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Fix Standalone Example build when crosscompiling

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Added qt_examples_begin() and qt_examples_end() macros to setup the
example list so it can be re-used in other projects.

When cross-compiling, we also need to set
CMAKE_FIND_ROOT_PATH_MODE_PACKAGE to BOTH in order for find_package()
to work correctly.

Removed support for building the whole qtbase/examples folder as a
standalone project. Building examples is only supported when building
the whole of qtbase (qtbase + examples together) or each individual
example is built separately against an installed Qt version.

Change-Id: I9d26b94b48b95af230b76ab618becb21d2d45581
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
This commit is contained in:
Leander Beernaert 2019-06-06 13:08:41 +02:00
parent ac16a1228c
commit 053766d796
2 changed files with 33 additions and 36 deletions
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31
cmake/QtBuildInternals/QtBuildInternalsConfig.cmake
View File

@ -96,3 +96,34 @@ macro(qt_build_tests)
add_subdirectory(benchmarks)
endif()
endmacro()
macro(qt_examples_build_begin)
# It is part of a Qt build => Use the CMake config files from the binary dir
list(APPEND CMAKE_PREFIX_PATH "${CMAKE_BINARY_DIR}")
# Also make sure the CMake config files do not recreate the already-existing targets
set(QT_NO_CREATE_TARGETS TRUE)
set(BACKUP_CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ${CMAKE_FIND_ROOT_PATH_MODE_PACKAGE})
set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE "BOTH")
endmacro()
macro(qt_examples_build_end)
# We use AUTOMOC/UIC/RCC in the examples. Make sure to not fail on a fresh Qt build, that e.g. the moc binary does not exist yet.
# This function gets all targets below this directory
function(get_all_targets _result _dir)
get_property(_subdirs DIRECTORY "${_dir}" PROPERTY SUBDIRECTORIES)
foreach(_subdir IN LISTS _subdirs)
get_all_targets(${_result} "${_subdir}")
endforeach()
get_property(_sub_targets DIRECTORY "${_dir}" PROPERTY BUILDSYSTEM_TARGETS)
set(${_result} ${${_result}} ${_sub_targets} PARENT_SCOPE)
endfunction()
get_all_targets(targets "${CMAKE_CURRENT_SOURCE_DIR}")
foreach(target ${targets})
qt_autogen_tools(${target} ENABLE_AUTOGEN_TOOLS "moc" "uic" "rcc")
endforeach()
set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ${BACKUP_CMAKE_FIND_ROOT_PATH_MODE_PACKAGE})
endmacro()

38
examples/CMakeLists.txt
View File

@ -1,21 +1,6 @@
# special case begin
cmake_minimum_required(VERSION 3.14.0)
qt_examples_build_begin()
project(QtBaseExamples LANGUAGES CXX C ASM)
# Check whether this project is built as part of a Qt build
if (CMAKE_PROJECT_NAME STREQUAL "QtBaseExamples")
set(QT_STANDALONE_EXAMPLES_BUILD TRUE)
endif()
if (NOT QT_STANDALONE_EXAMPLES_BUILD)
# It is part of a Qt build => Use the CMake config files from the binary dir
list(APPEND CMAKE_PREFIX_PATH "${CMAKE_BINARY_DIR}")
# Also make sure the CMake config files do not recreate the already-existing targets
set(QT_NO_CREATE_TARGETS TRUE)
endif()
find_package(Qt5 COMPONENTS DBus Network Test Concurrent Sql Widgets Xml Gui)
# special case end
# Generated from examples.pro.
@ -65,24 +50,5 @@ if(TARGET Qt::Gui)
endif()
# special case begin
if (NOT QT_STANDALONE_EXAMPLES_BUILD)
# We use AUTOMOC/UIC/RCC in the examples. Make sure to not fail on a fresh Qt build, that e.g. the moc binary does not exist yet.
# This function gets all targets below this directory
function(get_all_targets _result _dir)
get_property(_subdirs DIRECTORY "${_dir}" PROPERTY SUBDIRECTORIES)
foreach(_subdir IN LISTS _subdirs)
get_all_targets(${_result} "${_subdir}")
endforeach()
get_property(_sub_targets DIRECTORY "${_dir}" PROPERTY BUILDSYSTEM_TARGETS)
set(${_result} ${${_result}} ${_sub_targets} PARENT_SCOPE)
endfunction()
get_all_targets(targets "${CMAKE_CURRENT_SOURCE_DIR}")
foreach(target ${targets})
qt_autogen_tools(${target} ENABLE_AUTOGEN_TOOLS "moc" "uic" "rcc")
endforeach()
endif()
qt_examples_build_end()
# special case end