Allow lllc to be installed

lllc/CMakeLists.txt

@@ -1,3 +1,19 @@
 add_executable(lllc main.cpp)
 target_link_libraries(lllc PRIVATE lll)
 
+if (INSTALL_LLLC)
+	include(GNUInstallDirs)
+	install(TARGETS lllc DESTINATION ${CMAKE_INSTALL_BINDIR})
+
+	if(LLLC_LINK_STATIC AND UNIX AND NOT APPLE)
+		# Produce lllc as statically linked binary (includes C/C++ standard libraries)
+		# This is not supported on macOS, see
+		# https://developer.apple.com/library/content/qa/qa1118/_index.html.
+		set_target_properties(
+			lllc PROPERTIES
+			LINK_FLAGS -static
+			LINK_SEARCH_START_STATIC ON
+			LINK_SEARCH_END_STATIC ON
+		)
+	endif()
+endif()