llvm dev - Dec 2018 - Linking with Clang on the command line? (And using LLVM with VS2017 IDE)

I'm messaging the list about this again.

I built LLVM, though I may need to do it again since I did both Release and
Debug configurations in the same sitting back to back and am worried that it may
have been the wrong thing to do (and I can't find the C++ standard headers
and library files even though I used the flag for enabling projects to also
enable libcxx as well when generating project files with CMake.  It could also
be that only be built ALL_BUILD.vcxproj and INSTALL.vcxproj and nothing else).

I just want to know how to link third-party libraries when trying to use LLD
with Clang on the command line on Windows.  I was using the Developer Command
Prompt for VS 2017 and I tried to link the library by doing "-L
/path/to/library-file.lib".  That seems to be wrong because I had linker
errors.  How do I provide input files to the linker once I've provided the
library search path with the -L flag?  As I understood it, the -L flag is for
the library search path and the -l flag is for the input file to search for, but
when I tried to do it earlier I kept getting errors still.  I tried linking
Boost.System by doing it like this: "-lboost_system-vc141-mt-x64-1_68"
(since the actual filename is libboost_system-vc141-x64-1_68.lib and I've
heard that Clang and GCC don't need the "lib" part at the
beginning and ending of the filename).  So how do I actually do it?

And I also want to know how to use LLVM as the toolchain instead of MSVC in the
VS2017 IDE.  I only have Clang version 3.7.0 enabled as toolset options.  How do
I use the LLVM/Clang version that I built?
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