xcode C、Objective-C 预处理器输出
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C, Objective-C preprocessor output
提问by John Smith
Is there a way to get pre-processed C/Objective-C code? I have some files I acquired and would like to see the code produced by some #defines.
有没有办法获得预处理的C/Objective-C 代码？我有一些我获得的文件，并希望看到一些#defines 生成的代码。
回答by Paul R
From within Xcode:
从 Xcode 中：
- Xcode 3: Select the file, then Build → Preprocess.
- Xcode 4: Select the file, then Product → Generate Output → Generate Preprocessed File.
- Xcode 3：选择文件，然后Build → Preprocess。
- Xcode 4：选择文件，然后Product → Generate Output → Generate Preprocessed File。
回答by Mark Rushakoff
On the command line, gcc -E foo.mwill show you the preprocessed output (just as it does for normal C/C++ files). Of course, this will also expand any #includeor #importstatements you may have in your code.
在命令行上，gcc -E foo.m将显示预处理的输出（就像对普通 C/C++ 文件所做的那样）。当然，这也会扩展您的代码中可能包含的任何#includeor#import语句。
回答by Nate
Use the -Ecommand-line argument to gccor clang. This is documented as: “Preprocess only; do not compile, assemble or link” and indeed it outputs the preprocessed version to stdout.
使用-E命令行参数gcc或clang。这被记录为：“仅预处理；不编译、汇编或链接”，实际上它将预处理版本输出到stdout.
回答by jctank
In Xcode 5: Select the .m file, then Product -> Perform Action -> Preprocess ".m"
在 Xcode 5 中：选择.m 文件，然后选择Product -> Perform Action -> Preprocess ".m"
