On 12/02/2010 08:25 AM, Alan W. Irwin wrote:
> On 2010-12-02 06:32+0100 Michael Wild wrote:
>
>> On 12/02/2010 12:37 AM, luxInteg wrote:
>>> On Tuesday 30 November 2010 22:43:34 luxInteg wrote:
>>>> Greetings
>>>>
>>>> I an learnig cmake.
>>>
>>> My test project is as follows:-
>>> linux machine with pyQt4, sip-4.10.2,qt-4.6.2 and cmake-2.8.2
>>>
>>> ---stepA: I have a file -fileA.sip.
>>> ---stepB: Upon execution of fileA.sip two files files -fileC.cpp and
>>> fileD.cpp result,
>>> ---stepC: fileC.cpp and fileD,cpp are compiled into a shared library.
>>>
>>> I am ok with stepC. I do not know how to carry out step B
>>> execution within
>>> cmake.
>>>
>>> advice would be appreciated.
>>>
>>> sincerely
>>> luxInteg
>>
>>
>> Use ADD_CUSTOM_COMMAND.
>
> @Michael: that advice is not correct. add_custom_command sets up a
> command to be run at "make" time. Instead, the execute_process command
> should be used to run a command at "CMake" time which is what the OP
> needs to generate his *.cpp files.
>
> @LuxInteg: See the CMakeLists.txt file at
> http://plplot.svn.sourceforge.net/viewvc/plplot/trunk/bindings/qt_gui/pyqt4/
>
> for an example of generating source code with sip.
>
> Alan
Huh, why can't he run sip at build time? If you do:
find_program(SIP_EXECUTABLE sip)
add_custom_command(OUTPUT
${CMAKE_CURRENT_BINARY_DIR}/fileC.cpp
${CMAKE_CURRENT_BINARY_DIR}/fileD.cpp
COMMAND ${SIP_EXECUTABLE} -c ${CMAKE_CURRENT_BINARY_DIR}
${CMAKE_CURRENT_SOURCE_DIR}/fileA.sip
DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/fileA.sip
COMMENT "Processing ${CMAKE_CURRENT_SOURCE_DIR}/fileA.sip"
VERBATIM)
add_library(myPythonExtension SHARED
${CMAKE_CURRENT_BINARY_DIR}/fileC.cpp
${CMAKE_CURRENT_BINARY_DIR}/fileD.cpp)
# possibly link with required libraries here...
That should perfectly work. IMHO generating the C++ files at CMake time
is definitely the wrong approach, since running the sip processor IS a
build step. Additionally, if you do it with EXECUTE_PROCESS, you'll have
to re-run CMake manually when you change any of the .sip files. Using
the ADD_CUSTOM_COMMAND, sip will be re-run automatically thanks to the
DEPENDS option.
Michael
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