[build] Building with Zig fails with undeclared identifier 'MAX_FILEPATH_LENGTH'

[cryptocode]

Issue description

I'm trying to use raylib master branch as a dependency in a Zig project, but running into an error.

To repro, clone master branch and build directly with Zig 0.15.2 (my repro was done on macOS):

zig build

Output:

raylib/src/rmodels.c:4313:21: error: use of undeclared identifier 'MAX_FILEPATH_LENGTH'
    char currentDir[MAX_FILEPATH_LENGTH] = { 0 };
                    ^
raylib/src/rmodels.c:4314:48: error: use of undeclared identifier 'MAX_FILEPATH_LENGTH'
    strncpy(currentDir, GetWorkingDirectory(), MAX_FILEPATH_LENGTH - 1); // Save current working directory

Environment

macOS aarch64, Zig 0.15.2

[raysan5]

@cryptocode Are you defining EXTERNAL_CONFIG_FLAGS? MAX_FILEPATH_LENGTH is defined by config.h that is included by rmodels.c at the beginning:

#if !defined(EXTERNAL_CONFIG_FLAGS)
    #include "config.h"     // Defines module configuration flags
#endif

[cryptocode]

I am not defining EXTERNAL_CONFIG_FLAGS. Just tried on Linux as well - all I did to repro was clone this repo and run zig build.

I bisected this to 2a56654 - building works fine on commits before that. I guess it's because that commit introduces a usage of MAX_FILEPATH_LENGTH

[raysan5]

@cryptocode yes, I added it yesterday but it works for all platforms in C, there should be some issue with Zig build system...

[olaron]

EXTERNAL_CONFIG_FLAGS seems to always be defined when building with zig because of this change : fixed platform change for zig build file #4531
This was probably a mistake that had no consequence at the time ? Or was this by design in some way ?
In any case, moving the try raylib_flags_arr.append("-DEXTERNAL_CONFIG_FLAGS"); line inside this if (options.config.len > 0) { seems to fix the issue for me.

[raysan5]

@olaron Please, could you send a PR with the fix? Thanks!