Add swift executable support in Xcode.

mesonbuild/backend/backends.py

@@ -423,6 +423,12 @@ class Backend:
                 return True
         return False
 
+    def determine_swift_dep_dirs(self, target):
+        result = []
+        for l in target.link_targets:
+            result.append(self.get_target_private_dir_abs(l))
+        return result
+
     def get_executable_serialisation(self, cmd, workdir=None,
                                      extra_bdeps=None, capture=None,
                                      env: T.Optional[build.EnvironmentVariables] = None):

mesonbuild/backend/ninjabackend.py

@@ -1716,12 +1716,6 @@ int dummy;
                 result.append(self.swift_module_file_name(l))
         return result
 
-    def determine_swift_dep_dirs(self, target):
-        result = []
-        for l in target.link_targets:
-            result.append(self.get_target_private_dir_abs(l))
-        return result
-
     def get_swift_link_deps(self, target):
         result = []
         for l in target.link_targets:

mesonbuild/backend/xcodebackend.py

@@ -47,6 +47,7 @@ LANGNAMEMAP = {'c': 'C',
                'cpp': 'CPLUSPLUS',
                'objc': 'OBJC',
                'objcpp': 'OBJCPLUSPLUS',
+               'swift': 'SWIFT_'
                }
 OPT2XCODEOPT = {'0': '0',
                 'g': '0',
@@ -1336,7 +1337,7 @@ class XCodeBackend(backends.Backend):
             bt_dict.add_item('buildSettings', settings_dict)
             settings_dict.add_item('ARCHS', '"$(NATIVE_ARCH_ACTUAL)"')
             settings_dict.add_item('ONLY_ACTIVE_ARCH', 'YES')
-            settings_dict.add_item('SWIFT_VERSION', '4.0')
+            settings_dict.add_item('SWIFT_VERSION', '5.0')
             settings_dict.add_item('SDKROOT', '"macosx"')
             settings_dict.add_item('SYMROOT', '"%s/build"' % self.environment.get_build_dir())
             bt_dict.add_item('name', f'"{buildtype}"')
@@ -1509,6 +1510,12 @@ class XCodeBackend(backends.Backend):
                 gargs = self.build.global_args[target.for_machine].get(lang, [])
                 targs = target.get_extra_args(lang)
                 args = warn_args + std_args + pargs + gargs + targs
+                if lang == 'swift':
+                    # For some reason putting Swift module dirs in HEADER_SEARCH_PATHS does not work,
+                    # but adding -I/path to manual args does work.
+                    swift_dep_dirs = self.determine_swift_dep_dirs(target)
+                    for d in swift_dep_dirs:
+                        args += compiler.get_include_args(d, False)
                 if args:
                     lang_cargs = cargs
                     if compiler and target.implicit_include_directories: