[CMake] Object files of a target/source file

[Michael Wild]

Hi all

Does anyone of you know how to reliably obtain the list of object  
files belonging to a target? And in the same line, how would I obtain  
the object file which corresponds to a certain source file (provided  
that it is only used for a single target)?

Using the approach shown in the CMake-Book (4th ed., p. 52) which  
simply replaces .cxx by .obj (obviously on Windows) does not work  
reliably, especially if the sources are not in  
CMAKE_CURRENT_SOURCE_DIR. On Windows (this is the case I'm interested  
in, regrettably), particularly with MSVC, additional problems arise if  
the same target has multiple files with the same file name in  
different directories. Because, by default, all object files seem to  
be built in ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}, EXCEPT if  
there are name clashes. In this case one of the objects gets built in $ 
{CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}, the others in  
subdirectories, in order to prevent the name clash.

So, you see, obtaining the object file name is anything but trivial. I  
scourged the documentation and Google, but couldn't find anything  
useful...


Thanks for your help in advance

Michael