[CMake] ADD_CUSTOM_COMMAND and how to include generated files from other directories

[blinkeye]

On 02/17/2008 04:58 PM,  Alexander Neundorf wrote:
> On Sunday 17 February 2008, blinkeye wrote:
>> Hi guys
>>
>> I'm in the process of replacing Makefiles from two large projects with
>> CMake files. So far it's working great, but now I hit a wall:
>>
>> I need to generate .cpp and .h files from input files (analogue to the
>> .ui files of Qt).
> ...
>> Imagine the following project layout:
>>
>> src
>> -sub1
>> --CMakeLists.txt
>> --sub1.cpp
>> --sub1.ui
>> -sub2
>> --CMakeLists.txt
>> --sub2.cpp
>>
>> ${QT_UIC_EXECUTABLE} will read sub1.ui and generate a file like
>> "ui_sub1.h". sub1.cpp and sub2.cpp both include the file "ui_sub1.h".
>>
>> While above macro works for sub1 it doesn't work for sub2:
>>> make
>>> [ 20%] Generating ui_sub1.h
>>> [ 40%] Generating moc_sub1.cxx
>>> Scanning dependencies of target sub1
>>> [ 60%] Building CXX object src/sub1/CMakeFiles/sub1.dir/sub1.o
>>> [ 80%] Building CXX object src/sub1/CMakeFiles/sub1.dir/moc_sub1.o
>>> Linking CXX executable sub1
>>> [ 80%] Built target sub1
>>> Scanning dependencies of target sub2
>>> [100%] Building CXX object src/sub2/CMakeFiles/sub2.dir/sub2.o
>>> /home/cerberos/Desktop/mutacts/dan/src/sub2/sub2.cpp:4:21: error:
>>> ui_sub1.h: No such file or directory make[2]: ***
>>> [src/sub2/CMakeFiles/sub2.dir/sub2.o] Error 1
>>> make[1]: *** [src/sub2/CMakeFiles/sub2.dir/all] Error 2
>>> make: *** [all] Error 2
>> I tried for hours but I can't figure out a proper (or at least working)
>> way on how to achieve that. Changing above macro to include the path of
>> the generated header files doesn't seem to make a difference:
>>
>> MACRO (QT4_WRAP_UI_CUSTOM outfiles )
>>     FOREACH (it ${ARGN})
>>        GET_FILENAME_COMPONENT(outfile ${it} NAME_WE)
>>        GET_FILENAME_COMPONENT(infile ${it} ABSOLUTE)
>>        SET(outfile ${CMAKE_CURRENT_BINARY_DIR}/ui_${outfile}.h)
>>        include_directories( ${CMAKE_CURRENT_BINARY_DIR} )
>>        ADD_CUSTOM_COMMAND(OUTPUT ${outfile}
>>        COMMAND ${QT_UIC_EXECUTABLE}
>>        ARGS -o ${outfile} ${infile}
>>        MAIN_DEPENDENCY ${infile})
>>        SET(${outfiles} ${${outfiles}} ${outfile})
>>     ENDFOREACH (it)
>> ENDMACRO (QT4_WRAP_UI_CUSTOM)
>>
>> For some reason the included directory is lost in sub2 again (btw: is
>> there a way to log the currently included directories besides analysing
>> the make output?).
> 
> In that respect include directories work the same way as variables, they are 
> per directory, i.e. a sub directory inherits all the include dirs of its 
> parent directory, but the include directories of a subdir don't influence the 
> parent dir.
> 
> Did you try to put something like the following into sub2/CMakeLists.txt ?
> include_directories(${CMAKE_BINARY_DIR}/sub1) 
> 
> Alex
 >

Thanks for your prompt reply. Hmm, you're right, of course 
include_directories works like variables. Adding

include_directories(${CMAKE_BINARY_DIR}/sub1)

seems to work, so much for "not to see the wood for the trees". Will try 
it at work tomorrow with the real codebase.