NicolBolas

# Macro for setting up precompiled headers. Usage:
#
#   add_precompiled_header(target header.h [FORCEINCLUDE])
#
# MSVC: A source file with the same name as the header must exist and
# be included in the target (E.g. header.cpp).
#
# MSVC: Add FORCEINCLUDE to automatically include the precompiled
# header file from every source file.
#