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預編譯輸出的行標志

調用預編譯器cpp預編譯main.cpp生成main.i文件：
   $cpp main.cpp > main.i
或者：
   $gcc -E main.cpp > main.i

生成的行號標志中有如下格式的：
   # 1 “/usr/include/features.h” 1 3 4
表示下面的內容是由某個文件的第幾行產生的。
但是最后面的幾個數字是什么意思？看不出來是什么。

查到的結果是：http://tigcc.ticalc.org/doc/cpp.html

Source file name and line number information is conveyed by lines of the form

# linenum filename flags

These are called linemarkers. They are inserted as needed into the output (but never within a string or character constant). They mean that the following line originated in file filename at line linenum. filename will never contain any non-printing characters; they are replaced with octal escape sequences.

After the file name comes zero or more flags, which are 1, 2, 3, or 4. If there are multiple flags, spaces separate them. Here is what the flags mean:

1    This indicates the start of a new file.
2    This indicates returning to a file (after having included another file).
3    This indicates that the following text comes from a system header file, so certain warnings should be suppressed.
4    This indicates that the following text should be treated as being wrapped in an implicit extern "C" block.

posted on 2010-09-15 10:53 金慶閱讀(579) 評論(0) 編輯收藏引用所屬分類: 1. C/C++ 、4. Linux/Unix

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