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CMake: add some docs for qt_find_package

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For -developer-buildS qt_find_package caches which packages were found
on the first configuration, to make the build system pick up a newly
added qt_find_package call one needs to follow one of the methods
that are now mentioned in the docs.

Hugely based on commit message from commit
6847a19e3edc76cce6ca0f0c25e520db591cedb9.

Change-Id: I4a13d3c97a6172f504a57298c4b3edee30d21250
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
This commit is contained in:
Ahmad Samir 2023-03-27 12:47:42 +02:00
parent 80c1406371
commit 396e6daea4
1 changed files with 9 additions and 0 deletions
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cmake/QtFindPackageHelpers.cmake
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@ -16,6 +16,15 @@ function(qt_find_package_promote_targets_to_global_scope target)
"qt_find_package_targets_dict" "promote_global") "qt_find_package_targets_dict" "promote_global")
endfunction() endfunction()
# As an optimization when using -developer-build, qt_find_package records which
# packages were found during the initial configuration. Then on subsequent
# reconfigurations it skips looking for packages that were not found on the
# initial run.
# For the build system to pick up a newly added qt_find_package call, you need to:
# - Start with a clean build dir
# - Or remove the <builddir>/CMakeCache.txt file and configure from scratch
# - Or remove the QT_INTERNAL_PREVIOUSLY_FOUND_PACKAGES cache variable (by
# editing CMakeCache.txt) and reconfigure.
macro(qt_find_package) macro(qt_find_package)
# Get the target names we expect to be provided by the package. # Get the target names we expect to be provided by the package.
set(find_package_options CONFIG NO_MODULE MODULE REQUIRED) set(find_package_options CONFIG NO_MODULE MODULE REQUIRED)