查看gcc/g++默认include路径

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最新推荐文章于 2024-10-13 16:32:54 发布

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本文详细分析了在不同环境下使用GCC和PowerPC Linux编译器时，C++源文件的搜索路径是如何被确定的。通过`-v`选项的输出，展示了默认的include路径顺序，有助于理解编译器如何查找头文件。

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`gcc -print-prog-name=cc1plus` -v

`g++ -print-prog-name=cc1plus` -v

例如，CentOS 6.3 64bit 下，`g++ -print-prog-name=cc1plus` -v 的运行结果是：

ignoring nonexistent directory "/usr/lib/gcc/x86_64-redhat-linux/4.4.6/include-fixed"

ignoring nonexistent directory "/usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../x86_64-redhat-linux/include"

#include "..." search starts here:

#include <...> search starts here:

/usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6

/usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/x86_64-redhat-linux

/usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/backward

/usr/local/include

/usr/lib/gcc/x86_64-redhat-linux/4.4.6/include

/usr/include

End of search list.

即，默认include路径是

/usr/include/c++/4.4.6

/usr/include/c++/4.4.6/x86_64-redhat-linux

/usr/include/c++/4.4.6/backward

/usr/local/include

/usr/lib/gcc/x86_64-redhat-linux/4.4.6/include

/usr/include

`powerpc-linux-gcc -print-prog-name=cc1` -v
ignoring nonexistent directory "/opt/freescale/usr/local/gcc-4.1.78-eglibc-2.5.78-1/powerpc-e300c3-linux-gnu/powerpc-e300c3-linux-gnu/libc/usr/local/include"
#include "..." search starts here:
#include <...> search starts here:
/opt/freescale/usr/local/gcc-4.1.78-eglibc-2.5.78-1/powerpc-e300c3-linux-gnu/lib/gcc/powerpc-e300c3-linux-gnu/4.1.2/include
/opt/freescale/usr/local/gcc-4.1.78-eglibc-2.5.78-1/powerpc-e300c3-linux-gnu/lib/gcc/powerpc-e300c3-linux-gnu/4.1.2/include-fixed
/opt/freescale/usr/local/gcc-4.1.78-eglibc-2.5.78-1/powerpc-e300c3-linux-gnu/lib/gcc/powerpc-e300c3-linux-gnu/4.1.2/../../../../powerpc-e300c3-linux-gnu/include
/opt/freescale/usr/local/gcc-4.1.78-eglibc-2.5.78-1/powerpc-e300c3-linux-gnu/powerpc-e300c3-linux-gnu/libc/usr/include
End of search list.

`powerpc-linux-gcc -print-prog-name=cc1plus` -v
ignoring nonexistent directory "/opt/freescale/usr/local/gcc-4.1.78-eglibc-2.5.78-1/powerpc-e300c3-linux-gnu/powerpc-e300c3-linux-gnu/libc/usr/local/include"
#include "..." search starts here:
#include <...> search starts here:
/opt/freescale/usr/local/gcc-4.1.78-eglibc-2.5.78-1/powerpc-e300c3-linux-gnu/lib/gcc/powerpc-e300c3-linux-gnu/4.1.2/../../../../powerpc-e300c3-linux-gnu/include/c++/4.1.2
/opt/freescale/usr/local/gcc-4.1.78-eglibc-2.5.78-1/powerpc-e300c3-linux-gnu/lib/gcc/powerpc-e300c3-linux-gnu/4.1.2/../../../../powerpc-e300c3-linux-gnu/include/c++/4.1.2/powerpc-e300c3-linux-gnu
/opt/freescale/usr/local/gcc-4.1.78-eglibc-2.5.78-1/powerpc-e300c3-linux-gnu/lib/gcc/powerpc-e300c3-linux-gnu/4.1.2/../../../../powerpc-e300c3-linux-gnu/include/c++/4.1.2/backward
/opt/freescale/usr/local/gcc-4.1.78-eglibc-2.5.78-1/powerpc-e300c3-linux-gnu/lib/gcc/powerpc-e300c3-linux-gnu/4.1.2/include
/opt/freescale/usr/local/gcc-4.1.78-eglibc-2.5.78-1/powerpc-e300c3-linux-gnu/lib/gcc/powerpc-e300c3-linux-gnu/4.1.2/include-fixed
/opt/freescale/usr/local/gcc-4.1.78-eglibc-2.5.78-1/powerpc-e300c3-linux-gnu/lib/gcc/powerpc-e300c3-linux-gnu/4.1.2/../../../../powerpc-e300c3-linux-gnu/include
/opt/freescale/usr/local/gcc-4.1.78-eglibc-2.5.78-1/powerpc-e300c3-linux-gnu/powerpc-e300c3-linux-gnu/libc/usr/include
End of search list.