[CMake] Can two executables share one object file?

[Clark J. Wang]

Take the followling CMakeLists.txt as an example:

PROJECT(test)
SET(CMAKE_VERBOSE_MAKEFILE ON)
ADD_EXECUTABLE(hello1 main.c hello1.c)
ADD_EXECUTABLE(hello2 main.c hello2.c)

When running make, main.c will be compiled twice which is not neccessary. I
tried to write like this:

PROJECT(test)
SET(CMAKE_VERBOSE_MAKEFILE ON)
ADD_EXECUTABLE(hello1 main.c hello1.c)
ADD_EXECUTABLE(hello2 main.o hello2.c)  # use main.o instead of main.c

but it failed to cmake. So how can I let two executables share one single
object file?

Thanks.
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