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qtbase/cmake/QtBuildRepoExamplesHelpers.cmake
Alexandru Croitor db58564f4f CMake: Unset DESTDIR when installing non-standalone examples 
When QT_INTERNAL_EXAMPLES_INSTALL_PREFIX is set, the build system
should ignore the DESTDIR env var when installing examples. Otherwise
the examples will still be installed into a location where the Coin
agent will archive the files, and thus blow up the package size,
especially if each example contains deployed Qt libraries.

Backup and temporarily unset the DESTDIR env var while example
installation is in progress.

Amends 02cb165ef8050230b477358e4136e9f0acd83eb6
Amends 7694b01aafd52b7064161b2f8c9a98cd330d24d3

Task-number: QTBUG-90820
Task-number: QTBUG-96232
Change-Id: Ibe24a88dd672d246b579d815a813dd042f60e6a6
Reviewed-by:  Alexey Edelev <alexey.edelev@qt.io>
(cherry picked from commit 90db9a41566f0fdb26b7a80b68b55ac0360489f0)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
2024-08-07 17:30:07 +00:00

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CMake
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# Copyright (C) 2023 The Qt Company Ltd.
# SPDX-License-Identifier: BSD-3-Clause
macro(qt_examples_build_begin)
set(options EXTERNAL_BUILD)
set(singleOpts "")
set(multiOpts DEPENDS)
cmake_parse_arguments(arg "${options}" "${singleOpts}" "${multiOpts}" ${ARGN})
# Examples are not unity-ready.
set(CMAKE_UNITY_BUILD OFF)
# Skip running deployment steps when the developer asked to deploy a minimal subset of examples.
# Each example can then decide whether it wants to be deployed as part of the minimal subset
# by unsetting the QT_INTERNAL_SKIP_DEPLOYMENT variable before its qt_internal_add_example call.
# This will be used by our CI.
if(NOT DEFINED QT_INTERNAL_SKIP_DEPLOYMENT AND QT_DEPLOY_MINIMAL_EXAMPLES)
set(QT_INTERNAL_SKIP_DEPLOYMENT TRUE)
endif()
# Use by qt_internal_add_example.
set(QT_EXAMPLE_BASE_DIR "${CMAKE_CURRENT_SOURCE_DIR}")
if(QT_BUILD_STANDALONE_EXAMPLES)
# Find all qt packages, so that the various if(QT_FEATURE_foo) add_subdirectory()
# conditions have correct values, regardless whether we will use ExternalProjects or not.
qt_internal_find_standalone_parts_config_files()
endif()
string(TOLOWER ${PROJECT_NAME} project_name_lower)
if(arg_EXTERNAL_BUILD AND QT_BUILD_EXAMPLES_AS_EXTERNAL)
# Examples will be built using ExternalProject.
# We depend on all plugins built as part of the current repo as well as current repo's
# dependencies plugins, to prevent opportunities for
# weird errors associated with loading out-of-date plugins from
# unrelated Qt modules.
# We also depend on all targets from this repo's src and tools subdirectories
# to ensure that we've built anything that a find_package() call within
# an example might use. Projects can add further dependencies if needed,
# but that should rarely be necessary.
set(QT_EXAMPLE_DEPENDENCIES ${qt_repo_plugins_recursive} ${arg_DEPENDS})
if(TARGET ${qt_repo_targets_name}_src)
list(APPEND QT_EXAMPLE_DEPENDENCIES ${qt_repo_targets_name}_src_for_examples)
endif()
if(TARGET ${qt_repo_targets_name}_tools)
list(APPEND QT_EXAMPLE_DEPENDENCIES ${qt_repo_targets_name}_tools)
endif()
set(QT_IS_EXTERNAL_EXAMPLES_BUILD TRUE)
if(NOT TARGET examples)
if(QT_BUILD_EXAMPLES_BY_DEFAULT)
add_custom_target(examples ALL)
else()
add_custom_target(examples)
endif()
endif()
if(NOT TARGET examples_${project_name_lower})
add_custom_target(examples_${project_name_lower})
add_dependencies(examples examples_${project_name_lower})
endif()
include(ExternalProject)
else()
# This repo has not yet been updated to build examples in a separate
# build from this main build, or we can't use that arrangement yet.
# Build them directly as part of the main build instead for backward
# compatibility.
if(NOT BUILD_SHARED_LIBS)
# Ordinarily, it would be an error to call return() from within a
# macro(), but in this case we specifically want to return from the
# caller's scope if we are doing a static build and the project
# isn't building examples in a separate build from the main build.
# Configuring static builds requires tools that are not available
# until build time.
return()
endif()
if(NOT QT_BUILD_EXAMPLES_BY_DEFAULT)
set_directory_properties(PROPERTIES EXCLUDE_FROM_ALL TRUE)
endif()
endif()
# TODO: Change this to TRUE when all examples in all repos are ported to use
# qt_internal_add_example.
# We shouldn't need to call qt_internal_set_up_build_dir_package_paths when
# QT_IS_EXTERNAL_EXAMPLES_BUILD is TRUE.
# Due to not all examples being ported, if we don't
# call qt_internal_set_up_build_dir_package_paths -> set(QT_NO_CREATE_TARGETS TRUE) we'll get
# CMake configuration errors saying we redefine Qt targets because we both build them and find
# them as part of find_package.
set(__qt_all_examples_ported_to_external_projects FALSE)
# Examples that are built as part of the Qt build need to use the CMake config files from the
# build dir, because they are not installed yet in a prefix build.
# Prepending to CMAKE_PREFIX_PATH helps find the initial Qt6Config.cmake.
# Prepending to QT_BUILD_CMAKE_PREFIX_PATH helps find components of Qt6, because those
# find_package calls use NO_DEFAULT_PATH, and thus CMAKE_PREFIX_PATH is ignored.
# Prepending to CMAKE_FIND_ROOT_PATH ensures the components are found while cross-compiling
# without setting CMAKE_FIND_ROOT_PATH_MODE_PACKAGE to BOTH.
if(NOT QT_IS_EXTERNAL_EXAMPLES_BUILD OR NOT __qt_all_examples_ported_to_external_projects)
qt_internal_set_up_build_dir_package_paths()
list(PREPEND CMAKE_FIND_ROOT_PATH "${QT_BUILD_DIR}")
list(PREPEND QT_BUILD_CMAKE_PREFIX_PATH "${QT_BUILD_DIR}/${INSTALL_LIBDIR}/cmake")
endif()
# Because CMAKE_INSTALL_RPATH is empty by default in the repo project, examples need to have
# it set here, so they can run when installed.
# This means that installed examples are not relocatable at the moment. We would need to
# annotate where each example is installed to, to be able to derive a relative rpath, and it
# seems there's no way to query such information from CMake itself.
set(CMAKE_INSTALL_RPATH "${_default_install_rpath}")
install(CODE "
# Backup CMAKE_INSTALL_PREFIX because we're going to change it in each example subdirectory
# and restore it after all examples are processed so that QtFooToolsAdditionalTargetInfo.cmake
# files are installed into the original install prefix.
set(_qt_internal_examples_cmake_install_prefix_backup \"\${CMAKE_INSTALL_PREFIX}\")
")
# Backup the DESTDIR and unset it, so that example installation is not affected by DESTDIR.
# This is activated by our CI when QT_INTERNAL_EXAMPLES_INSTALL_PREFIX is set.
if(QT_INTERNAL_EXAMPLES_INSTALL_PREFIX)
set(_qt_examples_should_unset_destdir TRUE)
else()
set(_qt_examples_should_unset_destdir FALSE)
endif()
set_property(GLOBAL PROPERTY
_qt_examples_should_unset_destdir_${project_name_lower}
"${_qt_examples_should_unset_destdir}")
if(_qt_examples_should_unset_destdir)
install(CODE "
# Temporarily unset DESTDIR while examples are being installed.
set(_qt_internal_examples_destdir_backup \"\$ENV{DESTDIR}\")
unset(ENV{DESTDIR})
")
endif()
unset(_qt_examples_should_unset_destdir)
unset(project_name_lower)
endmacro()
macro(qt_examples_build_end)
# We use AUTOMOC/UIC/RCC in the examples. When the examples are part of the
# main build rather than being built in their own separate project, make
# sure we do not fail on a fresh Qt build (e.g. the moc binary won't exist
# yet because it is created at build time).
_qt_internal_collect_buildsystem_targets(targets
"${CMAKE_CURRENT_SOURCE_DIR}" EXCLUDE UTILITY ALIAS)
foreach(target ${targets})
qt_autogen_tools(${target} ENABLE_AUTOGEN_TOOLS "moc" "rcc")
if(TARGET Qt::Widgets)
qt_autogen_tools(${target} ENABLE_AUTOGEN_TOOLS "uic")
endif()
set_target_properties(${target} PROPERTIES UNITY_BUILD OFF)
endforeach()
install(CODE "
# Restore backed up CMAKE_INSTALL_PREFIX.
set(CMAKE_INSTALL_PREFIX \"\${_qt_internal_examples_cmake_install_prefix_backup}\")
")
set(CMAKE_UNITY_BUILD ${QT_UNITY_BUILD})
string(TOLOWER ${PROJECT_NAME} project_name_lower)
get_property(_qt_examples_should_unset_destdir
GLOBAL PROPERTY _qt_examples_should_unset_destdir_${project_name_lower})
if(_qt_examples_should_unset_destdir)
install(CODE "
# Restore the DESTDIR env var after examples have been installed.
set(ENV{DESTDIR} \"\${_qt_internal_examples_destdir_backup}\")
unset(_qt_internal_examples_destdir_backup)
")
endif()
unset(_qt_examples_should_unset_destdir)
unset(project_name_lower)
endmacro()
# Allows building an example either as an ExternalProject or in-tree with the Qt build.
# Also allows installing the example sources.
function(qt_internal_add_example subdir)
# Don't show warnings for examples that were added via qt_internal_add_example.
# Those that are added via add_subdirectory will see the warning, due to the parent scope
# having the variable set to TRUE.
if(QT_FEATURE_developer_build AND NOT QT_NO_WARN_ABOUT_EXAMPLE_ADD_SUBDIRECTORY_WARNING)
set(QT_WARN_ABOUT_EXAMPLE_ADD_SUBDIRECTORY FALSE)
endif()
# Pre-compute unique example name based on the subdir, in case of target name clashes.
qt_internal_get_example_unique_name(unique_example_name "${subdir}")
# QT_INTERNAL_NO_CONFIGURE_EXAMPLES is not meant to be used by Qt builders, it's here for faster
# testing of the source installation code path for build system engineers.
if(NOT QT_INTERNAL_NO_CONFIGURE_EXAMPLES)
if(NOT QT_IS_EXTERNAL_EXAMPLES_BUILD)
qt_internal_add_example_in_tree("${subdir}")
else()
qt_internal_add_example_external_project("${subdir}"
NAME "${unique_example_name}")
endif()
endif()
if(QT_INSTALL_EXAMPLES_SOURCES)
string(TOLOWER ${PROJECT_NAME} project_name_lower)
qt_internal_install_example_sources("${subdir}"
NAME "${unique_example_name}"
REPO_NAME "${project_name_lower}")
endif()
endfunction()
# Gets the install prefix where an example should be installed.
# Used for computing the final installation path.
function(qt_internal_get_example_install_prefix out_var)
# Allow customizing the installation path of the examples. Will be used in CI.
if(QT_INTERNAL_EXAMPLES_INSTALL_PREFIX)
set(qt_example_install_prefix "${QT_INTERNAL_EXAMPLES_INSTALL_PREFIX}")
elseif(QT_BUILD_STANDALONE_EXAMPLES)
# TODO: We might need to reset and pipe through an empty CMAKE_STAGING_PREFIX if we ever
# try to run standalone examples in the CI when cross-compiling, similar how it's done in
# qt_internal_set_up_fake_standalone_parts_install_prefix.
qt_internal_get_fake_standalone_install_prefix(qt_example_install_prefix)
else()
set(qt_example_install_prefix "${CMAKE_INSTALL_PREFIX}/${INSTALL_EXAMPLESDIR}")
endif()
file(TO_CMAKE_PATH "${qt_example_install_prefix}" qt_example_install_prefix)
set(${out_var} "${qt_example_install_prefix}" PARENT_SCOPE)
endfunction()
# Gets the install prefix where an example's sources should be installed.
# Used for computing the final installation path.
function(qt_internal_get_examples_sources_install_prefix out_var)
# Allow customizing the installation path of the examples source specifically.
if(QT_INTERNAL_EXAMPLES_SOURCES_INSTALL_PREFIX)
set(qt_example_install_prefix "${QT_INTERNAL_EXAMPLES_SOURCES_INSTALL_PREFIX}")
else()
qt_internal_get_example_install_prefix(qt_example_install_prefix)
endif()
file(TO_CMAKE_PATH "${qt_example_install_prefix}" qt_example_install_prefix)
set(${out_var} "${qt_example_install_prefix}" PARENT_SCOPE)
endfunction()
# Gets the relative path of an example, relative to the current repo's examples source dir.
# QT_EXAMPLE_BASE_DIR is meant to be already set in a parent scope.
function(qt_internal_get_example_rel_path out_var subdir)
file(RELATIVE_PATH example_rel_path
"${QT_EXAMPLE_BASE_DIR}" "${CMAKE_CURRENT_SOURCE_DIR}/${subdir}")
set(${out_var} "${example_rel_path}" PARENT_SCOPE)
endfunction()
# Gets the install path where an example should be installed.
function(qt_internal_get_example_install_path out_var subdir)
qt_internal_get_example_install_prefix(qt_example_install_prefix)
qt_internal_get_example_rel_path(example_rel_path "${subdir}")
set(example_install_path "${qt_example_install_prefix}/${example_rel_path}")
set(${out_var} "${example_install_path}" PARENT_SCOPE)
endfunction()
# Gets the install path where an example's sources should be installed.
function(qt_internal_get_examples_sources_install_path out_var subdir)
qt_internal_get_examples_sources_install_prefix(qt_example_install_prefix)
qt_internal_get_example_rel_path(example_rel_path "${subdir}")
set(example_install_path "${qt_example_install_prefix}/${example_rel_path}")
set(${out_var} "${example_install_path}" PARENT_SCOPE)
endfunction()
# Get the unique name of an example project based on its subdir or explicitly given name.
# Makes the name unique by appending a short sha1 hash of the relative path of the example
# if a target of the same name already exist.
function(qt_internal_get_example_unique_name out_var subdir)
qt_internal_get_example_rel_path(example_rel_path "${subdir}")
set(name "${subdir}")
# qtdeclarative has calls like qt_internal_add_example(imagine/automotive)
# so passing a nested subdirectory. Custom targets (and thus ExternalProjects) can't contain
# slashes, so extract the last part of the path to be used as a name.
if(name MATCHES "/")
string(REPLACE "/" ";" exploded_path "${name}")
list(POP_BACK exploded_path last_dir)
if(NOT last_dir)
message(FATAL_ERROR "Example subdirectory must have a name.")
else()
set(name "${last_dir}")
endif()
endif()
# Likely a clash with an example subdir ExternalProject custom target of the same name in a
# top-level build.
if(TARGET "${name}")
string(SHA1 rel_path_hash "${example_rel_path}")
string(SUBSTRING "${rel_path_hash}" 0 4 short_hash)
set(name "${name}-${short_hash}")
endif()
set(${out_var} "${name}" PARENT_SCOPE)
endfunction()
# Use old non-ExternalProject approach, aka build in-tree with the Qt build.
function(qt_internal_add_example_in_tree subdir)
# Unset the default CMAKE_INSTALL_PREFIX that's generated in
# ${CMAKE_CURRENT_BINARY_DIR}/cmake_install.cmake
# so we can override it with a different value in
# ${CMAKE_CURRENT_BINARY_DIR}/${subdir}/cmake_install.cmake
#
install(CODE "
# Unset the CMAKE_INSTALL_PREFIX in the current cmake_install.cmake file so that it can be
# overridden in the included add_subdirectory-specific cmake_install.cmake files instead.
# Also unset the deployment prefix, so it can be recomputed for each example subdirectory.
unset(CMAKE_INSTALL_PREFIX)
unset(QT_DEPLOY_PREFIX)
")
# Override the install prefix in the subdir cmake_install.cmake, so that
# relative install(TARGETS DESTINATION) calls in example projects install where we tell them to.
qt_internal_get_example_install_path(example_install_path "${subdir}")
set(CMAKE_INSTALL_PREFIX "${example_install_path}")
# Make sure unclean example projects have their INSTALL_EXAMPLEDIR set to "."
# Won't have any effect on example projects that don't use INSTALL_EXAMPLEDIR.
# This plus the install prefix above takes care of installing examples where we want them to
# be installed, while allowing us to remove INSTALL_EXAMPLEDIR code in each example
# incrementally.
# TODO: Remove once all repositories use qt_internal_add_example instead of add_subdirectory.
set(QT_INTERNAL_SET_EXAMPLE_INSTALL_DIR_TO_DOT ON)
add_subdirectory(${subdir})
endfunction()
function(qt_internal_add_example_external_project subdir)
set(options "")
set(singleOpts NAME)
set(multiOpts "")
cmake_parse_arguments(PARSE_ARGV 1 arg "${options}" "${singleOpts}" "${multiOpts}")
_qt_internal_get_build_vars_for_external_projects(
CMAKE_DIR_VAR qt_cmake_dir
PREFIXES_VAR qt_prefixes
ADDITIONAL_PACKAGES_PREFIXES_VAR qt_additional_packages_prefixes
)
list(APPEND QT_ADDITIONAL_PACKAGES_PREFIX_PATH "${qt_additional_packages_prefixes}")
set(vars_to_pass_if_defined)
set(var_defs)
if(QT_HOST_PATH OR CMAKE_CROSSCOMPILING)
list(APPEND var_defs
-DCMAKE_TOOLCHAIN_FILE:FILEPATH=${qt_cmake_dir}/qt.toolchain.cmake
)
else()
list(PREPEND CMAKE_PREFIX_PATH ${qt_prefixes})
# Setting CMAKE_SYSTEM_NAME affects CMAKE_CROSSCOMPILING, even if it is
# set to the same as the host, so it should only be set if it is different.
# See https://gitlab.kitware.com/cmake/cmake/-/issues/21744
if(NOT DEFINED CMAKE_TOOLCHAIN_FILE AND
NOT CMAKE_SYSTEM_NAME STREQUAL CMAKE_HOST_SYSTEM_NAME)
list(APPEND vars_to_pass_if_defined CMAKE_SYSTEM_NAME:STRING)
endif()
endif()
# We we need to augment the CMAKE_MODULE_PATH with the current repo cmake build dir, to find
# files like FindWrapBundledFooConfigExtra.cmake.
set(module_paths "${qt_prefixes}")
list(TRANSFORM module_paths APPEND "/${INSTALL_LIBDIR}/cmake/${QT_CMAKE_EXPORT_NAMESPACE}")
list(APPEND CMAKE_MODULE_PATH ${module_paths})
# Pass additional paths where qml plugin config files should be included by Qt6QmlPlugins.cmake.
# This is needed in prefix builds, where the cmake files are not installed yet.
set(glob_prefixes "${qt_prefixes}")
list(TRANSFORM glob_prefixes APPEND "/${INSTALL_LIBDIR}/cmake/${QT_CMAKE_EXPORT_NAMESPACE}Qml")
set(qml_plugin_cmake_config_file_glob_prefixes "")
foreach(glob_prefix IN LISTS glob_prefixes)
if(EXISTS "${glob_prefix}")
list(APPEND qml_plugin_cmake_config_file_glob_prefixes "${glob_prefix}")
endif()
endforeach()
if(qml_plugin_cmake_config_file_glob_prefixes)
set(QT_ADDITIONAL_QML_PLUGIN_GLOB_PREFIXES ${qml_plugin_cmake_config_file_glob_prefixes})
endif()
# In multi-config mode by default we exclude building tools for configs other than the main one.
# Trying to build an example in a non-default config using the non-installed
# QtFooConfig.cmake files would error out saying moc is not found.
# Make sure to build examples only with the main config.
# When users build an example against an installed Qt they won't have this problem because
# the generated non-main QtFooTargets-$<CONFIG>.cmake file is empty and doesn't advertise
# a tool that is not there.
if(QT_GENERATOR_IS_MULTI_CONFIG)
set(CMAKE_CONFIGURATION_TYPES "${QT_MULTI_CONFIG_FIRST_CONFIG}")
endif()
# We need to pass the modified CXX flags of the parent project so that using sccache works
# properly and doesn't error out due to concurrent access to the pdb files.
# See qt_internal_set_up_config_optimizations_like_in_qmake, "/Zi" "/Z7".
if(MSVC AND QT_FEATURE_msvc_obj_debug_info)
qt_internal_get_enabled_languages_for_flag_manipulation(enabled_languages)
set(configs RELWITHDEBINFO DEBUG)
foreach(lang ${enabled_languages})
foreach(config ${configs})
set(flag_var_name "CMAKE_${lang}_FLAGS_${config}")
list(APPEND vars_to_pass_if_defined "${flag_var_name}:STRING")
endforeach()
endforeach()
endif()
# When cross-compiling for a qemu target in our CI, we source an environment script
# that sets environment variables like CC and CXX. These are parsed by CMake on initial
# configuration to populate the cache vars CMAKE_${lang}_COMPILER.
# If the environment variable specified not only the compiler path, but also a list of flags
# to pass to the compiler, CMake parses those out into a separate CMAKE_${lang}_COMPILER_ARG1
# cache variable. In such a case, we want to ensure that the external project also sees those
# flags.
# Unfortunately we can't do that by simply forwarding CMAKE_${lang}_COMPILER_ARG1 to the EP
# because it breaks the compiler identification try_compile call, it simply doesn't consider
# the cache var. From what I could gather, it's a limitation of try_compile and the list
# of variables it considers for forwarding.
# To fix this case, we ensure not to pass either cache variable, and let the external project
# and its compiler identification try_compile project pick up the compiler and the flags
# from the environment variables instead.
foreach(lang_as_env_var CC CXX OBJC OBJCXX)
if(lang_as_env_var STREQUAL "CC")
set(lang_as_cache_var "C")
else()
set(lang_as_cache_var "${lang_as_env_var}")
endif()
set(lang_env_value "$ENV{${lang_as_env_var}}")
if(lang_env_value
AND CMAKE_${lang_as_cache_var}_COMPILER
AND CMAKE_${lang_as_cache_var}_COMPILER_ARG1)
# The compiler environment variable is set and specifies a list of extra flags, don't
# forward the compiler cache vars and rely on the environment variable to be picked up
# instead.
else()
list(APPEND vars_to_pass_if_defined "CMAKE_${lang_as_cache_var}_COMPILER:STRING")
endif()
endforeach()
unset(lang_as_env_var)
unset(lang_as_cache_var)
unset(lang_env_value)
list(APPEND vars_to_pass_if_defined
CMAKE_BUILD_TYPE:STRING
CMAKE_CONFIGURATION_TYPES:STRING
CMAKE_PREFIX_PATH:STRING
QT_BUILD_CMAKE_PREFIX_PATH:STRING
QT_ADDITIONAL_PACKAGES_PREFIX_PATH:STRING
QT_ADDITIONAL_QML_PLUGIN_GLOB_PREFIXES:STRING
QT_INTERNAL_SKIP_DEPLOYMENT:BOOL
CMAKE_FIND_ROOT_PATH:STRING
CMAKE_MODULE_PATH:STRING
BUILD_SHARED_LIBS:BOOL
CMAKE_OSX_ARCHITECTURES:STRING
CMAKE_OSX_DEPLOYMENT_TARGET:STRING
CMAKE_XCODE_ATTRIBUTE_CODE_SIGNING_ALLOWED:BOOL
CMAKE_XCODE_ATTRIBUTE_ONLY_ACTIVE_ARCH:BOOL
CMAKE_C_COMPILER_LAUNCHER:STRING
CMAKE_CXX_COMPILER_LAUNCHER:STRING
CMAKE_OBJC_COMPILER_LAUNCHER:STRING
CMAKE_OBJCXX_COMPILER_LAUNCHER:STRING
)
# QT_EXAMPLE_CMAKE_VARS_TO_PASS can be set by specific repos to pass any additional required
# CMake cache variables.
# One use case is passing locations of 3rd party package locations like Protobuf via _ROOT
# variables.
set(extra_vars_var_name "")
if(QT_EXAMPLE_CMAKE_VARS_TO_PASS)
set(extra_vars_var_name "QT_EXAMPLE_CMAKE_VARS_TO_PASS")
endif()
foreach(var_with_type IN LISTS vars_to_pass_if_defined ${extra_vars_var_name})
string(REPLACE ":" ";" key_as_list "${var_with_type}")
list(GET key_as_list 0 var)
if(NOT DEFINED ${var})
continue()
endif()
# Preserve lists
string(REPLACE ";" "$<SEMICOLON>" varForGenex "${${var}}")
list(APPEND var_defs -D${var_with_type}=${varForGenex})
endforeach()
if(QT_INTERNAL_VERBOSE_EXAMPLES)
list(APPEND var_defs -DCMAKE_MESSAGE_LOG_LEVEL:STRING=DEBUG)
list(APPEND var_defs -DCMAKE_AUTOGEN_VERBOSE:BOOL=TRUE)
endif()
set(deps "")
list(REMOVE_DUPLICATES QT_EXAMPLE_DEPENDENCIES)
foreach(dep IN LISTS QT_EXAMPLE_DEPENDENCIES)
if(TARGET ${dep})
list(APPEND deps ${dep})
endif()
endforeach()
set(independent_args)
cmake_policy(PUSH)
if(POLICY CMP0114)
set(independent_args INDEPENDENT TRUE)
cmake_policy(SET CMP0114 NEW)
endif()
# The USES_TERMINAL_BUILD setting forces the build step to the console pool
# when using Ninja. This has two benefits:
#
# - You see build output as it is generated instead of at the end of the
# build step.
# - Only one task can use the console pool at a time, so it effectively
# serializes all example build steps, thereby preventing CPU
# over-commitment.
#
# If the loss of interactivity is not so important, one can allow CPU
# over-commitment for Ninja builds. This may result in better throughput,
# but is not allowed by default because it can make a machine almost
# unusable while a compilation is running.
set(terminal_args USES_TERMINAL_BUILD TRUE)
if(CMAKE_GENERATOR MATCHES "Ninja")
option(QT_BUILD_EXAMPLES_WITH_CPU_OVERCOMMIT
"Allow CPU over-commitment when building examples (Ninja only)"
)
if(QT_BUILD_EXAMPLES_WITH_CPU_OVERCOMMIT)
set(terminal_args)
endif()
endif()
# QT_EXAMPLE_INSTALL_MARKER
# The goal is to install each example project into a directory that keeps the example source dir
# hierarchy, without polluting the example projects with dirty INSTALL_EXAMPLEDIR and
# INSTALL_EXAMPLESDIR usage.
# E.g. ensure qtbase/examples/widgets/widgets/wiggly is installed to
# $qt_example_install_prefix/examples/widgets/widgets/wiggly/wiggly.exe
# $qt_example_install_prefix defaults to ${CMAKE_INSTALL_PREFIX}/${INSTALL_EXAMPLEDIR}
# but can also be set to a custom location.
# This needs to work both:
# - when using ExternalProject to build examples
# - when examples are built in-tree as part of Qt (no ExternalProject).
# The reason we want to support the latter is for nicer IDE integration: a can developer can
# work with a Qt repo and its examples using the same build dir.
#
# In both case we have to ensure examples are not accidentally installed to $qt_prefix/bin or
# similar.
#
# Example projects installation matrix.
# 1) ExternalProject + unclean example install rules (INSTALL_EXAMPLEDIR is set) =>
# use _qt_internal_override_example_install_dir_to_dot + ExternalProject_Add's INSTALL_DIR
# using relative_dir from QT_EXAMPLE_BASE_DIR to example_source_dir
#
# 2) ExternalProject + clean example install rules =>
# use ExternalProject_Add's INSTALL_DIR using relative_dir from QT_EXAMPLE_BASE_DIR to
# example_source_dir, _qt_internal_override_example_install_dir_to_dot would be a no-op
#
# 3) in-tree + unclean example install rules (INSTALL_EXAMPLEDIR is set)
# +
# 4) in-tree + clean example install rules =>
# ensure CMAKE_INSTALL_PREFIX is unset in parent cmake_install.cmake file, set non-cache
# CMAKE_INSTALL_PREFIX using relative_dir from QT_EXAMPLE_BASE_DIR to
# example_source_dir, use _qt_internal_override_example_install_dir_to_dot to ensure
# INSTALL_EXAMPLEDIR does not interfere.
qt_internal_get_example_install_path(example_install_path "${subdir}")
set(ep_binary_dir "${CMAKE_CURRENT_BINARY_DIR}/${subdir}")
set(build_command "")
if(QT_INTERNAL_VERBOSE_EXAMPLES AND CMAKE_GENERATOR MATCHES "Ninja")
set(build_command BUILD_COMMAND "${CMAKE_COMMAND}" --build "." -- -v)
endif()
ExternalProject_Add(${arg_NAME}
EXCLUDE_FROM_ALL TRUE
SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/${subdir}"
PREFIX "${CMAKE_CURRENT_BINARY_DIR}/${subdir}-ep"
STAMP_DIR "${CMAKE_CURRENT_BINARY_DIR}/${subdir}-ep/stamp"
BINARY_DIR "${ep_binary_dir}"
INSTALL_DIR "${example_install_path}"
INSTALL_COMMAND ""
${build_command}
TEST_COMMAND ""
DEPENDS ${deps}
CMAKE_CACHE_ARGS ${var_defs}
-DCMAKE_INSTALL_PREFIX:STRING=<INSTALL_DIR>
-DQT_INTERNAL_SET_EXAMPLE_INSTALL_DIR_TO_DOT:BOOL=TRUE
${terminal_args}
)
# Install the examples when the the user runs 'make install', and not at build time (which is
# the default for ExternalProjects).
install(CODE "\
# Install example from inside ExternalProject into the main build's install prefix.
execute_process(
COMMAND
\"${CMAKE_COMMAND}\" --build \"${ep_binary_dir}\" --target install
)
")
# Force configure step to re-run after we configure the main project
set(reconfigure_check_file ${CMAKE_CURRENT_BINARY_DIR}/reconfigure_${arg_NAME}.txt)
file(TOUCH ${reconfigure_check_file})
ExternalProject_Add_Step(${arg_NAME} reconfigure-check
DEPENDERS configure
DEPENDS ${reconfigure_check_file}
${independent_args}
)
# Create an apk external project step and custom target that invokes the apk target
# within the external project.
# Make the global apk target depend on that custom target.
if(ANDROID)
ExternalProject_Add_Step(${arg_NAME} apk
COMMAND ${CMAKE_COMMAND} --build <BINARY_DIR> --target apk
DEPENDEES configure
EXCLUDE_FROM_MAIN YES
${terminal_args}
)
ExternalProject_Add_StepTargets(${arg_NAME} apk)
if(TARGET apk)
add_dependencies(apk ${arg_NAME}-apk)
endif()
endif()
cmake_policy(POP)
string(TOLOWER ${PROJECT_NAME} project_name_lower)
add_dependencies(examples_${project_name_lower} ${arg_NAME})
endfunction()
function(qt_internal_install_example_sources subdir)
set(options "")
set(single_args NAME REPO_NAME)
set(multi_args "")
cmake_parse_arguments(PARSE_ARGV 1 arg "${options}" "${single_args}" "${multi_args}")
qt_internal_get_examples_sources_install_path(example_install_path "${subdir}")
# The trailing slash is important to avoid duplicate nested directory names.
set(example_source_dir "${subdir}/")
# Allow controlling whether sources should be part of the default install target.
if(QT_INSTALL_EXAMPLES_SOURCES_BY_DEFAULT)
set(exclude_from_all "")
else()
set(exclude_from_all "EXCLUDE_FROM_ALL")
endif()
# Create an install component for all example sources. Can also be part of the default
# install target if EXCLUDE_FROM_ALL is not passed.
install(
DIRECTORY "${example_source_dir}"
DESTINATION "${example_install_path}"
COMPONENT "examples_sources"
USE_SOURCE_PERMISSIONS
${exclude_from_all}
)
# Also create a specific install component just for this repo's examples.
install(
DIRECTORY "${example_source_dir}"
DESTINATION "${example_install_path}"
COMPONENT "examples_sources_${arg_REPO_NAME}"
USE_SOURCE_PERMISSIONS
EXCLUDE_FROM_ALL
)
# Also create a specific install component just for the current example's sources.
install(
DIRECTORY "${example_source_dir}"
DESTINATION "${example_install_path}"
COMPONENT "examples_sources_${arg_NAME}"
USE_SOURCE_PERMISSIONS
EXCLUDE_FROM_ALL
)
endfunction()
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