Use C++11 for macOS and CS:GO.

Author: dvander

AMBuildScript

@@ -551,10 +551,27 @@ class SMConfig(object):
         compiler.defines += ['NO_HOOK_MALLOC', 'NO_MALLOC_OVERRIDE']
 
     if builder.target.platform == 'linux':
-        if sdk.name in ['csgo', 'blade']:
-          compiler.linkflags.remove('-static-libstdc++')
-          compiler.linkflags += ['-lstdc++']
-          compiler.defines += ['_GLIBCXX_USE_CXX11_ABI=0']
+      if sdk.name in ['csgo', 'blade']:
+        compiler.linkflags.remove('-static-libstdc++')
+        compiler.linkflags += ['-lstdc++']
+        compiler.defines += ['_GLIBCXX_USE_CXX11_ABI=0']
+    elif builder.target.platform == 'mac':
+      if sdk.name in ['csgo']:
+        # Switch libc++ to libstdc++ for protobuf linkage.
+        compiler.cxxflags.remove('-stdlib=libc++')
+        compiler.linkflags.remove('-stdlib=libc++')
+        compiler.linkflags.remove('-lc++')
+
+        compiler.cxxflags += ['-stdlib=libstdc++']
+        compiler.linkflags += ['-stdlib=libstdc++']
+        compiler.linkflags += ['-lstdc++']
+
+        if 'c++1y' in compiler.cxxflags:
+          compiler.cxxflags.remove('-std=c++1y')
+          compiler.cxxflags += ['-std=c++11']
+        elif 'c++14' in compiler.cxxflags:
+          compiler.cxxflags.remove('-std=c++14')
+          compiler.cxxflags += ['-std=c++11']
 
     for path in paths:
       compiler.cxxincludes += [os.path.join(sdk.path, *path)]