CMake: Fix syncqt IMPORTED_LOCATION path for multi-config builds

When building examples as ExternalProjects as part of a multi-config
qtbase build, syncqt can not be located with the following error:

CMake Error at Qt6CoreToolsAdditionalTargetInfo.cmake:10 (message):
   Unable to add configure time executable Qt6::syncqt
   qtbase/libexec/syncqt doesn't exist
Call Stack (most recent call first):
  qtbase/lib/cmake/Qt6CoreTools/Qt6CoreToolsConfig.cmake:44 (include)
  qtbase/cmake/QtPublicDependencyHelpers.cmake:65 (find_package)
  qtbase/lib/cmake/Qt6Core/Qt6CoreDependencies.cmake:34
      (_qt_internal_find_tool_dependencies)
  qtbase/lib/cmake/Qt6Core/Qt6CoreConfig.cmake:42 (include)
  qtbase/lib/cmake/Qt6/Qt6Config.cmake:165 (find_package)
  CMakeLists.txt:13 (find_package)

The Qt6CoreToolsAdditionalTargetInfo.cmake file is used both for
install(EXPORT) Config files as well as export(EXPORT) Config files,
and in the latter case, the path that syncqt is looked up in is not
correct because syncqt is not yet installed.

In addition to checking whether syncqt exists in the install path,
also check if it exists in the build dir.

Ideally the additional path would be stored in a separate file that
is not installed, but the current code infrastructure does not provide
such a feature. Because we store a relative path instead of an
absolute path, the build path does not leak, so the situation is
bearable.

Task-number: QTBUG-90820
Task-number: QTBUG-96232
Change-Id: I16ad5c280751e050bc9b039ebd38ec9a66a6554c
Reviewed-by:  Alexey Edelev <alexey.edelev@qt.io>
(cherry picked from commit cc537d927b23a34296767fec8d3885a95f714255)
Reviewed-by:  Alexey Edelev <alexey.edelev@qt.io>

2 files changed, 26 insertions, 2 deletions

diff --git a/cmake/QtExecutableHelpers.cmake b/cmake/QtExecutableHelpers.cmake
index 736fea724e..f4380291f7 100644
--- a/cmake/QtExecutableHelpers.cmake
+++ b/cmake/QtExecutableHelpers.cmake
@@ -390,9 +390,15 @@ function(qt_internal_add_configure_time_executable target)
     if(arg_INSTALL_DIRECTORY)
         set(install_dir "${arg_INSTALL_DIRECTORY}")
     endif()
+
+    set(output_directory_relative "${install_dir}")
     set(output_directory "${QT_BUILD_DIR}/${install_dir}")
+
+    set(target_binary_path_relative
+        "${output_directory_relative}/${configuration_path}${target_binary}")
     set(target_binary_path
         "${output_directory}/${configuration_path}${target_binary}")
+
     get_filename_component(target_binary_path "${target_binary_path}" ABSOLUTE)
 
     if(NOT DEFINED arg_SOURCES)
@@ -521,7 +527,9 @@ function(qt_internal_add_configure_time_executable target)
     add_executable(${QT_CMAKE_EXPORT_NAMESPACE}::${target} ALIAS ${target})
     set_target_properties(${target} PROPERTIES
         _qt_internal_configure_time_target TRUE
-        IMPORTED_LOCATION "${target_binary_path}")
+        _qt_internal_configure_time_target_build_location "${target_binary_path_relative}"
+        IMPORTED_LOCATION "${target_binary_path}"
+    )
 
     if(NOT arg_NO_INSTALL)
         set_target_properties(${target} PROPERTIES
diff --git a/cmake/QtTargetHelpers.cmake b/cmake/QtTargetHelpers.cmake
index 71ffde93c0..631df93dc2 100644
--- a/cmake/QtTargetHelpers.cmake
+++ b/cmake/QtTargetHelpers.cmake
@@ -823,11 +823,19 @@ endif()
             # For Multi-config developer builds we should simply reuse IMPORTED_LOCATION of the
             # target.
             if(NOT QT_WILL_INSTALL AND QT_FEATURE_debug_and_release)
+                set(configure_time_target_build_location "")
                 get_target_property(configure_time_target_install_location ${target}
                     IMPORTED_LOCATION)
             else()
+                get_target_property(configure_time_target_build_location ${target}
+                    _qt_internal_configure_time_target_build_location)
+
+                set(configure_time_target_build_location
+                    "$\{PACKAGE_PREFIX_DIR}/${configure_time_target_build_location}")
+
                 get_target_property(configure_time_target_install_location ${target}
                     _qt_internal_configure_time_target_install_location)
+
                 set(configure_time_target_install_location
                     "$\{PACKAGE_PREFIX_DIR}/${configure_time_target_install_location}")
             endif()
@@ -835,7 +843,13 @@ endif()
                 string(APPEND content "
 # Import configure-time executable ${full_target}
 if(NOT TARGET ${full_target})
-    set(_qt_imported_location \"${configure_time_target_install_location}\")
+    set(_qt_imported_build_location \"${configure_time_target_build_location}\")
+    set(_qt_imported_install_location \"${configure_time_target_install_location}\")
+    set(_qt_imported_location \"\${_qt_imported_install_location}\")
+    if(NOT EXISTS \"$\{_qt_imported_location}\"
+          AND NOT \"$\{_qt_imported_build_location}\" STREQUAL \"\")
+        set(_qt_imported_location \"\${_qt_imported_build_location}\")
+    endif()
     if(NOT EXISTS \"$\{_qt_imported_location}\")
         message(FATAL_ERROR \"Unable to add configure time executable ${full_target}\"
             \" $\{_qt_imported_location} doesn't exists\")
@@ -846,6 +860,8 @@ if(NOT TARGET ${full_target})
         \"$\{_qt_imported_location}\")
     set_property(TARGET ${full_target} PROPERTY IMPORTED_GLOBAL TRUE)
     unset(_qt_imported_location)
+    unset(_qt_imported_build_location)
+    unset(_qt_imported_install_location)
 endif()
 \n")
             endif()