CPP language should include .m and .mm file extensions for Objective-C/Objective-C++ support

[freelf]

Problem

The cpp language's FilenameMatcher in solidlsp/ls_config.py only matches C/C++ extensions:

case self.CPP | self.CPP_CCLS:
    return FilenameMatcher("*.cpp", "*.h", "*.hpp", "*.c", "*.hxx", "*.cc", "*.cxx")

This means .m (Objective-C) and .mm (Objective-C++) files are not associated with clangd, even though clangd fully supports these file types.

Currently .m is mapped to MATLAB, which makes Objective-C source files inaccessible through the cpp language server.

Impact

For iOS/macOS projects, get_symbols_overview, find_symbol, and find_referencing_symbols all fail on .m and .mm files with:

ValueError - Cannot extract symbols from file xxx.m. Active languages: ['cpp']

While .h header files work fine (since they match *.h), the implementation files are completely excluded.

Suggested Fix

Add "*.m" and "*.mm" to the CPP FilenameMatcher:

case self.CPP | self.CPP_CCLS:
    return FilenameMatcher("*.cpp", "*.h", "*.hpp", "*.c", "*.hxx", "*.cc", "*.cxx", "*.m", "*.mm")

Note: *.m currently conflicts with MATLAB. A possible solution is to either:

1. Add .m/.mm to cpp and remove .m from MATLAB (breaking change for MATLAB users)
2. Allow configurable file extension overrides via ls_specific_settings
3. Add a dedicated objc language alias that maps to clangd with ObjC extensions

Environment

• Serena version: 0.1.4
• Platform: macOS (ARM64)
• Use case: Cross-platform mobile SDK with C++, Objective-C++, and Kotlin code

[MischaPanch]

Thx for reporting, @opcode81 and I will discuss how to best handle overlapping file extensions.

Add a dedicated objc language alias that maps to clangd with ObjC extensions

As to this, could you elaborate what would be needed to enable ObjC extensions in Serena's clangd support? Does it also work with ccls?

[freelf]

Thx for reporting, @opcode81 and I will discuss how to best handle overlapping file extensions.

Add a dedicated objc language alias that maps to clangd with ObjC extensions

As to this, could you elaborate what would be needed to enable ObjC extensions in Serena's clangd support? Does it also work with ccls?

yeah, it's work fine

[MischaPanch]

ObjC works fine with both ccls and clangd without any modification in serena code? Just to make sure I understand you correctly

[freelf]

ObjC works fine with both ccls and clangd without any modification in serena code? Just to make sure I understand you correctly

yes,that's correctly

[MischaPanch]

Related to #1178