LONG_MAX is different for Windows 64 and Linux 64

When you generate code with Simulink (MATLAB R2023b) using ert.tlc, the default OS is Windows 64, see Configuration Parameters - Hardware Implementation - Device type. When you generate C code, the <model name>_private.h file will contain checks for ULONG_MAX and LONG_MAX.

On 64-bit Windows, the long type is typically 32 bits, which causes the LONG_MAX to be 0x7FFFFFFF. On 64-bit Linux systems, the long type is typically 64 bits, i.e. LONG_MAX is 0x7FFFFFFFFFFFFFFF. When you use code generated with the Windows 64 setting and use that on a Linux 64 OS, the check in <model name>_private.h will fail. The solution is to use the Linux 64 setting in Simulink which removes the LONG_MAX check from header file.

This checks seem to have been added after MATLAB R2022b because code generated with R2022b does not have them.