CMake: Extract package dependency finding into functions

Aside from moving the code to reduce duplication, the only changes in
the code are the replacement of @target@ to ${target}, using IN LISTS
with variable names to avoid macro expansion issues and replacing
the if(var) conditions with double variable evaluation
+ NOT STREQUAL "".

The function implementations are now in the same order as they
are used in the Dependencies.cmake files.

Pick-to: 6.4
Task-number: QTBUG-104998
Change-Id: Iaae926414fd2a7cc09c2f5716376caaa0aade74b
Reviewed-by: Jörg Bornemann <joerg.bornemann@qt.io>

1 files changed, 79 insertions, 0 deletions

diff --git a/cmake/QtPublicDependencyHelpers.cmake b/cmake/QtPublicDependencyHelpers.cmake
index a1e422107a..eb41ff1e23 100644
--- a/cmake/QtPublicDependencyHelpers.cmake
+++ b/cmake/QtPublicDependencyHelpers.cmake
@@ -1,3 +1,82 @@
+# Note that target_dep_list does not accept a list of values, but a var name that contains the
+# list of dependencies. See foreach block for reference.
+macro(_qt_internal_find_third_party_dependencies target target_dep_list)
+    foreach(__qt_${target}_target_dep IN LISTS ${target_dep_list})
+        list(GET __qt_${target}_target_dep 0 __qt_${target}_pkg)
+        list(GET __qt_${target}_target_dep 1 __qt_${target}_is_optional)
+        list(GET __qt_${target}_target_dep 2 __qt_${target}_version)
+        list(GET __qt_${target}_target_dep 3 __qt_${target}_components)
+        list(GET __qt_${target}_target_dep 4 __qt_${target}_optional_components)
+        set(__qt_${target}_find_package_args "${__qt_${target}_pkg}")
+        if(__qt_${target}_version)
+            list(APPEND __qt_${target}_find_package_args "${__qt_${target}_version}")
+        endif()
+        if(__qt_${target}_components)
+            string(REPLACE " " ";" __qt_${target}_components "${__qt_${target}_components}")
+            list(APPEND __qt_${target}_find_package_args COMPONENTS ${__qt_${target}_components})
+        endif()
+        if(__qt_${target}_optional_components)
+            string(REPLACE " " ";"
+                __qt_${target}_optional_components "${__qt_${target}_optional_components}")
+            list(APPEND __qt_${target}_find_package_args
+                 OPTIONAL_COMPONENTS ${__qt_${target}_optional_components})
+        endif()
+
+        if(__qt_${target}_is_optional)
+            if(${CMAKE_FIND_PACKAGE_NAME}_FIND_QUIETLY)
+                list(APPEND __qt_${target}_find_package_args QUIET)
+            endif()
+            find_package(${__qt_${target}_find_package_args})
+        else()
+            find_dependency(${__qt_${target}_find_package_args})
+        endif()
+    endforeach()
+endmacro()
+
+# Note that target_dep_list does not accept a list of values, but a var name that contains the
+# list of dependencies. See foreach block for reference.
+macro(_qt_internal_find_tool_dependencies target target_dep_list)
+    if(NOT "${${target_dep_list}}" STREQUAL "" AND NOT "${QT_HOST_PATH}" STREQUAL "")
+         # Make sure that the tools find the host tools first
+         set(BACKUP_${target}_CMAKE_PREFIX_PATH ${CMAKE_PREFIX_PATH})
+         set(BACKUP_${target}_CMAKE_FIND_ROOT_PATH ${CMAKE_FIND_ROOT_PATH})
+         list(PREPEND CMAKE_PREFIX_PATH "${QT_HOST_PATH_CMAKE_DIR}"
+             "${_qt_additional_host_packages_prefix_paths}")
+         list(PREPEND CMAKE_FIND_ROOT_PATH "${QT_HOST_PATH}"
+             "${_qt_additional_host_packages_root_paths}")
+    endif()
+
+    foreach(__qt_${target}_target_dep IN LISTS ${target_dep_list})
+        list(GET __qt_${target}_target_dep 0 __qt_${target}_pkg)
+        list(GET __qt_${target}_target_dep 1 __qt_${target}_version)
+
+        unset(__qt_${target}_find_package_args)
+        if(${CMAKE_FIND_PACKAGE_NAME}_FIND_QUIETLY)
+            list(APPEND __qt_${target}_find_package_args QUIET)
+        endif()
+        if(${CMAKE_FIND_PACKAGE_NAME}_FIND_REQUIRED)
+            list(APPEND __qt_${target}_find_package_args REQUIRED)
+        endif()
+        find_package(${__qt_${target}_pkg}
+            ${__qt_${target}_version}
+            ${__qt_${target}_find_package_args}
+            PATHS
+                ${_qt_additional_packages_prefix_paths}
+        )
+        if (NOT ${__qt_${target}_pkg}_FOUND)
+            if(NOT "${QT_HOST_PATH}" STREQUAL "")
+                 set(CMAKE_PREFIX_PATH ${BACKUP_${target}_CMAKE_PREFIX_PATH})
+                 set(CMAKE_FIND_ROOT_PATH ${BACKUP_${target}_CMAKE_FIND_ROOT_PATH})
+            endif()
+            return()
+        endif()
+    endforeach()
+    if(NOT "${${target_dep_list}}" STREQUAL "" AND NOT "${QT_HOST_PATH}" STREQUAL "")
+         set(CMAKE_PREFIX_PATH ${BACKUP_${target}_CMAKE_PREFIX_PATH})
+         set(CMAKE_FIND_ROOT_PATH ${BACKUP_${target}_CMAKE_FIND_ROOT_PATH})
+    endif()
+endmacro()
+
 # Please note the target_dep_list accepts not the actual list values but the list names that
 # contain preformed dependencies. See foreach block for reference.
 # The same applies for find_dependency_path_list.