xcode 添加C文件导致pch错误
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Adding C file causes pch error
提问by Alex I
I have an XCodeproject with objective-Cfiles. If I add a new (empty) C fileand try to build, I get a large number of errors right away while building a precompiled header, in ProcessPCH step. The errors are "fatal error: Could not build module 'Foundation'", and things in Foundation.hnot being found. Remove the C file and it builds again. What is going on, and how to fix it?
我有一个XCode包含objective-C文件的项目。如果我添加一个新的（空的）C file并尝试构建，在 ProcessPCH 步骤中构建预编译头时，我会立即收到大量错误。错误是“致命错误：无法构建模块‘基础’”，以及Foundation.h未找到的东西。删除 C 文件并重新构建。这是怎么回事，如何解决？
(XCode 5.0, OSX 10.8.4)
（XCode 5.0，OSX 10.8.4）
EDITI have tried Clean and Clean build folder, no effect.
编辑我试过清理和清理构建文件夹，没有效果。
EDITSetting Precompile prefix header = Noresults in a bunch of syntax errors instead, in stuff like NSObject.h(and other Foundation framework header).
编辑设置会Precompile prefix header = No导致一堆语法错误，比如NSObject.h（和其他 Foundation 框架标头）。
EDITUser Cy-4AH figured it out: there needs to be #ifdef __OBJC__around the wholepch file.
编辑用户 Cy-4AH 想通了：需要#ifdef __OBJC__围绕整个pch 文件。
回答by Cy-4AH
Surround #import's with preprocessor directive #ifdef __OBJC__ #endif
Surround#import带有预处理器指令#ifdef __OBJC__ #endif
