Support language-specific compiler macros in clangd configuration

[brondani]

Fixes

• compile_macros.h ignores configured language standard #335
• [Bug]: compile_macros.h causes many false errors from clangd for C++ codes cmsis-toolbox#625

Aligns

• Refactor preprocessing arguments across toolchain configs devtools#2530
• Generate language-specific compile macro files cbuild2cmake#503

Changes

• Detect separate compile_macros_c.h and compile_macros_cxx.h files and add language-specific .clangd sections for available headers. Legacy compile_macros.h output is no longer supported.
• Simplify .clangd content regeneration to avoid outdated fragments.
• Keep the compilation database configuration in the generated .clangd file without relying on setContext.
• Avoid applying generated macro headers to CLANG contexts.
• Update unit tests to parse the generated YAML and verify language-specific macros and compilation database settings.

This supports build output that provides separate C and C++ compiler macro headers, ensuring clangd applies the appropriate macros for each language.

Path matching remains file extension-based according to Filename Extensions.

Screenshots

N/A — no UI changes.

Checklist

• 🤖 This change is covered by unit tests (if applicable).
• 🤹 Manual testing has been performed (if necessary).
• 🛡️ Security impacts have been considered (if relevant).
• 📖 Documentation updates are complete (not required).
• 🧠 Third-party dependencies and TPIP updated (not required).

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Scanned Files

None

[qltysh]

Coverage Impact

⬆️ Merging this pull request will increase total coverage on main by 0.06%.

Modified Files with Diff Coverage (1)

Rating	File	% Diff	Uncovered Line #s
	src/solutions/clangd-manager.ts	92.3%	367-373
	Total	92.3%

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In the `support-language-specific-compiler` branch, add test coverage for this new code:

- `src/solutions/clangd-manager.ts` -- Line 367-373

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[Copilot]

Pull request overview

This PR updates the extension’s clangd configuration generation to support language-specific compiler macro headers (compile_macros_c.h / compile_macros_cxx.h) and to persist compilation database settings directly in generated project .clangd files rather than relying on setContext.

Changes:

• Detect C vs C++ macro header outputs and generate language-specific .clangd fragments guarded by If: PathMatch.
• Keep CompileFlags.CompilationDatabase set in generated .clangd fragments (and avoid applying macro headers for CLANG compiler contexts).
• Update unit tests to parse the generated YAML and validate fragment structure/content.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/solutions/clangd-manager.ts	Generates project .clangd fragments with language-specific -include headers and sets CompilationDatabase directly.
src/solutions/clangd-manager.test.ts	Updates tests to assert YAML fragment structure and validate C/C++ macro fragment generation behavior.

[edriouk]

LGTM