Hi,

I'm trying to build an x64 static library of libcurl to use in a project
for Windows. I downloaded the latest version (7.61.0) and ran the following
command without getting any errors:

nmake /f Makefile.vc mode=static VC=15 MACHINE=x64 RTLIBCFG=static

Now, in a Visual Studio (2017) project, I use a simple example from
libcurl to test if everything is working. The source code is located here:
https://curl.haxx.se/libcurl/c/simple.html

I add the include and lib directories to the project properties and add the
.lib file as an input to the linker. I also use the "multi-threaded" option
for the runtime library since I used "RTLIBCFG=static" for the build
command.

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

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) : 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

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Received on 2018-07-18