我的电脑Mac，系统MaveRicks。
写一个C代码：
#include<stdio.h> void hello(){ printf("Hello, this is from C Language ~ "); }
编译一个库文件：
franklinMacmini:~ git$ gcc --shared -o libhello.so hello.c franklinMacmini:~ git$ ll -tr drwx------+ 3 git staff 102 Sep 2 01:36 Pictures drwx------+ 3 git staff 102 Sep 2 01:36 Music drwx------+ 3 git staff 102 Sep 2 01:36 Movies drwx------+ 26 git staff 884 Sep 2 01:36 Library drwx------+ 4 git staff 136 Sep 2 01:36 Downloads drwx------+ 3 git staff 102 Sep 2 01:36 Documents drwx------+ 3 git staff 102 Sep 2 01:36 Desktop drwxr-xr-x+ 5 git staff 170 Sep 2 01:36 Public -rw-r--r-- 1 git staff 82 Sep 26 23:01 hello.c -rwxr-xr-x 1 git staff 8392 Sep 26 23:08 libhello.so
写一个C++代码：
#include<iostream> #ifdef __cplusplus extern "C" { #endif void hello(); #ifdef __cplusplus } #endif int main(){ hello(); return 0; }
编译一下，要链接前面的动态库：
franklinMacmini:~ git$ g++ -L/Users/git test.cpp -o test -lhello franklinMacmini:~ git$ franklinMacmini:~ git$ franklinMacmini:~ git$ ll -tr drwx------+ 3 git staff 102 Sep 2 01:36 Pictures drwx------+ 3 git staff 102 Sep 2 01:36 Music drwx------+ 3 git staff 102 Sep 2 01:36 Movies drwx------+ 26 git staff 884 Sep 2 01:36 Library drwx------+ 4 git staff 136 Sep 2 01:36 Downloads drwx------+ 3 git staff 102 Sep 2 01:36 Documents drwx------+ 3 git staff 102 Sep 2 01:36 Desktop drwxr-xr-x+ 5 git staff 170 Sep 2 01:36 Public -rw-r--r-- 1 git staff 82 Sep 26 23:01 hello.c
-rwxr-xr-x 1 git staff 8392 Sep 26 23:06 libhello.so
-rw-r--r-- 1 git staff 144 Sep 26 23:07 test.cpp
-rwxr-xr-x 1 git staff 8472 Sep 26 23:08 test
执行一下：
franklinMacmini:~ git$ ./test Hello, this is from C Language ~
可以再玩玩，太无聊：
#include<stdio.h> void bonjour(){ printf("Bonjour, petit prince is also from C Language ~ "); }
编译一下：
franklinMacmini:~ git$ gcc --shared -o libbonjour.so bonjour.c franklinMacmini:~ git$ franklinMacmini:~ git$ ll -tr total 200
drwx------+ 3 git staff 102 Sep 2 01:36 Pictures drwx------+ 3 git staff 102 Sep 2 01:36 Music drwx------+ 3 git staff 102 Sep 2 01:36 Movies drwx------+ 26 git staff 884 Sep 2 01:36 Library drwx------+ 4 git staff 136 Sep 2 01:36 Downloads drwx------+ 3 git staff 102 Sep 2 01:36 Documents drwx------+ 3 git staff 102 Sep 2 01:36 Desktop drwxr-xr-x+ 5 git staff 170 Sep 2 01:36 Public -rw-r--r-- 1 git staff 82 Sep 26 23:01 hello.c -rwxr-xr-x 1 git staff 8392 Sep 26 23:08 libhello.so -rw-r--r-- 1 git staff 99 Sep 26 23:30 bonjour.c -rwxr-xr-x 1 git staff 8400 Sep 26 23:30 libbonjour.so -rw-r--r-- 1 git staff 238 Sep 26 23:31 test.cpp -rwxr-xr-x 1 git staff 8528 Sep 26 23:32 test
修改test.cpp代码：
#include <iostream> #ifdef __cplusplus extern "C" { #endif void hello(); #ifdef __cplusplus } #endif #ifdef __cplusplus extern "C"{ #endif void bonjour(); #ifdef __cplusplus } #endif int main() { hello(); bonjour(); return 0; }
再次编译test：
franklinMacmini:~ git$ franklinMacmini:~ git$ g++ -L/Users/git test.cpp -o test -lhello -lbonjour franklinMacmini:~ git$ ./test Hello, this is from C Language ~ Bonjour, petit prince is also from C Language ~ franklinMacmini:~ git$
反过来，C调用C++库的方式稍微复杂一点点，我就不班门弄斧了～
franklinMacmini:~ git$ file test test: Mach-O 64-bit executable x86_64 franklinMacmini:~ git$ file libbonjour.so libbonjour.so: Mach-O 64-bit dynamically linked shared library x86_64 franklinMacmini:~ git$ file libhello.so libhello.so: Mach-O 64-bit dynamically linked shared library x86_64 franklinMacmini:~ git$ franklinMacmini:~ git$ otool -hv test test: Mach header magic cputype cpusubtype caps filetype ncmds sizeofcmds flags MH_MAGIC_64 X86_64 ALL LIB64 EXECUTE 19 1344 NOUNDEFS DYLDLINK TWOLEVEL PIE franklinMacmini:~ git$
Game Over ～