[CMake] sip, pyqt, and linking

[luxInteg]

Greetings 

consider my small   'learn  cmake/qt4  project' 
It generates a  library   testLIB-static   in $CMAKE_SOURCE_DIR}/testLIB
and an executible testBIN in  ${CMAKE_SOURCE_DIR}/upstream/bin


A) For the library I used
add_library(testLIB-static    testLIB.cpp )


B) For the executible 
I use the sip generator to  generate  code like so


add_custom_command(OUTPUT 
 ${CMAKE_CURRENT_BINARY_DIR}/generatedfile1.cpp
  ----
  ---
 COMMAND ${SIP_EXECUTABLE} 
-c${CMAKE_CURRENT_BINARY_DIR}    
-I${SIP_PATH} 
-s ".cpp"
-t WS_X11 -t Qt$version -w

  ${CMAKE_SOURCE_DIR}/path/to/generator.sip
DEPENDS ${CMAKE_SOURCE_DIR}/path/to/generator.sip
MAIN_DEPENDENCY ${CMAKE_SOURCE_DIR}/path/to/generator.sip
  COMMENT "Processing ${CMAKE_SOURCE_DIR}/path/to/generator.sip" 
VERBATIM )


add_execitible(testBIN 
testBIN.cpp
generatedfile1.cpp )

target_link_libraries(testLIB-static)

###############  these are my findings

----If I add   find_library(XXX  testLIB-static)  before I use the 
add_executible()  command cmake contends  that  testLIB-static is set to 
NOTFOUND.
----If I do not use find_library(XXX  testLIB-static)  and run make,   make 
goes to 100 per cent and then all hell breaks  loose with  linking problems.

If I  change the second line of the add_custom_command()  statement to use 
'absolute paths that I can understand such as:-

${CMAKE_SOURCE_DIR}/upstream/bin/generatedfile1.cpp  the SIP generator fails  
to generate  generatedfile1.cpp



Advice ould be appreciated.

luxInteg