克++未定義參考libscrypt_scrypt（連接參數不是問題？）

Question

這裏是我的包括：

#include <iostream> 
#include <string> 
#include <cstring> 
#include <stdio.h> //for snprintf 
#include <libscrypt.h> 
#include <sqlite3.h> 
#include "generator.h" //has no dependencies 

這是我的G ++ 4.2.1命令編譯錯誤：

# g++ -I/usr/local/include -L /usr/local/lib test.cpp generator.cpp -o test -lscrypt -lsqlite3 
/tmp//cctxmw4C.o: In function `insertUser()': 
test.cpp:(.text+0x607): undefined reference to `libscrypt_salt_gen(unsigned char*, unsigned long)' 
test.cpp:(.text+0x6c3): undefined reference to `libscrypt_scrypt(unsigned char const*, unsigned long, unsigned char const*, unsigned long, unsigned long long, unsigned int, unsigned int, unsigned char*, unsigned long)' 
collect2: ld returned 1 exit status 

類似的C代碼編譯用GCC罰款。 我不認爲參數的順序是問題 - 我嘗試過多種變體，包括移動-I，-L和-l標誌。 scrypt和sqlite3都是C庫，儘管頭文件和共享庫分別位於-I和-L，sqlite3仍不會引發錯誤。

Answer 1

看看這裏的解決方案。

Using C Libraries for C++ Programs

 

    extern "C"{ 
    void c_function_prototype(); 
    } 

或

 

    extern "C" void c_function_prototype(); 

If you have it see "The C++ Programming Language (Stoustrup) 4th Edition" p429