Add opensmt2 interface

cmake/EthCompilerSettings.cmake

@@ -224,6 +224,7 @@ if(UNIX AND NOT APPLE)
 	option(USE_Z3_DLOPEN "Dynamically load the Z3 SMT solver instead of linking against it." OFF)
 endif()
 option(USE_CVC4 "Allow compiling with CVC4 SMT solver integration" ON)
+option(USE_OSMT2 "Allow compiling with OpenSMT2 SMT solver integration" ON)
 
 if (("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU") OR ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang"))
 	option(USE_LD_GOLD "Use GNU gold linker" ON)

cmake/FindOSMT2.cmake

@@ -0,0 +1,27 @@
+if (USE_OSMT2)
+	find_path(OSMT2_INCLUDE_DIR opensmt/opensmt2.h)
+	find_library(OSMT2_LIBRARY NAMES opensmt2)
+    include(FindPackageHandleStandardArgs)
+	find_package_handle_standard_args(OSMT2 DEFAULT_MSG OSMT2_LIBRARY OSMT2_INCLUDE_DIR)
+	if(OSMT2_FOUND)
+		# OSMT2 depends on GMP.
+		# We can assume that GMP is present on the system,
+        # so we quietly try to find it and link against it, if it is present.
+        find_package(GMP QUIET)
+
+		set(OSMT2_LIBRARIES ${OSMT2_LIBRARY})
+
+        if (GMP_FOUND)
+			set(OSMT2_LIBRARIES ${OSMT2_LIBRARIES} GMP::GMP)
+        endif ()
+
+		if (NOT TARGET OSMT2::OSMT2)
+			add_library(OSMT2::OSMT2 UNKNOWN IMPORTED)
+			set_property(TARGET OSMT2::OSMT2 PROPERTY IMPORTED_LOCATION ${OSMT2_LIBRARY})
+			set_property(TARGET OSMT2::OSMT2 PROPERTY INTERFACE_LINK_LIBRARIES ${OSMT2_LIBRARIES})
+			set_property(TARGET OSMT2::OSMT2 PROPERTY INTERFACE_INCLUDE_DIRECTORIES ${OSMT2_INCLUDE_DIR})
+        endif()
+    endif()
+else()
+	set(OSMT2_FOUND FALSE)
+endif()