如何解决这些 libcurl 链接错误?

How do I solve these libcurl linking errors?(如何解决这些 libcurl 链接错误?)

问题描述

[Administrator@windows ~]$ g++ client.cpp -lcurl -o client.exe
C:DOCUME~1ADMINI~1LOCALS~1TempccKXFUtC.o:client.cpp:(.text+0x23): undefined reference to `_imp__curl_global_init'
C:DOCUME~1ADMINI~1LOCALS~1TempccKXFUtC.o:client.cpp:(.text+0x5f): undefined reference to `_imp__curl_formadd'
C:DOCUME~1ADMINI~1LOCALS~1TempccKXFUtC.o:client.cpp:(.text+0x9b): undefined reference to `_imp__curl_formadd'
C:DOCUME~1ADMINI~1LOCALS~1TempccKXFUtC.o:client.cpp:(.text+0xa2): undefined reference to `_imp__curl_easy_init'
C:DOCUME~1ADMINI~1LOCALS~1TempccKXFUtC.o:client.cpp:(.text+0xc8): undefined reference to `_imp__curl_easy_setopt'
C:DOCUME~1ADMINI~1LOCALS~1TempccKXFUtC.o:client.cpp:(.text+0xe4): undefined reference to `_imp__curl_easy_setopt'
C:DOCUME~1ADMINI~1LOCALS~1TempccKXFUtC.o:client.cpp:(.text+0xf1): undefined reference to `_imp__curl_easy_perform'
C:DOCUME~1ADMINI~1LOCALS~1TempccKXFUtC.o:client.cpp:(.text+0x101): undefined reference to `_imp__curl_easy_cleanup'
C:DOCUME~1ADMINI~1LOCALS~1TempccKXFUtC.o:client.cpp:(.text+0x10e): undefined reference to `_imp__curl_formfree'
C:DOCUME~1ADMINI~1LOCALS~1TempccKXFUtC.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 google 搜索过了，除了邮件列表存档之外没有找到任何东西，并回复说google it".

I don't have this problem on linux so I don't know why this happens on windows. I googled it already and didn't find anything except mailing list archives with the same question and reply saying "google it".

我正在使用 mingw.我在构建 libcurl 时确实收到了一些链接器警告，但它们似乎与 ssl 相关，而且我不知道这是否很重要，因为它构建时没有错误.

I'm using mingw. I did get some linker warnings when I built libcurl but they seemed to be ssl related and I don't know if it's a big deal because it built without errors.

*** 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.

推荐答案

通过添加选项 -lcurl.dll，我能够避免 windows (mingw win32) 上的这些 curl 链接错误.-DCURL_STATICLIB 在我的情况下不需要.

I was able to avoid these curl linking errors on windows (mingw win32) by adding option -lcurl.dll. -DCURL_STATICLIB was not needed in my case.

我的构建在 mingw/lib 文件夹中有两个 libcurl 文件:libcurl.a 和 libcurl.dll.a

My build has two libcurl files in mingw/lib folder: libcurl.a and libcurl.dll.a

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