cmake/bochs: more strict dependency handling for libfailboch_external

The configure step for libfailbochs_external could be executed parallel
to other build steps, which required the files produced by the configure
step. Therefore a race-condition occurred. By giving the configure step
an explicit target name, more correct dependencies could be modeled
within bochs.cmake.

Change-Id: If2d7dafdace23b0eba6efcdff3ed0bfca2423048

src/core/comm/CMakeLists.txt

@@ -34,5 +34,8 @@ include_directories(${CMAKE_CURRENT_BINARY_DIR})
 set(PROTOBUF_IMPORT_DIRS ${PROTOBUF_IMPORT_DIRS} ${CMAKE_CURRENT_BINARY_DIR})
 PROTOBUF_GENERATE_CPP(PROTO_SRCS PROTO_HDRS ${PROTOS})
 
+add_custom_target(fail-protoc
+  DEPENDS ${PROTO_SRCS} ${PROTO_HDRS}
+)
 add_library(fail-comm ${SRCS} ${PROTO_SRCS} ${PROTO_HDRS})
 target_link_libraries(fail-comm ${PROTOBUF_LIBRARY})

src/core/efw/CMakeLists.txt

@@ -7,7 +7,7 @@ set(SRCS
 )
 
 add_library(fail-efw ${SRCS})
-add_dependencies(fail-efw fail-comm)
+add_dependencies(fail-efw fail-protoc)
 target_link_libraries(fail-efw fail-comm)
 target_link_libraries(fail-efw fail-util) # WallclockTimer