Objective-C++ support might need a look, doesn't seem to be compiling

[dreamer-coding-555]

Describe the bug
Followed the general steps to setup the environment for working with Objective-C++ GNUStep and Objective-c compiler just in case, try to build but I get the following:

This screenshot is from one of my GitHub actions which tests each version of Meson starting from 1.0.0 to the latest which in this case is 1.4.0 and they seem to yield the same result:

To Reproduce
Repository in question: also tried to match the samples in test cases but doesn't seem to be much covering Objective-C++ unless I'm overlooking something.
https://github.com/dreamer-coding-555/meson-lib-objcpp

Expected behavior
I expect this to compile similar to Objective-C

system parameters

• Is this a cross build or just a plain native build (for the same computer)? native build
• what operating system Ubuntu 20.04
• what python 3.13.0
• what meson 1.0.0
• what ninja 1.11.1