如何编译已经用GCC预处理的C代码？ [英] How can I compile C code that has already been C pre-processed with GCC?

问题描述

我在C预处理和C编译之间执行一些源处理。目前I：

1. gcc -E file.c> preprocessed_file.c 。


2. 对 preprocessed_file.c 执行更多操作。


3. 使用 preprocessed_file.c 继续编译。

尝试编译 preprocessed_file.c ，如果它是正常的C（步骤3），你会得到以下很多：

  /usr/include/stdio.h:257：error：redefinition的参数'restrict'
 /usr/include/stdio.h:257：error：previous definition 'restrict'在这里
 /usr/include/stdio.h:258：error：'restrict'的冲突类型
 /usr/include/stdio.h:258：error：以前的' restrict'is here 
 /usr/include/stdio.h:260：error：'restrict'的冲突类型
 [...] 
  中使用 #include< stdio.h>  。幸运的是，有一个选项告诉GCC它通过指定正在编译为 c-cpp-output 的语言已经预处理的C代码执行操作（参见 -x 上这页）。但它不工作。我只需要这样：
  $ gcc -x c-cpp-output -std = c99 bar.c 
 i686 -apple-darwin9-gcc-4.0.1：语言c-cpp输出无法识别
 i686-apple-darwin9-gcc-4.0.1：语言c-cpp输出无法识别
 ld警告：在bar.c中，文件不是必需的架构
未定义的符号：
_main，引用自：
 start in crt1.10.5.o 
 ld：symbol（s）找不到
 collect2：ld退回1退出状态
  
版本的GCC：
  $ gcc-mp-4.4 -x c-cpp-output -std = c99 bar.c 
 [same error stuff here] 
  
 
 
解决方案
在GCC文档中输入错误 - 请尝试'-x cpp-output'。
  gcc -E helloworld.c& cppout 
 gcc -x cpp-output cppout -o hw 
 ./hw 
你好，世界！ 
  
 
I'm performing some source processing between C preprocessing and C compilation. At the moment I:

gcc -E file.c > preprocessed_file.c.
Do more stuff to preprocessed_file.c.
Continue the compilation with preprocessed_file.c.
If you attempt to compile preprocessed_file.c as you would if it was normal C (step 3) you get lots of the following:
/usr/include/stdio.h:257: error: redefinition of parameter ‘restrict’
/usr/include/stdio.h:257: error: previous definition of ‘restrict’ was here
/usr/include/stdio.h:258: error: conflicting types for ‘restrict’
/usr/include/stdio.h:258: error: previous definition of ‘restrict’ was here
/usr/include/stdio.h:260: error: conflicting types for ‘restrict’
[...]
And that's just using #include <stdio.h> in file.c. Fortunately there's an option to tell GCC it's acting on C code that has already been preprocessed by specifying the language that is being compiled as c-cpp-output (see -x on this page). But it doesn't work. I just get this:
$ gcc -x c-cpp-output -std=c99 bar.c
i686-apple-darwin9-gcc-4.0.1: language c-cpp-output not recognized
i686-apple-darwin9-gcc-4.0.1: language c-cpp-output not recognized
ld warning: in bar.c, file is not of required architecture
Undefined symbols:
  "_main", referenced from:
      start in crt1.10.5.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
And exactly the same response with a newer version of GCC:
$ gcc-mp-4.4 -x c-cpp-output -std=c99 bar.c
[same error stuff comes here]

解决方案
Looks like a typo in the GCC docs - try '-x cpp-output' instead.
gcc -E helloworld.c > cppout
gcc -x cpp-output cppout -o hw
./hw
Hello, world!


                        
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