build: support meson build system

[mochaaP]

CMake feature parity:

• Export meson target
• Export meson c++20 modules target
• Export cmake target
• Installing headers
• Googletest support
• Freestanding tests
• Modules tests
• Google Benchmark support
• Extract examples from docs

Extra features:

• Export pkgconfig target
• clang-format support
• Make fmtlib optional when building examples
• Install documents to docdir

Tested on Fedora Linux 44 (gcc/clang/msvc-wine + ninja) and Windows 10 22H2 (msvc + vs2022).

[mochaaP]

@microsoft-github-policy-service agree

[mingxwa]

Thank you for the contribution! Adding Meson support is a great addition to make the library more accessible. However, I have some concerns regarding the maintenance of the build files and the CI configuration.

[mochaaP]

Thank you for the extensive review. I will work on the changes later.

[Copilot]

Pull request overview

This PR adds comprehensive Meson build system support to the project alongside the existing CMake setup. The implementation includes building the library, tests, benchmarks, and extracting examples from documentation, with support for C++20 modules and various compiler configurations.

Key changes:

• Complete Meson build configuration with feature parity to CMake (modules, tests, benchmarks, examples)
• Python automation scripts for test/benchmark discovery and documentation example extraction
• GitHub Actions CI workflow for testing Meson builds across multiple platforms and compilers

Reviewed changes

Copilot reviewed 22 out of 23 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
meson.build	Main build configuration defining project metadata, compiler checks, dependencies, and library targets
meson.options	Build options for enabling/disabling tests, benchmarks, examples, modules, and freestanding support
meson.format	Code formatting configuration for Meson files
tools/meson_extract_doctest.py	Script to extract C++ code examples from markdown documentation
tools/meson_autogen_tests.py	Script to auto-generate test case lists from GTest JSON output
tools/meson_autogen_doctest.py	Script to auto-generate documentation example file lists
tools/meson_autogen_benchmarks.py	Script to auto-generate benchmark suite definitions
tools/meson.build	Build configuration to locate Python automation scripts
tools/extract_example_code_from_docs.py	Refactored script with type hints and improved structure for extracting code examples
tests/meson.build	Test suite configuration including standard, freestanding, and module tests
tests/modules/meson.build	C++20 modules-specific test configuration
benchmarks/meson.build	Benchmark suite configuration
docs/meson.build	Configuration for building and testing documentation examples
docs/example.cpp.in	Template file for generated example code
subprojects/*.wrap	Meson wrap files for external dependencies (googletest, google-benchmark, fmt)
tests/proxy_reflection_tests.cpp	Fixed test using more accurate type trait combination
include/proxy/v4/proxy_fmt.h	Added fmt v12+ compatibility check for wchar_t support
.github/workflows/meson.yml	CI workflow for testing Meson builds with various compilers and configurations
.github/workflows/pipeline-ci.yml	Updated main CI pipeline to include Meson workflow
.github/workflows/pipeline-release.yml	Fixed tar command argument ordering in release script
.gitignore	Added Meson build artifacts and Python cache to ignore list

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Module issues can be resolved in a separate PR

[mochaaP]

Modules support is soon OOTB on meson, I'm working on it upstream

edit:
Soon™
need more time cooking to make it good and correct.