>I get the following errors when I try to build the project:

>1>project.obj : error LNK2001: unresolved external symbol __imp_curl_easy_init
>1> project.obj : error LNK2001: unresolved external symbol __imp_curl_easy_setopt
>1> project.obj : error LNK2001: unresolved external symbol __imp_curl_easy_perform
>1> project.obj : error LNK2001: unresolved external symbol __imp_curl_easy_strerror
>1> project.obj : error LNK2001: unresolved external symbol __imp_curl_easy_cleanup
>1>C:\Users\user\source\repos\project\x64\Release\project.exe : fatal error LNK1120: 5 unresolved externals

The symbols come from curl. Something is wrong with your build command.

>After some Googling, it looked like I may need to add CURL_STATICLIB to my preprocessor definitions in the project properties. I do so and I get the following errors:

>1>libcurl_a.lib(easy.obj) : error LNK2001: unresolved external symbol __imp_WSAStartup
>1>libcurl_a.lib(telnet.obj) : error LNK2001: unresolved external symbol __imp_WSAStartup
>1>libcurl_a.lib(easy.obj) : error LNK2001: unresolved external symbol __imp_WSACleanup
...
>1>libcurl_a.lib(connect.obj) : error LNK2001: unresolved external symbol __imp_connect
>1>libcurl_a.lib(connect.obj) : error LNK2001: unresolved external symbol __imp_getpeername
>1>libcurl_a.lib(connect.obj) : error LNK2001: unresolved external symbol __imp_getsockname
>1>libcurl_a.lib(ftp.obj<ftp://ftp.obj>) : error LNK2001: unresolved external symbol __imp_getsockname
...
>1>libcurl_a.lib(curl_gethostname.obj) : error LNK2001: unresolved external symbol __imp_gethostname
>1>libcurl_a.lib(krb5_sspi.obj) : error LNK2001: unresolved external symbol __imp_htonl
>1>libcurl_a.lib(krb5_sspi.obj) : error LNK2001: unresolved external symbol __imp_ntohl
>1>C:\Users\user\source\repos\project\x64\Release\project.exe : fatal error LNK1120: 60 unresolved externals

>Could someone please let me know where I have messed up or what I am doing wrong? I have included the full command line flags, with "CURL_STATICLIB" defined. Thank you.

>Compiler flags:
>/permissive- /Yu"stdafx.h" /GS /GL /W3 /Gy /Zc:wchar_t /I"C:\Program Files (x86)\Curl\x64\libcurl-vc15-x64-release-static-ipv6-sspi-winssl\include" /Zi /Gm- /O2 /sdl /Fd"x64\Release\vc141.pdb" /Zc:inline /fp:precise /D >"CURL_STATICLIB" /D "NDEBUG" /D "_CONSOLE" /D "_UNICODE" /D "UNICODE" /errorReport:prompt /WX- /Zc:forScope /Gd /Oi /MT /FC /Fa"x64\Release\" /EHsc /nologo /Fo"x64\Release\" /Fp"x64\Release\project.pch" >/diagnostics:classic

>Linker flags:
>/OUT:"C:\Users\user\source\repos\project\x64\Release\project.exe" /MANIFEST /LTCG:incremental /NXCOMPAT /PDB:"C:\Users\user\source\repos\project\x64\Release\project.pdb" /DYNAMICBASE "libcurl_a.lib" >"kernel32.lib" "user32.lib" "gdi32.lib" "winspool.lib" "comdlg32.lib" "advapi32.lib" "shell32.lib" "ole32.lib" "oleaut32.lib" "uuid.lib" "odbc32.lib" "odbccp32.lib" /DEBUG /MACHINE:X64 /OPT:REF /INCREMENTAL:NO >/PGD:"C:\Users\user\source\repos\project\x64\Release\project.pgd" /SUBSYSTEM:CONSOLE /MANIFESTUAC:"level='asInvoker' uiAccess='false'" /ManifestFile:"x64\Release\project.exe.intermediate.manifest" /OPT:ICF >/ERRORREPORT:PROMPT /NOLOGO /LIBPATH:"C:\Program Files (x86)\Curl\x64\libcurl-vc15-x64-release-static-ipv6-sspi-winssl\lib" /TLBID:1

These unresolved symbols all from dependent (Windows) libraries of curl. You have to add them on your command line for the linker command. Some are already included (like kernel32.lib), but e.g. WSAStartup (see https://docs.microsoft.com/en-us/windows/desktop/api/winsock/nf-winsock-wsastartup) comes from ws2_32.lib. If you add that library in your build command line, this error will disappear. The automatic include of windows system libraries was removed by a pull request of me (see https://github.com/curl/curl/pull/2474). You have to add yourself windows system libraries that are needed by curl (depending on how you have configured curl, e.g. with or without openSSL etc).

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Received on 2018-07-19