Generate BuildInfo header and display some information about evmjit library on demand

libevmjit/BuildInfo.h.in

@@ -0,0 +1,10 @@
+
+#define EVMJIT_VERSION "${EVMJIT_VERSION}"
+#define EVMJIT_VERSION_MAJOR ${EVMJIT_VERSION_MAJOR}
+#define EVMJIT_VERSION_MINOR ${EVMJIT_VERSION_MINOR}
+#define EVMJIT_VERSION_PATCH ${EVMJIT_VERSION_PATCH}
+#define EVMJIT_VERSION_PRERELEASE "${EVMJIT_VERSION_PRERELEASE}"
+#define EVMJIT_VERSION_FULL "${EVMJIT_VERSION_FULL}"
+
+#define LLVM_VERSION "${LLVM_PACKAGE_VERSION}"
+#define LLVM_ASSERTIONS "${LLVM_ENABLE_ASSERTIONS}"

libevmjit/CMakeLists.txt

@@ -47,14 +47,17 @@ else()
 	set(EVMJIT_SOVERSION ${EVMJIT_VERSION_MAJOR})
 endif()
 
+configure_file(BuildInfo.h.in ${CMAKE_CURRENT_BINARY_DIR}/gen/BuildInfo.gen.h)
+
 message(STATUS "EVM JIT version: ${EVMJIT_VERSION_MAJOR}.${EVMJIT_VERSION_MINOR}.${EVMJIT_VERSION_PATCH}-${EVMJIT_VERSION_PRERELEASE} (${EVMJIT_VERSION_FULL})")
 
-add_library(${TARGET_NAME} SHARED ${SOURCES} ${HEADERS})
+add_library(${TARGET_NAME} SHARED ${SOURCES} ${HEADERS} gen/BuildInfo.gen.h)
 set_target_properties(${TARGET_NAME} PROPERTIES 
 						VERSION ${EVMJIT_VERSION} SOVERSION ${EVMJIT_SOVERSION}
 						FOLDER "libs")
 
 include_directories(${LLVM_INCLUDE_DIRS})
+include_directories(${CMAKE_CURRENT_BINARY_DIR}/gen)
 
 target_link_libraries(${TARGET_NAME} PRIVATE ${LLVM_LIBS})
 

libevmjit/ExecutionEngine.cpp

@@ -19,6 +19,7 @@
 #include "Runtime.h"
 #include "Compiler.h"
 #include "Cache.h"
+#include "BuildInfo.gen.h"
 
 #include <iostream>
 
@@ -72,6 +73,16 @@ bool getEnvOption(char const* _name, bool _default)
 	return std::strtol(var, nullptr, 10) != 0;
 }
 
+bool showInfo()
+{
+	auto show = getEnvOption("EVMJIT_INFO", false);
+	if (show)
+	{
+		std::cout << "The Ethereum EVM JIT " EVMJIT_VERSION_FULL " LLVM " LLVM_VERSION << std::endl;
+	}
+	return show;
+}
+
 }
 
 ReturnCode ExecutionEngine::run(RuntimeData* _data, Env* _env)
@@ -79,6 +90,8 @@ ReturnCode ExecutionEngine::run(RuntimeData* _data, Env* _env)
 	static std::unique_ptr<llvm::ExecutionEngine> ee;  // TODO: Use Managed Objects from LLVM?
 	static auto debugDumpModule = getEnvOption("EVMJIT_DUMP", false);
 	static auto objectCacheEnabled = getEnvOption("EVMJIT_CACHE", true);
+	static auto infoShown = showInfo();
+	(void) infoShown;
 
 	auto codeBegin = _data->code;
 	auto codeEnd = codeBegin + _data->codeSize;