[CMake] cmake my_BouncyBall

[Michael Hertling]

On 11/07/2010 03:37 PM, luxInteg wrote:
> On Sunday 07 November 2010 11:34:47 Richard Wackerbarth wrote:
>> First let me suggest that you word your request in a more complete manner.
>> What "does not work"? 
> cant get an executable generated  because the  'COMMAND' syntax is incorrect"
> so could you suggest the correct syntax please?
> 
>> What were you expecting and what did you get?
>> It is difficult, if not impossible, for us to guess.
>>
>> I suspect that the problem is related to the ">" (specifying the output
>> file in Unix). Are you on a Un*x platform? 
> yes linux
>> Remember that CMake uses a
>> different syntax because it assumes that the platform may not be
>> Unix-based.
>>
>> I also have no idea just what "BouncyBall" is supposed to do
> generate BouncyBall.out
> 
>> They look very much like a call to the
>> Unix "diff" command to verify that the output matches some previous
>> version (stored in BouncyBall.out)
> correct
> 
> which requires the  generation  an executable file first.
> 
>>
>> Provide additional details. Then we may be able to be more helpful.
> 
> DETAILS: as requested:
> 
>  add_executable(BouncyBall BouncyBall.c)
>  find_library(OLD_LIBRARY OLD)
>  target_link_libraries(BouncyBall ${OLD_LIBRARY})
>  COMMAND(./BouncyBall > my_BouncyBall.out
>        - diff BouncyBall.out my_BouncyBall.out)
>  
> 
> what is needed:-
> 
> 
> a) syntax for generating BouncyBall executable   with oppropriate linking to  
> ${OLD_LIBRARY}

The ADD_EXECUTABLE(), FIND_LIBRARY() and TARGET_LINK_LIBRARIES()
commands look good, provided the library OLD is actually found.

> b) syntax within cmake  for executing  BouncyBall executable   and diffing  
> output to 'existing'  outputfile  
> 
> i.e this bit:-
> (
>  COMMAND(./BouncyBall > my_BouncyBall.out   
> - diff BouncyBall.out   my_BouncyBall.out )
> )

Here, you might use a test driven by a simple CMake script:

CMAKE_MINIMUM_REQUIRED(VERSION 2.8 FATAL_ERROR)
PROJECT(BOUNCYBALL C)
ENABLE_TESTING()
FILE(WRITE ${CMAKE_BINARY_DIR}/bouncyball.out "bouncyball\n")
FILE(WRITE ${CMAKE_BINARY_DIR}/bouncyball.cmake "
EXECUTE_PROCESS(
    COMMAND \${EXEC} COMMAND diff - \${FILE} RESULT_VARIABLE RESULT
)
IF(NOT RESULT EQUAL 0)
    MESSAGE(FATAL_ERROR)
ENDIF()
")
FILE(WRITE ${CMAKE_BINARY_DIR}/bouncyball.c "
#include <stdio.h>
int main(void){
    printf(\"bouncyball\\n\");
    return 0;
}
")
ADD_EXECUTABLE(bouncyball bouncyball.c)
ADD_TEST(NAME bouncyball
    COMMAND ${CMAKE_COMMAND}
    -DEXEC=$<TARGET_FILE:bouncyball>
    -DFILE=${CMAKE_BINARY_DIR}/bouncyball.out
    -P ${CMAKE_BINARY_DIR}/bouncyball.cmake
)

After configuration, if you edit bouncyball.out you can see the test
pass or fail, depending on its contents; use "make test" or "ctest".

Regards,

Michael

> I hope I did provide   the example unix Makefile     that is being translated.
> 
> thanks
> and
> regards
> 
>> On Nov 7, 2010, at 6:08 AM, luxInteg wrote:
>>> Greetings,
>>>
>>> I am learning cmake. and I have taken the following from an old
>>> Makefile:- INC = ../include/BouncyBall.h
>>>
>>> BouncyBall: BouncyBall.c library $(INC)
>>>
>>> 	${CC} ${CFLAGS}  -o BouncyBall BouncyBall.c ../lib/libOLD.a
>>> 	./BouncyBall > my_BouncyBall.out  - diff BouncyBall.out
>>> 	my_BouncyBall.out
>>>
>>> and  'translated'   for cmake  as the following:-
>>> -----------------------
>>> add_executable(BouncyBall BouncyBall.c)
>>> find_library(OLD_LIBRARY OLD)
>>> target_link_libraries(BouncyBall ${OLD_LIBRARY})
>>> COMMAND(./BouncyBall > my_BouncyBall.out
>>>
>>> 	- diff BouncyBall.out my_BouncyBall.out)
>>>
>>> install(TARGETS
>>> BouncyBall
>>> BouncyBall.out
>>> my_BouncyBall.out
>>> DESTINATION bin)
>>> -----------------------
>>> but it does not work
>>>
>>> advice would be appreciated
>>>
>>> sincerely
>>> luxInteg