运行preprocessor只，但只有某些语句 [英] Run preprocessor only but with only for certain statements

问题描述

我公司拥有一批在程序中定义调试语句，我希望能够使源代码的副本没有这些语句。

I have a number of debug statements defined in a program, and I want to be able to make a copy of the source without these statements.

在为了做到这一点，我第一次看GCC的-E命令行参数，只运行preprocessor，但是这确实远远超过了我想要的，扩大了包括文件和添加的#line语句。

In order to do this I first looked at GCC's -E command line argument, which only runs the preprocessor, however this did far more than I wanted, expanding the included files and adding #line statements.

例如：

#include <stdio.h>

#ifdef DEBUG
    #define debug( s ) puts ( s );
#else
    #define debug( s )
#endif

int main( int argc, char* argv[] )
{
    debug( "Foo" )

    puts( "Hello, World!" );

    return 0;
}

我希望这被加工成：

I'd want this to be processed to:

#include <stdio.h>

int main( int argc, char* argv[] )
{


    puts( "Hello, World!" );

    return 0;
}

然后我可以整理那以类似的astyle，没有手工作业将需要得到正是我想要的。

I could then tidy that up with something like astyle and no manual work would be needed to get exactly what I want.

有没有指示我丢失了GCC或者是有能力这样做的？

Is there a directive I'm missing for GCC or is there a tool capable of doing this?

推荐答案

如果 -E 是没有帮助，那么请尝试使用 -fdump树-all ，如果你看不到你想要的，是不是可用式（或）不提供的，由的 GCC 。

If -E is not helping, then try using -fdump-tree-all and if you don't see what you want the that is not-available-in (or) not-provided-by GCC.

OTOH，这个问题已经在SO如下，请参考下面得到一些想法进行讨论。

OTOH, this question has been discussed in SO as follows, please refer the below to get some ideas.

1. 能的gcc后C输出code preprocessing？


2. C / C ++ preprocessing
   

1. Can gcc output C code after preprocessing?
2. C/C++ source file after preprocessing

希望它帮助！

垫

我看到了@nos您的评论。但我有方便的一个这样的剧本，所以与大家分享。您可以尝试阅读我的答案类似的问题<一href=\"http://stackoverflow.com/questions/8742418/avoid-the-$p$pprocessing-of-includes/8742815#8742815\">here

I saw your comment to @nos. But I have one such script handy and so sharing it with you. You can try reading my answer for a similar question here

复制下面code在一个文件，说 convert.sh 。指定执行权限到该文件，搭配chmod + X convert.sh 键，如下运行它：

Copy the below code in a file, say convert.sh. Assign execute permission to that file, chmod +x convert.sh and run it as follows:

$./convert.sh <filename>.c
$cat filename.c.done

的＆LT;＆名GT;！.c.done 将有你需要的东西。

#!/bin/bash

if [[ $# -ne 1 || ! -f $1 ]] ; then
    echo "Invalid args / Check file "
    exit 
fi

file_name=$1

grep '^\s*#\s*include' $file_name > /tmp/include.c
grep -Pv '^\s*#\s*include\b' $file_name > /tmp/code.c
gcc -E /tmp/code.c | grep -v ^# > /tmp/preprocessed.c
cat /tmp/include.c > $file_name.done
cat /tmp/preprocessed.c >> $file_name.done

希望这有助于！

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