[buildsystem] Add STRICT_JSONCPP_VERSION option.

CMakeLists.txt

@@ -39,6 +39,7 @@ option(PEDANTIC "Enable extra warnings and pedantic build flags. Treat all warni
 option(PROFILE_OPTIMIZER_STEPS "Output performance metrics for the optimiser steps." OFF)
 option(USE_SYSTEM_LIBRARIES "Use system libraries" OFF)
 option(ONLY_BUILD_SOLIDITY_LIBRARIES "Only build solidity libraries" OFF)
+option(STRICT_JSONCPP_VERSION "Strictly check installed jsoncpp version" ON)
 
 # Setup cccache.
 include(EthCcache)
@@ -62,6 +63,10 @@ if (PROFILE_OPTIMIZER_STEPS)
     add_definitions(-DPROFILE_OPTIMIZER_STEPS)
 endif()
 
+if (STRICT_JSONCPP_VERSION)
+	add_definitions(-DSTRICT_JSONCPP_VERSION_CHECK)
+endif()
+
 # Figure out what compiler and system are we using
 include(EthCompilerSettings)
 

libsolutil/JSON.cpp

@@ -30,10 +30,12 @@
 #include <map>
 #include <memory>
 
+#ifdef STRICT_JSONCPP_VERSION_CHECK
 static_assert(
 	(JSONCPP_VERSION_MAJOR == 1) && (JSONCPP_VERSION_MINOR == 9) && (JSONCPP_VERSION_PATCH == 3),
 	"Unexpected jsoncpp version: " JSONCPP_VERSION_STRING ". Expecting 1.9.3."
 );
+#endif
 
 namespace solidity::util
 {