'LIBCMT' conflicts with use of other libs + unresolved external symbols

Question

I have a program using OpenGL 3.2(+libs) and FreeType2. Then an other program with Boost and OpenSSL. The OpenGL side was to make sure text could be rendered and the boost/openssl program is to do a secure login/game server.

Both programs work fine by them selfs.

However adding Boost and OpenSSL to the game(GL + freetype) project caused it to fail to link.

I have linked the following libs as well as including there includes folder.

glimg.lib glutil.lib glfw.lib opengl32.lib freetype.lib glew32.lib user32.lib libeay32.lib ssleay32.lib

The linker error is.

1>LINK : warning LNK4098: defaultlib 'LIBCMT' conflicts with use of other libs; use /NODEFAULTLIB:library 1>libeay32.lib(cryptlib.obj) : error LNK2001: unresolved external symbol __imp__DeregisterEventSource@4 1>libeay32.lib(cryptlib.obj) : error LNK2001: unresolved external symbol __imp__ReportEventA@36 1>libeay32.lib(cryptlib.obj) : error LNK2001: unresolved external symbol __imp__RegisterEventSourceA@8 1>libeay32.lib(rand_win.obj) : error LNK2001: unresolved external symbol __imp__DeleteDC@4 1>libeay32.lib(rand_win.obj) : error LNK2001: unresolved external symbol __imp__DeleteObject@4 1>libeay32.lib(rand_win.obj) : error LNK2001: unresolved external symbol __imp__GetBitmapBits@12 1>libeay32.lib(rand_win.obj) : error LNK2001: unresolved external symbol __imp__BitBlt@36 1>libeay32.lib(rand_win.obj) : error LNK2001: unresolved external symbol __imp__GetObjectA@12 1>libeay32.lib(rand_win.obj) : error LNK2001: unresolved external symbol __imp__SelectObject@8 1>libeay32.lib(rand_win.obj) : error LNK2001: unresolved external symbol __imp__CreateCompatibleBitmap@12 1>libeay32.lib(rand_win.obj) : error LNK2001: unresolved external symbol __imp__GetDeviceCaps@8 1>libeay32.lib(rand_win.obj) : error LNK2001: unresolved external symbol __imp__CreateCompatibleDC@4 1>libeay32.lib(rand_win.obj) : error LNK2001: unresolved external symbol __imp__CreateDCA@16 1>.\BasicTexture.exe : fatal error LNK1120: 13 unresolved externals 

Runtime Library is set to Multi-threaded DLL (/MD)

I have no idea what to do I would really appreciate any help.

Answer 1

You are trying to compile with /MD, which is probably the right choice, but some code (probably one of the libraries) was built with /MT, and you can't have it both ways in the same program. You need to figure out which library was built with /MT and rebuild it with /MD.