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CMake: Fix qt_find_package to work when CMP00126 is set to NEW

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When CMP00126 is set to NEW, set(CACHE) doesn't remove regular
variable bindings with the same name as the cache variable.

This introduced an issue in qt_find_package, which called
find_package(CONFIG QUIET) to try and find a package config file, but
did not clean up the non-cache _FOUND variable which is automatically
set to 0 by CMake if no Config file is found.

Make sure to unset both the regular and cache _FOUND variables if either
the package config file was not found, or if none of the provided
targets found even if the Config file was found.

Also move the _DIR cache variable cleaning into the same code block.

Amends 4c31ce68d5
Amends 34b1c1c23c

Fixes: QTBUG-95635
Pick-to: 6.2
Change-Id: I871987217526e0f0a20038a8da52625838e49488
Reviewed-by: Craig Scott <craig.scott@qt.io>
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
This commit is contained in:
Alexandru Croitor 2021-08-06 18:39:04 +02:00
parent 32725806c8
commit 72a1e55472
1 changed files with 20 additions and 12 deletions
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32
cmake/QtFindPackageHelpers.cmake
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@ -86,16 +86,31 @@ macro(qt_find_package)
# in their own way. CMake has FindSQLite3.cmake and with the original
# qt_find_package(SQLite3) call it is our intention to use the cmake package
# in module mode.
if (${ARGV0}_FOUND AND arg_PROVIDED_TARGETS)
unset(any_target_found)
unset(_qt_any_target_found)
unset(_qt_should_unset_found_var)
if(${ARGV0}_FOUND AND arg_PROVIDED_TARGETS)
foreach(expected_target ${arg_PROVIDED_TARGETS})
if (TARGET ${expected_target})
set(any_target_found TRUE)
set(_qt_any_target_found TRUE)
break()
endif()
endforeach()
if(NOT any_target_found)
unset(${ARGV0}_FOUND)
if(NOT _qt_any_target_found)
set(_qt_should_unset_found_var TRUE)
endif()
endif()
# If we consider the package not to be found, make sure to unset both regular
# and CACHE vars, otherwise CMP0126 set to NEW might cause issues with
# packages not being found correctly.
if(NOT ${ARGV0}_FOUND OR _qt_should_unset_found_var)
unset(${ARGV0}_FOUND)
unset(${ARGV0}_FOUND CACHE)
# Unset the NOTFOUND ${package}_DIR var that might have been set by the previous
# find_package call, to get rid of "not found" messages in the feature summary
# if the package is found by the next find_package call.
if(DEFINED CACHE{${ARGV0}_DIR} AND NOT ${ARGV0}_DIR)
unset(${ARGV0}_DIR CACHE)
endif()
endif()
endif()
@ -111,13 +126,6 @@ macro(qt_find_package)
# E.g. find_package(Qt6 COMPONENTS BuildInternals) followed by
# qt_find_package(Qt6 COMPONENTS Core) doesn't end up calling find_package(Qt6Core).
if (NOT ${ARGV0}_FOUND AND NOT _qt_find_package_skip_find_package)
# Unset the NOTFOUND ${package}_DIR var that might have been set by the previous
# find_package call, to get rid of "not found" messagees in the feature summary
# if the package is found by the next find_package call.
if(DEFINED CACHE{${ARGV0}_DIR} AND NOT ${ARGV0}_DIR)
unset(${ARGV0}_DIR CACHE)
endif()
# Call original function without our custom arguments.
find_package(${arg_UNPARSED_ARGUMENTS})
endif()