build: drop obj/ subdir for generated build.h, rename to bitcoin-build-info.h

Now that this file is not in a subfolder anymore, prefix it with
"bitcoin-" to avoid potential collisions. Also add "info" for a more
descriptive name.

src/CMakeLists.txt

@@ -8,14 +8,10 @@ include(AddWindowsResources)
 configure_file(${PROJECT_SOURCE_DIR}/cmake/bitcoin-config.h.in config/bitcoin-config.h USE_SOURCE_PERMISSIONS @ONLY)
 include_directories(${CMAKE_CURRENT_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR})
 
-# TODO: After the transition from Autotools to CMake, the obj/ subdirectory
-#       could be dropped as its only purpose was to separate a generated header
-#       from source files.
 add_custom_target(generate_build_info
-  BYPRODUCTS ${PROJECT_BINARY_DIR}/src/obj/build.h
+  BYPRODUCTS ${PROJECT_BINARY_DIR}/src/bitcoin-build-info.h
-  COMMAND ${CMAKE_COMMAND} -E make_directory ${PROJECT_BINARY_DIR}/src/obj
+  COMMAND ${CMAKE_COMMAND} -DBUILD_INFO_HEADER_PATH=${PROJECT_BINARY_DIR}/src/bitcoin-build-info.h -DSOURCE_DIR=${PROJECT_SOURCE_DIR} -P ${PROJECT_SOURCE_DIR}/cmake/script/GenerateBuildInfo.cmake
-  COMMAND ${CMAKE_COMMAND} -DBUILD_INFO_HEADER_PATH=${PROJECT_BINARY_DIR}/src/obj/build.h -DSOURCE_DIR=${PROJECT_SOURCE_DIR} -P ${PROJECT_SOURCE_DIR}/cmake/script/GenerateBuildInfo.cmake
+  COMMENT "Generating bitcoin-build-info.h"
-  COMMENT "Generating obj/build.h"
   VERBATIM
 )
 add_library(bitcoin_clientversion OBJECT EXCLUDE_FROM_ALL

src/clientversion.cpp

@@ -24,8 +24,8 @@ const std::string CLIENT_NAME("Satoshi");
 
 
 #ifdef HAVE_BUILD_INFO
-#include <obj/build.h>
+#include <bitcoin-build-info.h>
-// The <obj/build.h>, which is generated by the build environment (cmake/script/GenerateBuildInfo.cmake),
+// The <bitcoin-build-info.h>, which is generated by the build environment (cmake/script/GenerateBuildInfo.cmake),
 // could contain only one line of the following:
 //   - "#define BUILD_GIT_TAG ...", if the top commit is tagged
 //   - "#define BUILD_GIT_COMMIT ...", if the top commit is not tagged