Create, view, extract, and modify static databases in Linux (*.)

First, the static library file is packaged into multiple target files. In windows, the static library file suffix is. in linux, the static library file suffix is. a (a is short for archive, that is, document files ).

To put it bluntly, go to the topic.

　

   addition ( a ,   result=a+  }

Multiplication. c

     result=a*  }

 

　

 $ gcc - $ gcc -c multiplication.c

Among them, option-c enables gcc to compile only the source code into a. o file.

The current folder contains two. o files.

  addition.c multiplication.c addition.o multiplication.o

 

　

 $ ar cr libarith.a  addition.o multiplication.o

Cr indicates create, and a static library file libarith. a is created.

 

　

Before using the library file, you must first create a header file header. h, which contains the declaration of functions implemented in the library file.

  #include<stdio.h>  addition( a,  multiplication( a, b);

Then create a c program example. c to call the function.

  #include     result=addition(, printf( result=multiplition(, printf(   }

Compile example. c

 $ gcc example.c libarith.a -o example

The parameter after option-o specifies the executable file name generated by the compiler. If-o is not added, the default executable file name generated is a. out.

Run example

 $./ addtion result : multiplication result :

 

　

   multiplition.o

If you want to view which functions are included in the library file, you can use nm libarith. a to view which libraries need to be called by the executable file, you can use lld example to view them.

　

  $ cp libarith.a file/     multiplition.o

 

　

Suppose you already have a target file subtraction. o

     subtraction.o

If the subtraction. o file already exists in the library file, it overwrites the old one with a new one.

 

　

    subtraction.o

 

Reference Source: http://www.thegeekstuff.com/2010/08/ar-command-examples/