Hi,
The documentation says
> A package-specific list of components may be listed after the REQUIRED
> option or after the COMPONENTS option if no REQUIRED option is given.
http://www.cmake.org/cmake/help/cmake-2-8-docs.html#command:find_package
But it doesn't say why you would want to do that. At first I thought it was
to specify that only the components specified would be used to fill cmake
variables. However, find_package(Qt COMPONENTS QtCore) also results in
${QT_QTGUI_LIBRARY} being defined for example. So then I thought maybe the
semantic is that if one of the components can not be found, the find_package
fails. So I tried find_package(Qt REQUIRED QtCore QtDoesNotExist) which
works without error.
What am I missing?
The reason I ask is that I finally figured out why the tests in my library
needed to be linked to QtGui, even though it only uses QtCore.
The reason is that find_package(Qt) causes QT_GUI_LIB to be defined. Which
in turn causes QTEST_MAIN to be defined to expand to use QApplication
instead of QCoreApplication as it is if QT_GUI_LIB is not defined.
http://qt.gitorious.org/qt/qt/blobs/4.7/src/testlib/qtest.h
find_package(Qt REQUIRED QtCore QtScript) does not cause QT_GUI_LIB to be
defined. However, some of my targets do need QtGui, so I should specify it,
right?
So if I do specify it I'll end up having QT_GUI_LIB defined when building my
unit tests. I could remove_definitions(-DQT_GUI_LIB), but apart from being a
BadHack(tm), it causes my unit tests which *do* require QtGui to fail at
runtime because they create QWidgets and by undeffing QT_GUI_LIB I build
them to use QCoreApplication instead of QApplication (Not allowed in Qt), so
the tests fail at runtime.
http://gitorious.org/grantlee/grantlee/blobs/0.1/tests/CMakeLists.txt
Is there a solution to all this? What is the point of COMPONENTS if it has
no effect on what I can include or link to? Is it possible to link some of
my tests to QtGui but not all of them and still have them all pass? Do I
need to just link my core tests to QtGui and use QApplication and quit my
complaining?
The only way I can see to satisfy all requirements is attached. Is that
acceptable or is there a better way?
All the best,
Steve.
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index aef989e..8709213 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -17,6 +17,8 @@ configure_file(grantlee_paths.h.cmake ${PROJECT_BINARY_DIR}/grantlee_paths.h)
set (_rcc_file "scriptedtags.qrc")
qt4_add_resources(_scripted_rcc_src ${_rcc_file} OPTIONS -root "/plugins/grantlee/${Grantlee_MAJOR_MINOR_VERSION_STRING}" )
+remove_definitions(-DQT_GUI_LIB)
+
macro(GRANTLEE_CORE_UNIT_TESTS)
foreach(_testname ${ARGN})
set(_testSrcs ${_testname}.cpp)
@@ -24,13 +26,14 @@ macro(GRANTLEE_CORE_UNIT_TESTS)
qt4_generate_moc(${_testname}.cpp ${moc_output_file})
add_executable(${_testname}_exec ${_testSrcs} ${moc_output_file} ${_scripted_rcc_src} ${CMAKE_SOURCE_DIR}/corelib/lexer.cpp)
add_test(${_testname} ${_testname}_exec )
- target_link_libraries(${_testname}_exec ${QT_QTTEST_LIBRARY} ${QT_QTGUI_LIBRARY} ${Grantlee_CORE_LIBRARIES} )
+ target_link_libraries(${_testname}_exec ${QT_QTTEST_LIBRARY} ${Grantlee_CORE_LIBRARIES} )
endforeach(_testname)
endmacro(GRANTLEE_CORE_UNIT_TESTS)
macro(GRANTLEE_GUI_UNIT_TESTS)
foreach(_testname ${ARGN})
set(_testSrcs ${_testname}.cpp)
+ set_source_files_properties(${_testSrcs} PROPERTIES COMPILE_FLAGS "-DQT_GUI_LIB" )
set(moc_output_file "${CMAKE_CURRENT_BINARY_DIR}/${_testname}.moc")
qt4_generate_moc(${_testname}.cpp ${moc_output_file})
add_executable(${_testname}_exec ${_testSrcs} ${moc_output_file} )
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