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! See MathWorks Technical Support Case 07931486 and
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!
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! Started in July 2020
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!
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! Last Modified: Sat 19 Jul 2025 11:34:10 PM PDT
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! Last Modified: Sun 20 Jul 2025 08:32:14 AM PDT
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!--------------------------------------------------------------------------------------------------!
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#include "fintrf.h"

‎matlab/setup_tools/compile.m‎

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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% Zaikun 20250720:
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% The following code is to circumvent a bug in MATLAB R2025a, which segfaults when the Fortran
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% files contain internal procedures that are passed as actual arguments to other procedures.
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% The following code is to circumvent a bug in MATLAB R2025a, which segfaults on Linux when the
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% Fortran files contain internal procedures that are passed as actual arguments to other procedures.
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% To avoid this bug, we replace gateways/*_mex.F90 with gateways/R2025a/*_mex.F90, and
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% fortran/cobylb.f90 with gateways/R2025a/cobylb.f90, which uses module variables instead of
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% internal procedures. The price is that PRIMA becomes thread-unsafe and recursion-unsafe.
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% https://fortran-lang.discourse.group/t/implementation-of-a-parametrized-objective-function-without-using-module-variables-or-internal-subroutines
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% https://stackoverflow.com/questions/79705107/fortran-implementating-a-parametrized-objective-function-without-using-module-v
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if verLessThan('matlab', '25.2') && ~verLessThan('matlab', '25.1') % The version number of R2025a is 25.1.
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if isunix && ~ismac && verLessThan('matlab', '25.2') && ~verLessThan('matlab', '25.1') % The version number of R2025a is 25.1.
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if verbose
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warning('prima:ThreadRecursionUnsafe', ...
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['MATLAB R2025a has a bug that causes segmentation faults when handling Fortran MEX files with internal procedures.\n', ...

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