包含 Linux 头文件
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Include Linux header file
提问by ashley
How could I include a linux header file? I read from the web that the header file is in /usr/include. However, the header file I need is not in that directory; it is in /usr/src/kernels/2.6.32.../include/linux/.
我怎么能包含一个linux头文件？我从网上读到头文件在/usr/include. 但是，我需要的头文件不在那个目录中；它在/usr/src/kernels/2.6.32.../include/linux/.
I tried to include the file using the full path. However, the file itself includes other header files as well. Hence, the compiler couldn't find the other header files when I compile.
我尝试使用完整路径包含该文件。但是，文件本身也包含其他头文件。因此，编译器在我编译时找不到其他头文件。
How could I include the header file in my program and compile the program?
如何在程序中包含头文件并编译程序？
回答by Alex Martelli
You may add to your gcccommand line -I(for "includes") options which specify other directories to search for include files (besides or actually even instead of the normal ones like /usr/include, though it's so long since I last needed the "instead of" that I don't recall how that's done == man gccshould tell you in 5 minutes if you need to find out;-).
您可以添加到您的gcc命令行-I（对于“包含”）选项，这些选项指定其他目录来搜索包含文件（除了或实际上甚至代替正常的，例如/usr/include，尽管自从我上次需要“代替”我已经很久了不记得这是怎么做的 ==man gcc如果您需要找出答案，应该在 5 分钟内告诉您；-)。
回答by Matt Joiner
If you are on Ubuntu, install libcpufreq-dev. This will give you the cpufreq.hheader at /usr/include/cpufreq.h, which you can include from your code with #include <cpufreq.h>.
如果您使用的是 Ubuntu，请安装libcpufreq-dev. 这将为您提供位于 的cpufreq.h标题/usr/include/cpufreq.h，您可以使用#include <cpufreq.h>.
回答by loxxy
By default, gcc searches the following directories for header files:
默认情况下，gcc 在以下目录中搜索头文件：
/usr/local/include/
/usr/include/
and the following directories for libraries:
以及以下库目录：
/usr/local/lib/
/usr/lib/
The compiler options -I and -L add new directories to the beginning of the include path and library search path respectively.
编译器选项 -I 和 -L 分别将新目录添加到包含路径和库搜索路径的开头。
