c++ - Natty Narwhal 和 Oneiric Ocelot 之间共享对象链接的差异

Question

我正在编写一个简单的概念证明 C++ 应用程序(可在 https://github.com/paulspencerwilliams/CPlusPlusSocialPlayground 获得)，使用 twitcurl 编译，使用 http://code.google.com/p/twitcurl/wiki/WikiHowToUseTwitcurlLibrary 的确切说明.我可以毫无问题地编译和安装 twitcurl，我可以在 Natty Narwhal 上编译和执行我的应用程序。但是，在 Oneiric Ocelot 上编译我的应用程序(通过 Makefile)会出现以下链接问题:

g++ -ltwitcurl twitterClient.cpp -o twitterClient
/tmp/ccbxmSF3.o: In function `main':
twitterClient.cpp:(.text+0x1f7): undefined reference to `twitCurl::twitCurl()'
twitterClient.cpp:(.text+0x22e): undefined reference to `twitCurl::setTwitterUsername(std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)'
twitterClient.cpp:(.text+0x247): undefined reference to `twitCurl::setTwitterPassword(std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)'
twitterClient.cpp:(.text+0x280): undefined reference to `twitCurl::getOAuth()'
twitterClient.cpp:(.text+0x292): undefined reference to `oAuth::setConsumerKey(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'
twitterClient.cpp:(.text+0x2e9): undefined reference to `twitCurl::getOAuth()'
twitterClient.cpp:(.text+0x2fb): undefined reference to `oAuth::setConsumerSecret(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'
twitterClient.cpp:(.text+0x50c): undefined reference to `twitCurl::getOAuth()'
twitterClient.cpp:(.text+0x51e): undefined reference to `oAuth::setOAuthTokenKey(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'
twitterClient.cpp:(.text+0x52d): undefined reference to `twitCurl::getOAuth()'
twitterClient.cpp:(.text+0x53f): undefined reference to `oAuth::setOAuthTokenSecret(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'
twitterClient.cpp:(.text+0x56c): undefined reference to `twitCurl::oAuthRequestToken(std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)'
twitterClient.cpp:(.text+0x664): undefined reference to `twitCurl::getOAuth()'
twitterClient.cpp:(.text+0x676): undefined reference to `oAuth::setOAuthPin(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'
twitterClient.cpp:(.text+0x691): undefined reference to `twitCurl::oAuthHandlePIN(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'
twitterClient.cpp:(.text+0x6a0): undefined reference to `twitCurl::oAuthAccessToken()'
twitterClient.cpp:(.text+0x6af): undefined reference to `twitCurl::getOAuth()'
twitterClient.cpp:(.text+0x6c1): undefined reference to `oAuth::getOAuthTokenKey(std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)'
twitterClient.cpp:(.text+0x6d0): undefined reference to `twitCurl::getOAuth()'
twitterClient.cpp:(.text+0x6e2): undefined reference to `oAuth::getOAuthTokenSecret(std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)'
twitterClient.cpp:(.text+0x88e): undefined reference to `twitCurl::statusUpdate(std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)'
twitterClient.cpp:(.text+0x8ab): undefined reference to `twitCurl::getLastWebResponse(std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)'
twitterClient.cpp:(.text+0x8e7): undefined reference to `twitCurl::getLastCurlError(std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)'
twitterClient.cpp:(.text+0x97e): undefined reference to `twitCurl::timelineUserGet(bool, bool, unsigned int, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool)'
twitterClient.cpp:(.text+0x9bb): undefined reference to `twitCurl::getLastWebResponse(std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)'
twitterClient.cpp:(.text+0x9f7): undefined reference to `twitCurl::getLastCurlError(std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)'
twitterClient.cpp:(.text+0xa86): undefined reference to `twitCurl::~twitCurl()'
twitterClient.cpp:(.text+0xc64): undefined reference to `twitCurl::~twitCurl()'
collect2: ld returned 1 exit status
make: *** [all] Error 1

知道在这两个平台上编译有什么区别吗？为了进行精确比较，我在 AWS 上的 Ubuntu 64 位图像上进行了尝试，并得到了相同的症状。

编辑:我已经更改了我的 Makefile 中参数的顺序，但似乎没有通过第一个问题。但是，我现在在编译时遇到以下错误:

g++ twitterClient.cpp -o twitterClient -ltwitcurl
/usr/lib/gcc/x86_64-linux-gnu/4.6.1/../../../../lib/libtwitcurl.so: undefined reference to `curl_easy_getinfo'
/usr/lib/gcc/x86_64-linux-gnu/4.6.1/../../../../lib/libtwitcurl.so: undefined reference to `curl_easy_setopt'
/usr/lib/gcc/x86_64-linux-gnu/4.6.1/../../../../lib/libtwitcurl.so: undefined reference to `curl_easy_init'
/usr/lib/gcc/x86_64-linux-gnu/4.6.1/../../../../lib/libtwitcurl.so: undefined reference to `curl_slist_append'
/usr/lib/gcc/x86_64-linux-gnu/4.6.1/../../../../lib/libtwitcurl.so: undefined reference to `curl_slist_free_all'
/usr/lib/gcc/x86_64-linux-gnu/4.6.1/../../../../lib/libtwitcurl.so: undefined reference to `curl_easy_perform'
/usr/lib/gcc/x86_64-linux-gnu/4.6.1/../../../../lib/libtwitcurl.so: undefined reference to `curl_easy_cleanup'
collect2: ld returned 1 exit status
make: *** [all] Error 1

Answer 1

较新的 gcc 版本的 Oneiric 要求在源文件之后设置链接参数:

g++ twitterClient.cpp -o twitterClient -ltwitcurl