C++ 的库路径。失败？
我正在尝试在 Mac 上执行此代码。我已经安装了卷曲。当我搜索curl时，我可以在/usr/include/curl/curl.h下找到它。下面是我想要运行的程序。取自此处。
#include <iostream>
#include <curl/curl.h>
int main(void)
{
CURL *curl;
CURLcode res;
curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
res = curl_easy_perform(curl);
/* always cleanup */
curl_easy_cleanup(curl);
}
return 0;
}
当我尝试编译程序时。见下文。
g++ simple.cpp
Undefined symbols:
"_curl_easy_perform", referenced from:
_main in cciFNPkt.o
"_curl_easy_init", referenced from:
_main in cciFNPkt.o
"_curl_easy_setopt", referenced from:
_main in cciFNPkt.o
"_curl_easy_cleanup", referenced from:
_main in cciFNPkt.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
这是怎么回事？为什么程序找不到该文件的路径？
我该如何修复它？
Im trying to execute this code on a mac. I have installed the curl. When i search for curl, i can find it under /usr/include/curl/curl.h. Below is the program i want to run. Taken from here.
#include <iostream>
#include <curl/curl.h>
int main(void)
{
CURL *curl;
CURLcode res;
curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
res = curl_easy_perform(curl);
/* always cleanup */
curl_easy_cleanup(curl);
}
return 0;
}
when i try to compile the program. see below.
g++ simple.cpp
Undefined symbols:
"_curl_easy_perform", referenced from:
_main in cciFNPkt.o
"_curl_easy_init", referenced from:
_main in cciFNPkt.o
"_curl_easy_setopt", referenced from:
_main in cciFNPkt.o
"_curl_easy_cleanup", referenced from:
_main in cciFNPkt.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
What s going on? why doesnt the program finds the path of this file?
How can i fix it?
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评论（2）
您忘记链接 libcurl 库：
像
You’ve forgotten to link the libcurl library:
A header file such as
<curl/curl.h>(typically) only declares that a group of functions exist but does not contain the actual functions. In the case of curl on OS X Lion, those functions are in libcurl (/usr/lib/libcurl.dylib, which points to /usr/lib/libcurl.4.dylib). You need to tell the linker (via the compiler frontend) about that library, which can be done via-lcurl.程序确实找到了包含文件，但没有找到库文件。
库文件应该类似于 libcurl.dylib 或 libcurl.a
使用它来链接它：
The program does find the include file but not the library file.
The library file should be something like libcurl.dylib or libcurl.a
Use this to link with it: