[CMake] CMake all_object_files target

[Raphael Grimm]

Hi,

I want to create a CMake target to build all object files. To do this, I 
first modified all targets to build an object file lib and link against it:

     add_library(exe_object_files OBJECT ${sources})
     set(ARMARX_EXE_OBJECT_FILES $<TARGET_OBJECTS:exe_object_files>)
     add_executable(exe $<TARGET_OBJECTS:exe_object_files>)

Since I have multiple executables, I added a target for all object files 
and added the targets for each executable as dependency:

     add_custom_target(all_exe_object_files)
     add_dependencies(all_exe_object_files exe_object_files)

This adds a all_exe_object_files target I can make, but making the 
target does nothing.
Then I tried adding the object files as sources:

     get_target_property(all_exe_object_files_sources 
all_exe_object_files SOURCES)
     if(NOT all_exe_object_files_sources)
         set(all_exe_object_files_sources)
     endif()
     list(APPEND all_exe_object_files_sources 
$<TARGET_OBJECTS:exe_object_files>)
     set_target_properties(all_exe_object_files PROPERTIES SOURCES 
"${all_exe_object_files_sources}")

This did not help.

I guess the reason is that add_library(... OBJECT ...) behaves similar 
to add_custom_command and the files are only build if a target uses them 
(and my custom target probably does not count as using the generated files).

What am I doing wrong and how can I create a target to build all object 
files?

Thanks for all hints.
Regards
Raphael


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