访问 Xcode LLVM 处理器宏

Accessing Xcode LLVM Processor Macros

在 "Build Settings" 选项卡下的 "Apple LLVM 7.0 - Preprocessing" 部分,我将预处理器宏定义为:

HUBNAME=myhub

在我的代码中,我尝试将 HUBNAME 的值作为字符串引用:

SBNotificationHub* hub = [[SBNotificationHub alloc] initWithConnectionString:HUBLISTENACCESS notificationHubPath:HUBNAME];

但是 Xcode 认为 'myhub' 是我的变量名:

Use of undeclared identifier 'myhub'

谁能帮我弄清楚如何以字符串形式访问 'myhub'?

类似TO_STR(arg)=#arg HUBNAME=TO_STR("myhub")? (或者只是 TO_STR(myhub) w/o 引用。)

NSLog(@"%s", HUBNAME); // SO36947532[13085:4401425] myhub

来自 GNU:

3.4 Stringification

Sometimes you may want to convert a macro argument into a string constant. Parameters are not replaced inside string constants, but you can use the # preprocessing operator instead. When a macro parameter is used with a leading #, the preprocessor replaces it with the literal text of the actual argument, converted to a string constant. Unlike normal parameter replacement, the argument is not macro-expanded first. This is called stringification.