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强制）还是不短（至少4个字节，用let request = NSBatchUpdateRequest(entityName: "ORAFieldMetadataMO")
let predicate = NSPredicate(format: "primaryKey != nil")
request.predicate = predicate
request.issueLocationDescSuggestions = ["issueLocationDescSuggestions" : json["issueLocationDescSuggestions"]]
强制） ）：
areas您会看到，嵌入式目标上的默认值为short，而托管平台上的默认值为no-short。改善托管平台上的二进制兼容性是有意义的。现在：
在构建gcc时，有什么规则告诉我枚举是否短，具体取决于配置选项？
编辑：
如伦丁的答案所指出，the gcc manual指出
在某些目标上，
-fshort-enums是默认设置；这取决于 ABI。
我的问题是：如何依赖于ABI，它在哪里记录？ gcc源代码是否包含一种将架构（例如arm-linux-gnueabihf）映射到ABI的数据库，以及一种为每个ABI指定所有选项（例如short枚举或no-short枚举）的数据库？还是所有硬编码的魔术散布在整个源代码树中？
答案 0 :(得分：4)
在gcc手册中，查找实现定义的行为。 Chapter 4.9。
与每种枚举类型（C90 6.5.2.2，C99和C11 6.7.2.2）兼容的整数类型。
通常，如果枚举中没有负值，则类型为
unsigned int，否则为int。如果指定了-fshort-enums，则如果存在负值，则signed char，short和int的第一个可以代表所有值，否则为第一个。可以代表所有值的unsigned char，unsigned short和unsigned int。在某些目标上，
-fshort-enums是默认设置；这是由ABI决定的。
斜体部分是从C标准的实现定义的行为中引用的。如您所见，类型是自适应的，取决于存在的枚举常量。对于不同的enum类型，它不必在您的程序中始终具有相同的大小。
优化设置可能很重要，因为在某些计算机上4字节enum可能比1字节枚举要快。