I am currently trying to build Libcurl 7.54.0 with OpenSSL and HTTP2 on windows 10 using Visual Studio 2015 and I am getting these errors in the build log at the end of compilation:
1>libcurl.lib(http2.obj) : error LNK2019: unresolved external symbol __imp__nghttp2_session_callbacks_new referenced in function _Curl_http2_init
1>libcurl.lib(http2.obj) : error LNK2019: unresolved external symbol __imp__nghttp2_session_callbacks_del referenced in function _Curl_http2_init
1>libcurl.lib(http2.obj) : error LNK2019: unresolved external symbol __imp__nghttp2_session_callbacks_set_send_callback referenced in function _Curl_http2_init
1>libcurl.lib(http2.obj) : error LNK2019: unresolved external symbol __imp__nghttp2_session_callbacks_set_on_frame_recv_callback referenced in function _Curl_http2_init
1>libcurl.lib(http2.obj) : error LNK2019: unresolved external symbol __imp__nghttp2_session_callbacks_set_on_invalid_frame_recv_callback referenced in function _Curl_http2_init
1>libcurl.lib(http2.obj) : error LNK2019: unresolved external symbol __imp__nghttp2_session_callbacks_set_on_data_chunk_recv_callback referenced in function _Curl_http2_init
1>libcurl.lib(http2.obj) : error LNK2019: unresolved external symbol __imp__nghttp2_session_callbacks_set_before_frame_send_callback referenced in function _Curl_http2_init
1>libcurl.lib(http2.obj) : error LNK2019: unresolved external symbol __imp__nghttp2_session_callbacks_set_on_frame_send_callback referenced in function _Curl_http2_init
1>libcurl.lib(http2.obj) : error LNK2019: unresolved external symbol __imp__nghttp2_session_callbacks_set_on_frame_not_send_callback referenced in function _Curl_http2_init
1>libcurl.lib(http2.obj) : error LNK2019: unresolved external symbol __imp__nghttp2_session_callbacks_set_on_stream_close_callback referenced in function _Curl_http2_init
1>libcurl.lib(http2.obj) : error LNK2019: unresolved external symbol __imp__nghttp2_session_callbacks_set_on_begin_headers_callback referenced in function _Curl_http2_init
1>libcurl.lib(http2.obj) : error LNK2019: unresolved external symbol __imp__nghttp2_session_callbacks_set_on_header_callback referenced in function _Curl_http2_init
1>libcurl.lib(http2.obj) : error LNK2019: unresolved external symbol __imp__nghttp2_session_callbacks_set_error_callback referenced in function _Curl_http2_init
1>libcurl.lib(http2.obj) : error LNK2019: unresolved external symbol __imp__nghttp2_session_client_new referenced in function _Curl_http2_init
1>libcurl.lib(http2.obj) : error LNK2019: unresolved external symbol __imp__nghttp2_session_del referenced in function _http2_disconnect
1>libcurl.lib(http2.obj) : error LNK2019: unresolved external symbol __imp__nghttp2_session_send referenced in function _h2_session_send
1>libcurl.lib(http2.obj) : error LNK2019: unresolved external symbol __imp__nghttp2_session_mem_recv referenced in function _Curl_http2_switched
1>libcurl.lib(http2.obj) : error LNK2019: unresolved external symbol __imp__nghttp2_session_resume_data referenced in function _Curl_http2_done_sending
1>libcurl.lib(http2.obj) : error LNK2019: unresolved external symbol __imp__nghttp2_session_want_read referenced in function _should_close_session
1>libcurl.lib(http2.obj) : error LNK2019: unresolved external symbol __imp__nghttp2_session_want_write referenced in function _http2_perform_getsock
1>libcurl.lib(http2.obj) : error LNK2019: unresolved external symbol __imp__nghttp2_session_get_stream_user_data referenced in function _before_frame_send
1>libcurl.lib(http2.obj) : error LNK2019: unresolved external symbol __imp__nghttp2_session_set_stream_user_data referenced in function _Curl_http2_done
1>libcurl.lib(http2.obj) : error LNK2019: unresolved external symbol __imp__nghttp2_session_get_remote_settings referenced in function _on_frame_recv
1>libcurl.lib(http2.obj) : error LNK2019: unresolved external symbol __imp__nghttp2_session_upgrade referenced in function _Curl_http2_switched
1>libcurl.lib(http2.obj) : error LNK2019: unresolved external symbol __imp__nghttp2_pack_settings_payload referenced in function _Curl_http2_request_upgrade
1>libcurl.lib(http2.obj) : error LNK2019: unresolved external symbol __imp__nghttp2_strerror referenced in function _Curl_http2_switched
1>libcurl.lib(http2.obj) : error LNK2019: unresolved external symbol __imp__nghttp2_http2_strerror referenced in function _Curl_http2_strerror
1>libcurl.lib(http2.obj) : error LNK2019: unresolved external symbol __imp__nghttp2_priority_spec_init referenced in function _h2_pri_spec
1>libcurl.lib(http2.obj) : error LNK2019: unresolved external symbol __imp__nghttp2_submit_request referenced in function _http2_send
1>libcurl.lib(http2.obj) : error LNK2019: unresolved external symbol __imp__nghttp2_submit_priority referenced in function _h2_session_send
1>libcurl.lib(http2.obj) : error LNK2019: unresolved external symbol __imp__nghttp2_submit_rst_stream referenced in function _Curl_http2_done
1>libcurl.lib(http2.obj) : error LNK2019: unresolved external symbol __imp__nghttp2_submit_settings referenced in function _Curl_http2_switched
1>libcurl.lib(http2.obj) : error LNK2019: unresolved external symbol __imp__nghttp2_session_set_local_window_size referenced in function _Curl_http2_switched
1>libcurl.lib(http2.obj) : error LNK2019: unresolved external symbol __imp__nghttp2_version referenced in function _Curl_http2_ver
1>libcurl.lib(http2.obj) : error LNK2019: unresolved external symbol __imp__nghttp2_is_fatal referenced in function _Curl_http2_switched
1>..\..\..\..\build\Win32\VC14\LIB Release - DLL OpenSSL\curl.exe : fatal error LNK1120: 35 unresolved externals
According to OpenSSL & nghttp2 path on my computer, I have added the following to curl & libcurl project: I have added the following folders to my additionnal library directories (curl project->properties->configuration properties->linker->general->additionnal library directories) :
C:\OpenSSL-Win32\lib
C:\nghttp2-1.22.0\lib
And added for both curl and libcurl project additionnal include directories (both projects->properties->configuration properties->c/c++->general->additionnal include directories) :
C:\OpenSSL-Win32\include
C:\nghttp2-1.22.0\lib\includes
I also added the definition of USE_NGHTTP2 to both project preprocessor definitions (both projects->properties->configuration properties->C/C++->Preprocessor->Preprocessor Definitions) in order to compile with nghttp2.
Finally, I am building using configuration "LIB Release - DLL OpenSSL" with target platform Win32.
Edit: the issue seems to be related to nghttp2 as I successfully build without the NGHTTP2 preprocessor definition.
I am surely missing something but I can't see what at the moment.
Thank you for your assistance
Lucas