EthDependencies.cmake

# The Windows platform has not historically had any standard packaging system for delivering
# versioned releases of libraries.  Homebrew and PPA perform that function for macOS and Ubuntu
# respectively, and there are analogous standards for other Linux distros.  In the absense of
# such a standard, we have chosen to make a "fake packaging system" for cpp-ethereum, which is
# implemented in https://github.com/ethereum/cpp-dependencies.
#
# NOTE - In the last couple of years, the NuGet packaging system, first created for delivery
# of .NET packages, has added support for C++ packages, and it may be possible for us to migrate
# our "fake package server" to that real package server.   That would certainly be preferable
# to rolling our own, but it also puts us at the mercy of intermediate package maintainers who
# may be inactive.  There is not a fantastic range of packages available at the time of writing,
# so we might find that such a move turns us into becoming the package maintainer for our
# dependencies.   Not a net win :-)
#
# "Windows - Try to use NuGet C++ packages"
# https://github.com/ethereum/webthree-umbrella/issues/509
#
# Perhaps a better alternative is to step away from dependencies onto binary releases entirely,
# and switching to build-from-source for some (or all) of our dependencies, especially if they
# are small.  That gives us total control, but at the cost of longer build times.  That is the
# approach which Pawel has taken for LLVM in https://github.com/ethereum/evmjit.

if (MSVC)
	if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 19.0.0)
		message(FATAL_ERROR "ERROR - As of the 1.3.0 release, cpp-ethereum only supports Visual Studio 2015 or newer.\nPlease download from https://www.visualstudio.com/en-us/products/visual-studio-community-vs.aspx.")
	else()
		get_filename_component(ETH_DEPENDENCY_INSTALL_DIR "${CMAKE_CURRENT_LIST_DIR}/../deps/x64" ABSOLUTE)
	endif()
	set (CMAKE_PREFIX_PATH ${ETH_DEPENDENCY_INSTALL_DIR} ${CMAKE_PREFIX_PATH})
endif()

# custom cmake scripts
set(ETH_CMAKE_DIR ${CMAKE_CURRENT_LIST_DIR})
set(ETH_SCRIPTS_DIR ${ETH_CMAKE_DIR}/scripts)