meson: Add a Meson based build system

This is primarily intended to be useful for projects using Meson wishing to consume cxxopts as a subproject. By hosting the files upstream users get the benefit of automatic parity with the CMake based install provided by an OS vendor or distribution. The implementation attempts to mirror the CMake build as much as possible, with the exception of generating the cmake-config files, which Meson doesn't currently support. It uses a small python script to parse the cxxopts.hpp header to extract the version, due to a concious design decision of Meson to leave such complex logic to external scripting languages like Python.
2024-03-04 15:48:42 -08:00 · 2024-03-04 15:48:42 -08:00 · ef3cf0876d
parent c01a048d88
commit ef3cf0876d
4 changed files with 240 additions and 0 deletions
--- a/meson.build
+++ b/meson.build
@ -0,0 +1,97 @@
+# Copyright © 2024-2026 Dylan Baker
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+project(
+  'cxxopts',
+  'cpp',
+  version : run_command(
+    'meson/version.py', files('include/cxxopts.hpp'), capture : true, check : true).stdout().strip(),
+  meson_version : '>= 0.64',
+  license : 'MIT',
+  default_options : ['cpp_std=c++11', 'warning_level=2'],
+)
+
+cpp = meson.get_compiler('cpp')
+
+with_warnings = get_option('warnings').disable_auto_if(meson.is_subproject()).allowed()
+if with_warnings
+  add_project_arguments(
+    cpp.get_supported_arguments(
+      '-Wsuggest-override',
+      '-Wshadow',
+      '-Weffc++',
+      '-Wsign-compare',
+      '-Wshadow',
+      '-Wwrite-strings',
+      '-Wpointer-arith',
+      '-Winit-self',
+      '-Wconversion',
+      '-Wno-sign-conversion',
+    ),
+    language : 'cpp',
+  )
+endif
+
+install_headers('include/cxxopts.hpp')
+
+dep_icu = dependency('icu-uc', required : get_option('icu'))
+if dep_icu.found()
+  add_project_arguments('-DCXXOPTS_USE_UNICODE', language : 'cpp')
+endif
+
+with_examples = get_option('examples').disable_auto_if(meson.is_subproject()).allowed()
+if with_examples
+  executable(
+    'example',
+    'src/example.cpp',
+    include_directories : 'include',
+    dependencies : dep_icu,
+    override_options : ['cpp_std=c++17'],
+  )
+endif
+
+with_tests = get_option('tests').disable_auto_if(meson.is_subproject()).allowed()
+if with_tests
+  subdir('test')
+endif
+
+extra_cflags = []
+if dep_icu.found()
+  extra_cflags += ['-DCXXOPTS_USE_UNICODE']
+endif
+
+dep_cxxopts = declare_dependency(
+  include_directories : 'include',
+  dependencies : dep_icu,
+  compile_args : extra_cflags,
+)
+
+meson.override_dependency('cxxopts', dep_cxxopts)
+
+pkg = import('pkgconfig')
+
+pkg.generate(
+  name : 'cxxopts',
+  description : 'A header-only lightweight C++ command line option parser',
+  url : 'https://github.com/jarro2783/cxxopts',
+  extra_cflags : extra_cflags,
+  requires : dep_icu,
+  dataonly : not dep_icu.found(),
+)
--- a/meson/version.py
+++ b/meson/version.py
@ -0,0 +1,47 @@
+#!/usr/bin/env python
+# Copyright © 2024-2026 Dylan Baker
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+"""Parse the cxxopts.hpp header to get the version."""
+
+import sys
+
+def main():
+    versions = [None, None, None]
+    with open(sys.argv[1], 'r', encoding='ascii') as f:
+        for line in f:
+            if line.startswith('#define CXXOPTS__VERSION_'):
+                ver = line.rstrip().rsplit(' ', 1)[-1]
+                if 'MAJOR' in line:
+                    versions[0] = ver
+                elif 'MINOR' in line:
+                    versions[1] = ver
+                elif 'PATCH' in line:
+                    versions[2] = ver
+                if None not in versions:
+                    break
+
+    assert None not in versions, \
+        "Did not find all of the expected version strings in cxxopts.hpp"
+    print('.'.join(versions))
+
+
+if __name__ == "__main__":
+    main()
--- a/meson_options.txt
+++ b/meson_options.txt
@ -0,0 +1,41 @@
+# Copyright © 2024-2026 Dylan Baker
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+option(
+  'examples',
+  type : 'feature',
+  description : 'Whether to build examples. Defaults to enabled when not built as a subproject, otherwise disabled.',
+)
+option(
+  'tests',
+  type : 'feature',
+  description : 'Whether to build tests. Defaults to enabled when not built as a subproject, otherwise disabled.',
+)
+option(
+  'warnings',
+  type : 'feature',
+  description : 'Whether to add additional warnings. Defaults to enabled when not built as a subproject, otherwise disabled.',
+)
+option(
+  'icu',
+  type : 'feature',
+  value : 'disabled',
+  description : 'use ICU Unicode library.',
+)
--- a/test/meson.build
+++ b/test/meson.build
@ -0,0 +1,55 @@
+# Copyright © 2024-2026 Dylan Baker
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+inc = include_directories('../include')
+
+test(
+  'link',
+  executable(
+    'link_test',
+    'link_a.cpp', 'link_b.cpp',
+    dependencies : dep_icu,
+    include_directories : inc,
+  )
+)
+
+test(
+  'options',
+  executable(
+    'options_test',
+    'main.cpp', 'options.cpp',
+    dependencies : dep_icu,
+    include_directories : inc,
+  )
+)
+
+if cpp.get_id() == 'clang' and host_machine.system() == 'linux'
+  executable(
+    'fuzzer',
+    'fuzz.cpp',
+    cpp_args : ['-fsanitize=fuzzer'],
+    link_args : ['-fsanitize=fuzzer'],
+    dependencies : dep_icu,
+    include_directories : inc,
+  )
+endif
+
+# Meson can generate basic cmake-configs files, but not when targets are used,
+# so these tests don't make sense