[Administrator@windows ~]$ g++ client.cpp -lcurl -o client.exe
C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\ccKXFUtC.o:client.cpp:(.text+0x23): undefined reference to `_imp__curl_global_init'
C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\ccKXFUtC.o:client.cpp:(.text+0x5f): undefined reference to `_imp__curl_formadd'
C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\ccKXFUtC.o:client.cpp:(.text+0x9b): undefined reference to `_imp__curl_formadd'
C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\ccKXFUtC.o:client.cpp:(.text+0xa2): undefined reference to `_imp__curl_easy_init'
C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\ccKXFUtC.o:client.cpp:(.text+0xc8): undefined reference to `_imp__curl_easy_setopt'
C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\ccKXFUtC.o:client.cpp:(.text+0xe4): undefined reference to `_imp__curl_easy_setopt'
C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\ccKXFUtC.o:client.cpp:(.text+0xf1): undefined reference to `_imp__curl_easy_perform'
C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\ccKXFUtC.o:client.cpp:(.text+0x101): undefined reference to `_imp__curl_easy_cleanup'
C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\ccKXFUtC.o:client.cpp:(.text+0x10e): undefined reference to `_imp__curl_formfree'
C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\ccKXFUtC.o:client.cpp:(.text+0x11b): undefined reference to `_imp__curl_slist_free_all'
collect2: ld returned 1 exit status
我在linux上没有这个问题，所以我不知道为什么会在Windows上发生这种情况。我已经用谷歌搜索了，除了邮件列表档案以外，没有找到任何相同的问题和回复说“google it”。
我正在使用mingw。当我构建libcurl时，我确实得到了一些链接器警告，但它们似乎与ssl相关，我不知道它是否是一个大问题，因为它构建没有错误。
*** Warning: linker path does not have real file for library -lssl.
*** I have the capability to make that library automatically link in when
*** you link to this library. But I can only do this if you have a
*** shared version of the library, which you do not appear to have
*** because I did check the linker path looking for a file starting
*** with libssl and none of the candidates passed a file format test
*** using a file magic. Last file checked: /ssl/lib/libssl.a
*** Warning: linker path does not have real file for library -lcrypto.
*** I have the capability to make that library automatically link in when
*** you link to this library. But I can only do this if you have a
*** shared version of the library, which you do not appear to have
*** because I did check the linker path looking for a file starting
*** with libcrypto and none of the candidates passed a file format test
*** using a file magic. Last file checked: /ssl/lib/libcrypto.a
*** Warning: linker path does not have real file for library -lz.
*** I have the capability to make that library automatically link in when
*** you link to this library. But I can only do this if you have a
*** shared version of the library, which you do not appear to have
*** because I did check the linker path looking for a file starting
*** with libz and none of the candidates passed a file format test
*** using a file magic. Last file checked: /mingw/lib//libz.a
*** The inter-library dependencies that have been dropped here will be
*** automatically added whenever a program is linked with this library
*** or is declared to -dlopen it.
*** Since this library must not contain undefined symbols,
*** because either the platform does not support them or
*** it was explicitly requested with -no-undefined,
*** libtool will only create a static version of it.
答案 0 :(得分：8)
我能够通过添加选项-lcurl.dll来避免这些卷曲链接Windows（mingw win32）上的错误。在我的案例中不需要-DCURL_STATICLIB。
我的构建在mingw / lib文件夹中有两个libcurl文件：libcurl.a and libcurl.dll.a
答案 1 :(得分：6)
Libtool只构建了静态libcurl而不是动态库。您的标题正在寻找动态libcurl。这可能不是libcurl的错，因为我可以看到支持__declspec(dllimport)和__declspec(dllexport)的标题中的代码（这是包装作者知道什么是好的标志。
技术细节：see this answer regarding libssh。
解决方案：使用-DCURL_STATICLIB进行编译。
答案 2 :(得分：1)
使用netbeans 7.1和mingw有同样的问题。从属性中，链接器添加库libcurl.dll.a为我解决了这个问题。
运行mingw make后，此文件位于curl-7.28.1 \ lib.libs下。
答案 3 :(得分：0)
我在不同的项目中有类似的错误（使用libz和libsqlite）。 它由GNU libtool脚本生成。
我的理由是缺少这些库的某些文件（.la？）或libz.dll.a库的变体。
要获得automake / autoconf build ./configure --prefix=... ; make所需的所有文件，您必须使用zlib构建crypto，ssl和configure和make在同一个MSYS下。
cmake或自定义makefile构建通常不能用作共享库autotool构建的依赖项。
另一个也是最简单的选择是使用cmake（https://github.com/bagder/curl.git）构建动态卷曲