Linux C dynamic shared library compilation link

1.1.1 LinuxWrite SoHow files are

1 first compile to add -fpic -fpic is to tell GCC generate a location-independent code

2GCC link to add -shared option, meaning to generate a shared library.

for linux or unix , one so file, file extension must be

1.1.2 LinuxUse So

GCCwhen linking, you need to add-L.representative from the current directory to find the relevant Sofiles,- Lfile name (but not including the file name at the beginning ofLiband extension So)

For example, compiling a MAIN.O file to be used in the current directory. liba.so Library

Gcc–o Main.out–l.–la MAIN.O

1.1.3 Configuration Profilefiles can be found in the current directory Sofile

Linux not in the current directory to find executable programs, but also not early in the current directory to find So Library Files

How to modify a User configuration file

1

Cd

2

VI. bash_profile

3

Export Ld_library_path = $LD _library_path:.

4

Save exit

5

. . bash_profile

[Email protected]:~/link/c$ cat mymax.c int max (Int a,int b) {if (a>b) Return a;elsereturn b;} [email protected]:~/link/c$ cat mymax.h  #ifndef  mymax_c_#define mymax_c_int  max (int a,int b); #endif  [email protected]:~/link/c$ cat main.c # include <stdio.h> #include   "mymax.h" Int main () {printf ("max =%d \n", Max (1,4)); return 0;} [EMAIL&NBSP;PROTECTED]:~/LINK/C$&NBSP;[EMAIL&NBSP;PROTECTED]:~/LINK/C$&NBSP;GCC&NBSP;-C&NBSP;-O&NBSP;MYMAX.O   -fPIC  mymax.c   tells the compiler to generate location-independent code [email protected]:~/link/c$ gcc - shared -o libmymax.so mymax.o  mymax.o  generate so shared library, must start with LIB, the extension must be .so[email  protected]:~/link/c$ gcc -c main.c -o main.o[email protected]:~/link/c$ gcc  -o main.out main.o -L. -lmymax[email protected]:~/link/c$ ./main.out max =4echo  ' export ld_library_path= $LD _library_path:. '  >> /home/chunli/.bashrc[email protected]:~/link/c$ . /home/chunli/.bashrc

Copy to another directory:

Still running:

[Email protected]:~/link/c$ cp libmymax.so Main.out/tmp/[email protected]:/tmp$./main.out Max =4

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Linux C dynamic shared library compilation link