[CMake] Generated files...

[Lars Pechan]

Hello,
I'm having some issues with generated files.

This is the example from the FAQ:

ADD_CUSTOM_COMMAND(
     OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/foo.c
     COMMAND ${CMAKE_COMMAND}
     ARGS -E copy ${CMAKE_CURRENT_SOURCE_DIR}/bar.c
                  ${CMAKE_CURRENT_BINARY_DIR}/foo.c
     DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/bar.c
     )
   ADD_EXECUTABLE(foo foo.c)

I thought I could do ARGS -E copy_if_different as another means of 
setting up the dependency. Ie if bar.c has changed a new copy operation 
will be done. I tested my theory by doing 'touch' on the original file 
and that didn't have any effect at all. It appears that 
copy_if_different requires more than just a newer timestamp to trigger?

The FAQ entry as it is written does trigger on a 'touch'ed source file 
so there is no immediate drama.

However, I have a cvs:ed source tree where I copy some files from 
various directories to build in my out-of-source tree. This means the 
original files are read-only (as they clearly should be). When I do the 
'touch' test CMake correctly tries to re-copy the touched file but that 
fails since the original copy has been copied as a read-only file. Is 
there any way around this?

Finally, I thought I'd be paranoid and ADDITIONAL_MAKE_CLEAN_FILES to 
blow the sources away. Regardless of whether I do

SET(tlSources init.c chomp.c last.c)

SET_DIRECTORY_PROPERTIES(PROPERTIES ADDITIONAL_MAKE_CLEAN_FILES 
${tlSources}) or

FOREACH(srcFile ${tlSources})
SET_DIRECTORY_PROPERTIES(PROPERTIES ADDITIONAL_MAKE_CLEAN_FILES 
${srcFile})
ENDFOREACH(srcFile)

I end up with a ADDITIONAL_MAKE_CLEAN_FILES in the Makefile consisting 
of the sole entry last.c?

All this is done using cmake-2.0.3 on WinXP generating NMake Makefiles.

Regards,

/Lars




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