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cpp -v 命令未在终端中结束

tag-icon • tag-icon 20.04 gcc
cpp -v 命令未在终端中结束

我使用Ubuntu 20.04。当我cpp -v在终端中运行时，输出如下：

...
...
Thread model: posix
gcc version 9.4.0 (Ubuntu 9.4.0-1ubuntu1~20.04.1) 
COLLECT_GCC_OPTIONS='-E' '-v' '-mtune=generic' '-march=x86-64'
 /usr/lib/gcc/x86_64-linux-gnu/9/cc1 -E -quiet -v -imultiarch x86_64-linux-gnu - -mtune=generic -march=x86-64 -fasynchronous-unwind-tables -fstack-protector-strong -Wformat -Wformat-security -fstack-clash-protection -fcf-protection
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/9/include-fixed"
ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/9/../../../../x86_64-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/lib/gcc/x86_64-linux-gnu/9/include
 /usr/local/include
 /usr/include/x86_64-linux-gnu
 /usr/include
End of search list.

问题是搜索列表结束，直到我按下 ，命令才会结束CTRL + C。

我想知道是什么原因导致了这个问题以及如何解决它？

答案1

从man cpp：

   The cpp command expects two file names as arguments, infile and
   outfile.  The preprocessor reads infile together with any other files
   it specifies with #include.  All the output generated by the combined
   input files is written in outfile.

   Either infile or outfile may be -, which as infile means to read from
   standard input and as outfile means to write to standard output.  If
   either file is omitted, it means the same as if - had been specified
   for that file.  You can also use the -o outfile option to specify the
   output file.

因此，由于您没有提供infile，cpp -v正在等待您通过终端提供标准输入；如果您希望提供空的输入你可以使用类似

cpp -v /dev/null

或者

: | cpp -v

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