我怎么知道“默认包含目录"，“默认链接目录"和“默认链接目录"?和“默认链接库"11.04中如何安装gcc，g ++/c ++? [英] How do I know the "default include directories", "default link directories" and "default link libraries" of gcc, g++/c++ in Ubuntu 11.04?

问题描述

对于以下3种编译情况:

  gcc -o helloc hello.c(1)g ++ -o hellocpp hello.cpp(2)C ++ -o hellocpp hello.cpp(3) 

我怎么分别知道默认包含目录"，默认链接目录"和默认链接库"?我在32位Ubuntu 11.04环境中使用gcc 4.5.2.

对于情况(1)，gcc是使用标准C库还是GNU C库?这两个C库之间有区别吗?

比较情况(2)和(3)，编译器使用的默认链接库"是否有区别?他们使用的是标准C ++库还是GNU C ++库?这两个C ++库之间有什么区别?

预先感谢您的任何建议.

曾志伟

解决方案

说 gcc -v 或 g ++ -v 以打印出有关环境的详细信息./p>

例如对我来说，这说:

  #include< ...>搜索从这里开始:/usr/local/lib/gcc/i686-pc-linux-gnu/4.6.2/../../../../include/c++/4.6.2/usr/local/lib/gcc/i686-pc-linux-gnu/4.6.2/../../../../include/c++/4.6.2/i686-pc-linux-gnu/usr/local/lib/gcc/i686-pc-linux-gnu/4.6.2/../../../../include/c++/4.6.2/backward/usr/local/lib/gcc/i686-pc-linux-gnu/4.6.2/include/usr/local/include/usr/local/lib/gcc/i686-pc-linux-gnu/4.6.2/include-fixed/usr/include 

也可以尝试使用 gcc -dumpspecs 来查看有关工具链中调用的工具的详细信息.

For the following 3 compile cases :

gcc -o helloc hello.c                    (1)

g++ -o hellocpp hello.cpp                (2)

c++ -o hellocpp hello.cpp                (3)

how do I know the "default include directories", "default link directories" and "default link libraries" in each case ? I am using gcc 4.5.2 in a 32 bit Ubuntu 11.04 environment.

For case (1), is gcc using the standard C libraries or the GNU C libraries ? Is there difference between the two C libraries ?

Comparing cases (2) and (3), is there any difference in the "default link libraries" used by the compiler ? Are they using the standard C++ libraries or the GNU C++ libraries ? What is the difference between the two C++ libraries ?

Thanks in advance for any suggestion.

Lawrence Tsang

解决方案

Say gcc -v, or g++ -v to print out verbose information about the environment.

E.g. for me this says:

#include <...> search starts here:
 /usr/local/lib/gcc/i686-pc-linux-gnu/4.6.2/../../../../include/c++/4.6.2
 /usr/local/lib/gcc/i686-pc-linux-gnu/4.6.2/../../../../include/c++/4.6.2/i686-pc-linux-gnu
 /usr/local/lib/gcc/i686-pc-linux-gnu/4.6.2/../../../../include/c++/4.6.2/backward
 /usr/local/lib/gcc/i686-pc-linux-gnu/4.6.2/include
 /usr/local/include
 /usr/local/lib/gcc/i686-pc-linux-gnu/4.6.2/include-fixed
 /usr/include

Also try gcc -dumpspecs to see details about the invoked tools in the tool chain.

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