Merge pull request #86 from CodeShark/build_info_h

Commit hash is stored in an automatically generated header file.

CMakeLists.txt

@@ -143,6 +143,12 @@ if(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
 	link_directories(/usr/local/lib)
 endif(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
 
+# Generate header file containing useful build information
+execute_process(COMMAND git --git-dir=${CMAKE_CURRENT_SOURCE_DIR}/.git --work-tree=${CMAKE_CURRENT_SOURCE_DIR} rev-parse HEAD OUTPUT_VARIABLE commit_hash OUTPUT_STRIP_TRAILING_WHITESPACE)
+message("Commit Hash: ${commit_hash}")
+file(WRITE ${CMAKE_CURRENT_BINARY_DIR}/BuildInfo.h "// This file was automatically generated by cmake\n#pragma once\n\n")
+file(APPEND ${CMAKE_CURRENT_BINARY_DIR}/BuildInfo.h "#define COMMIT_HASH \"${commit_hash}\"\n")
+
 add_subdirectory(secp256k1)
 add_subdirectory(libethereum)
 add_subdirectory(test)