Support monolith build target

[bnoordhuis]

Port the v8_monolith build target to cmake. The monolith is a single static library that combines the separate libraries into a single "super" library.

v8-cmake/v8/BUILD.gn

Lines 3971 to 3988 in 6a73df8

	if (v8_monolithic) {
	# A component build is not monolithic.
	assert(!is_component_build)
	# Using external startup data would produce separate files.
	assert(!v8_use_external_startup_data)
	v8_static_library("v8_monolith") {
	deps = [
	":v8",
	":v8_libbase",
	":v8_libplatform",
	":v8_libsampler",
	"//build/win:default_exe_manifest",
	]
	configs = [ ":internal_config" ]
	}
	}

[JerrySievert]

given that I need this myself, do you have an example of a commit that would help to implement this? my cmake-foo is low, but I'm willing to try.

[bnoordhuis]

No commits I can point you to but you can glean the logic from BUILD.bazel or BUILD.gn. The main challenge is that you must first build a non-snapshot build to create the snapshot before you can create the monolith library.