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CMake: Allow find_package(Qt6 COMPONENTS Foo) in tests

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In prefix builds of non-qtbase repositories, calls to find_package(Qt6
COMPONENT Foo) did not work in tests, because the find_package calls in
Qt6Config.cmake use NO_DEFAULT_PATH, and thus CMAKE_PREFIX_PATH is
ignored.

Non-external-project examples had the same problem. This was fixed by
ffe0889413 which introduced the variable
QT_EXAMPLES_CMAKE_PREFIX_PATH as additional parameter in all relevant
find_package calls.

We now set this variable in qt_build_tests where it should be local to
the tests directory and its children.

We cannot use QT_ADDITIONAL_PACKAGES_PREFIX_PATH, because it's value is
read once and cached in Qt6Config.cmake - we would have to clear the
internal cache variable.

It would probably be good to rename QT_EXAMPLES_CMAKE_PREFIX_PATH to
reflect that it's not just used for examples. However, my naming skills
are drained for today.

Task-number: QTBUG-88264
Change-Id: I8bcfe9b7f2ee1f1b75dc725977924d09cb36822c
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
Reviewed-by: Alexey Edelev <alexey.edelev@qt.io>
This commit is contained in:
Joerg Bornemann 2023-08-18 17:33:21 +02:00
parent b684984939
commit 2ab80a2c18
1 changed files with 4 additions and 0 deletions
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4
cmake/QtBuildInternals/QtBuildInternalsConfig.cmake
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@ -717,6 +717,10 @@ endfunction()
macro(qt_build_tests)
set(CMAKE_UNITY_BUILD OFF)
# Prepending to QT_EXAMPLES_CMAKE_PREFIX_PATH helps find components of Qt6, because those
# find_package calls use NO_DEFAULT_PATH, and thus CMAKE_PREFIX_PATH is ignored.
list(PREPEND QT_EXAMPLES_CMAKE_PREFIX_PATH "${QT_BUILD_DIR}/${INSTALL_LIBDIR}/cmake")
if(QT_BUILD_STANDALONE_TESTS)
# Find location of TestsConfig.cmake. These contain the modules that need to be
# find_package'd when testing.