Linux下，gcc 编译c代码的问题

cups_book

谁来解释一下这个命令？
[oracle@Tux10M simpapp]$ gcc fetch.c -I /u01/app/oracle/product/10.2.0/client_1/precomp/public/ -L /u01/app/oracle/product/10.2.0/client_1/lib/ -lclntsh

I是什么意思？
L是什么意思？

man过gcc，看不懂。

cups_book

GCC(1)                                                         GNU                                                         GCC(1)

NAME
       gcc - GNU project C and C++ compiler

SYNOPSIS
       gcc [-c|-S|-E] [-std=standard]
           [-g] [-pg] [-Olevel]
           [-Wwarn...] [-pedantic]
           [-Idir...] [-Ldir...]
           [-Dmacro[=defn]...] [-Umacro]
           [-foption...] [-mmachine-option...]
           [-o outfile] infile...

       Only the most useful options are listed here; see below for the remainder.  g++ accepts mostly the same options as gcc.

DESCRIPTION
       When you invoke GCC, it normally does preprocessing, compilation, assembly and linking.  The ''overall options'' allow you
       to stop this process at an intermediate stage.  For example, the -c option says not to run the linker.  Then the output
       consists of object files output by the assembler.

       Other options are passed on to one stage of processing.  Some options control the preprocessor and others the compiler
       itself.  Yet other options control the assembler and linker; most of these are not documented here, since you rarely need
       to use any of them.

       Most of the command line options that you can use with GCC are useful for C programs; when an option is only useful with
       another language (usually C++), the explanation says so explicitly.  If the description for a particular option does not
       mention a source language, you can use that option with all supported languages.

       The gcc program accepts options and file names as operands.  Many options have multi-letter names; therefore multiple sin-
       gle-letter options may not be grouped: -dr is very different from -d -r.

       You can mix options and other arguments.  For the most part, the order you use doesn't matter.  Order does matter when you
       use several options of the same kind; for example, if you specify -L more than once, the directories are searched in the
       order specified.

       Many options have long names starting with -f or with -W---for example, -fforce-mem, -fstrength-reduce, -Wformat and so
       on.  Most of these have both positive and negative forms; the negative form of -ffoo would be -fno-foo.  This manual docu-
       ments only one of these two forms, whichever one is not the default.

hellioncu

-I 头文件的目录
-L lib的目录

daybreakcx

1.        -I dir
   
2.            Add the directory dir to the list of directories to be searched for header files.  Directories named by -I
   
3.            are searched before the standard system include directories.  If the directory dir is a standard system
   
4.            include directory, the option is ignored to ensure that the default search order for system directories and
   
5.            the special treatment of system headers are not defeated .  If dir begins with "=", then the "=" will be
   
6.            replaced by the sysroot prefix; see --sysroot and -isysroot.
   

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pengjianbokobe

I添加头文件，L添加库

rain_fish

I 头文件路径
L 库文件路径

druselyy

恩 -I 是包含的头文件的路径名 一般头文件是在 /usr/local/include /usr/include 比如你要用oracle的一些头文件，-I 后面是你的头文件的路径. -L 是动态链接库的路径 一般动态链接库是在 /usr/lib /usr/local/lib下 但是你要用的库可能在你安装oracle的lib下 所以你需要指定一下路径. ldd  这个命令可以看到你生成后的可执行文件是否都有依赖库，具体用法可以查查

cups_book

果然，我没走错地方，感谢兄弟们

cups_book

那以上的兄弟们，谁有办法把以下的命令的两个I去掉？
[oracle@Tux10M simpapp]$ gcc fetch.c -I /u01/app/oracle/product/10.2.0/client_1/precomp/public/ -I /home/oracle/tux10/include -L /u01/app/oracle/product/10.2.0/client_1/lib/ -lclntsh
[oracle@Tux10M simpapp]$

也不是去掉，就是加到某个配置文件中去，从而不用每次都敲这么长的命令，--我不要用写成脚本，每次执行脚本的方法。

hellioncu

那以上的兄弟们，谁有办法把以下的命令的两个I去掉？
[oracle@Tux10M simpapp]$ gcc fetch.c -I /u01/app/ ...
cups_book 发表于 2010-09-08 14:43

    为啥不用make？
要不源代码中include指明全路径好了