Apply magical flags to make OSX ignore missing symbols in plugins.

mesonbuild/compilers.py

@@ -2208,7 +2208,7 @@ class ClangCompiler():
 
     def get_std_shared_module_link_args(self):
         if self.clang_type == CLANG_OSX:
-            return ['-bundle']
+            return ['-bundle', '-Wl,-undefined,dynamic_lookup']
         return ['-shared']
 
 class ClangCCompiler(ClangCompiler, CCompiler):

test cases/common/125 shared module/meson.build

@@ -2,18 +2,11 @@ project('shared module', 'c')
 
 dl = meson.get_compiler('c').find_library('dl', required : false)
 l = shared_library('runtime', 'runtime.c')
-if host_machine.system() == 'darwin' or host_machine.system() == 'windows'
-  # At least in OSX and seemingly also on Windows you must have
-  # all symbols present when linking a module.
-  #
-  # In Linux many projects build plugins without linking to
-  # the runtime so they have undefined symbols. We need to support
-  # both for ease of transitioning.
-  mlink = [l]
-else
-  mlink = []
-endif
-m = shared_module('mymodule', 'module.c', link_with : mlink)
+# Do NOT link the module with the runtime library. This
+# is a common approach for plugins that are only used
+# with dlopen. Any symbols are resolved dynamically
+# at runtime
+m = shared_module('mymodule', 'module.c')
 e = executable('prog', 'prog.c', link_with : l, dependencies : dl)
 test('import test', e, args : [m.full_path()])