Add support for depending on objfw

This uses objfw-config to get to the flags, however, there's still
several to dos that can only be addressed once dependencies can have
per-language flags.

mesonbuild/dependencies/__init__.py

@@ -223,6 +223,7 @@ def __init__(self, name: str, environment: 'Environment', kwargs: T.Dict[str, T.
     'openssl': 'misc',
     'libcrypto': 'misc',
     'libssl': 'misc',
+    'objfw': 'misc',
 
     # From platform:
     'appleframeworks': 'platform',

mesonbuild/dependencies/misc.py

@@ -474,6 +474,24 @@ def __init__(self, name: str, env: 'Environment', kwargs: T.Dict[str, T.Any]):
                     self.link_args.extend(sublib)
 
 
+class ObjFWDependencyConfigTool(ConfigToolDependency):
+
+    tools = ['objfw-config']
+    tool_name = 'objfw-config'
+
+    def __init__(self, name: str, environment: 'Environment', kwargs: T.Dict[str, T.Any]):
+        super().__init__(name, environment, kwargs)
+        if not self.is_found:
+            return
+        # TODO: Once Meson supports adding flags per language, only add --objcflags to ObjC
+        # TODO: Once Meson supports adding flags per language, add --cflags and --cxxflags
+        # TODO: Add support for --package, exposed as modules.
+        # TODO: Expose --reexport
+        # TODO: Expose --framework-libs
+        self.compile_args = self.get_config_value(['--cppflags', '--objcflags'], 'compile_args')
+        self.link_args = self.get_config_value(['--ldflags', '--libs'], 'link_args')
+
+
 @factory_methods({DependencyMethods.PKGCONFIG, DependencyMethods.CONFIG_TOOL, DependencyMethods.SYSTEM})
 def curses_factory(env: 'Environment',
                    for_machine: 'mesonlib.MachineChoice',
@@ -616,3 +634,9 @@ def shaderc_factory(env: 'Environment',
     system_class=OpensslSystemDependency,
     cmake_class=CMakeDependencyFactory('OpenSSL', modules=['OpenSSL::SSL']),
 )
+
+packages['objfw'] = objfw_factory = DependencyFactory(
+    'objfw',
+    [DependencyMethods.CONFIG_TOOL],
+    configtool_class=ObjFWDependencyConfigTool,
+)

test cases/objc/5 objfw/TestApplication.m

@@ -0,0 +1,13 @@
+#import <ObjFW/ObjFW.h>
+
+@interface TestApplication: OFObject <OFApplicationDelegate>
+@end
+
+OF_APPLICATION_DELEGATE(TestApplication)
+
+@implementation TestApplication
+- (void)applicationDidFinishLaunching: (OFNotification *)notification
+{
+	[OFApplication terminate];
+}
+@end

test cases/objc/5 objfw/meson.build

@@ -0,0 +1,13 @@
+project('TestApplication', 'objc',
+  version: '0.1',
+  default_options: ['warning_level=3'])
+
+objfw_dep = dependency('objfw', required: false)
+if not objfw_dep.found()
+  error('MESON_SKIP_TEST: Need objfw dependency')
+endif
+
+exe = executable('TestApplication', 'TestApplication.m',
+  dependencies: [objfw_dep])
+
+test('basic', exe)

test cases/objcpp/3 objfw/TestApplication.mm

@@ -0,0 +1,13 @@
+#import <ObjFW/ObjFW.h>
+
+@interface TestApplication: OFObject <OFApplicationDelegate>
+@end
+
+OF_APPLICATION_DELEGATE(TestApplication)
+
+@implementation TestApplication
+- (void)applicationDidFinishLaunching: (OFNotification *)notification
+{
+	[OFApplication terminate];
+}
+@end

test cases/objcpp/3 objfw/meson.build

@@ -0,0 +1,13 @@
+project('TestApplication', 'objcpp',
+  version: '0.1',
+  default_options: ['warning_level=3'])
+
+objfw_dep = dependency('objfw', required: false)
+if not objfw_dep.found()
+  error('MESON_SKIP_TEST: Need objfw dependency')
+endif
+
+exe = executable('TestApplication', 'TestApplication.mm',
+  dependencies: [objfw_dep])
+
+test('basic', exe)