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# SPDX-FileCopyrightText: 2021 Alexander Lohnau <alexander.lohnau@gmx.de>
#
# SPDX-License-Identifier: BSD-3-Clause
#[=======================================================================[.rst:
ECMDeprecationSettings
-----------------------
This module provides the ``ecm_set_disabled_deprecation_versions`` function setting the excluding
deprecated API for Qt and KF projects.
This method expects pairs of the identifier and deprecation version.
For the identifier ``QT`` this functions adds the definition ``QT_DISABLE_DEPRECATED_BEFORE`` with the given version in a hexadecimal format.
Otherwise the name for the definition is generated using ``${IDENTIFIER}_DISABLE_DEPRECATED_BEFORE_AND_AT``,
following the naming of the generated code in :module:`ECMGenerateExportHeader`.
The version for the definition can be overwritten, by passing definition name and the deprecation version
as a CMake definition. This allows one to exclude deprecations without having to edit the CMakeLists.txt file.
This module provides the following function:
::
ecm_set_disabled_deprecation_versions(
[DISABLE_NEWER_WARNINGS] # since 5.96
[<identifier> <deprecation_version>]
[<identifier2> <deprecation_version2>]
)
``DISABLE_NEWER_WARNINGS`` disables additionally the compiler warnings for API deprecated in newer versions
of the same major version.
Example usage:
.. code-block:: cmake
set(QT_MIN_VERSION "5.15.2")
set(KF5_MIN_VERSION "5.90")
ecm_set_disabled_deprecation_versions(
QT ${QT_MIN_VERSION}
KF ${KF5_MIN_VERSION}
KCOREADDONS 5.89.0 # In case we depend on deprecated KCoreAddons API
)
Since 5.91
#]=======================================================================]
function (ecm_set_disabled_deprecation_versions)
include(CMakeParseArguments)
cmake_parse_arguments(ARGS "SHOW_DEPRECATIONS;DISABLE_NEWER_WARNINGS" "" "" ${ARGN})
# support legacy initial flag to opt-in to warnings
if (ARGS_SHOW_DEPRECATIONS)
message(DEPRECATION "SHOW_DEPRECATIONS is deprecated, since 5.96 warnings are enabled by default.")
endif()
if (ARGS_SHOW_DEPRECATIONS AND ARGS_DISABLE_NEWER_WARNINGS)
message(FATAL_ERROR "SHOW_DEPRECATIONS && DISABLE_NEWER_WARNINGS cannot be set both.")
endif()
set(show_newer_warnings TRUE)
if (ARGS_DISABLE_NEWER_WARNINGS)
set(show_newer_warnings FALSE)
endif()
list(LENGTH ARGS_UNPARSED_ARGUMENTS PAIR_COUNT)
math(EXPR is_even_number "${PAIR_COUNT} % 2")
if (NOT is_even_number EQUAL 0)
message(FATAL_ERROR "Expected number of arguments is an even number of identifiers and version")
endif()
math(EXPR number_pairs "(${PAIR_COUNT} / 2) - 1")
foreach (it RANGE ${number_pairs})
# get values
math(EXPR current_index "${it} * 2")
list(GET ARGS_UNPARSED_ARGUMENTS ${current_index} DEPRECATION_NAME)
math(EXPR next_index "(${it} *2) + 1")
list(GET ARGS_UNPARSED_ARGUMENTS ${next_index} DEPRECATION_VERSION)
# get the string identifier for the target definition
string(COMPARE EQUAL ${DEPRECATION_NAME} "QT" IS_QT_DEPRECATION)
if (IS_QT_DEPRECATION)
set(DEPRECATION_DEFINITION_NAME QT_DISABLE_DEPRECATED_BEFORE)
else()
set(DEPRECATION_DEFINITION_NAME ${DEPRECATION_NAME}_DISABLE_DEPRECATED_BEFORE_AND_AT)
endif()
# we want to be able to set this version without being forced to edit the CMakeLists.txt file
if (${${DEPRECATION_DEFINITION_NAME}})
set(DEPRECATION_VERSION "${${DEPRECATION_DEFINITION_NAME}}")
endif()
# make a sanity check to make sure we do not get malformed versions
_ecm_version_triple_sanity_check("${DEPRECATION_VERSION}")
# add the actual compile definition with the given hex value
_ecm_geh_generate_hex_number_from_version(DEPRECATION_HEX_VERSION ${DEPRECATION_VERSION})
add_definitions(-D${DEPRECATION_DEFINITION_NAME}=${DEPRECATION_HEX_VERSION})
# Set the version for the deprecation warnings
if (show_newer_warnings)
string(REGEX MATCH "([0-9]+)\\." _ ${DEPRECATION_VERSION})
if (NOT CMAKE_MATCH_1)
message(FATAL_ERROR "Failed to get major version from ${DEPRECATION_VERSION}")
endif()
# Add 1 to the major version and store it as a hex value
math(EXPR next_major_version "(${CMAKE_MATCH_1} + 1) * 65536 " OUTPUT_FORMAT HEXADECIMAL)
add_definitions(-D${DEPRECATION_NAME}_DEPRECATED_WARNINGS_SINCE=${next_major_version})
endif()
endforeach()
endfunction()
# helper method
function(_ecm_geh_generate_hex_number_from_version _var_name _version)
set(_hexnumber 0)
string(REGEX MATCH "^([0-9]+)\\.([0-9]+)(\\.([0-9]+))?$" _ ${_version})
# Set the patch version to 0, if none is specified by the regex.
# This is the case for min. versions that don't specify the patch level, like in the snipped of the method docs.
if (NOT CMAKE_MATCH_4)
set(CMAKE_MATCH_4 "0")
endif()
math(EXPR _hexnumber "${CMAKE_MATCH_1}*65536 + ${CMAKE_MATCH_2}*256 + ${CMAKE_MATCH_4}" OUTPUT_FORMAT HEXADECIMAL)
set(${_var_name} ${_hexnumber} PARENT_SCOPE)
endfunction()
function (_ecm_version_triple_sanity_check unchecked_version)
# helper string
set(_version_triple_regexp "^([0-9]+)\\.([0-9]+)(\\.([0-9]+))?$")
# args sanity check
if (NOT unchecked_version)
message(FATAL_ERROR "No VERSION passed when calling ecm_set_deprecation_versions().")
elseif(NOT unchecked_version MATCHES ${_version_triple_regexp})
message(FATAL_ERROR "VERSION ${unchecked_version} expected to be in x.y.z format when calling ecm_set_deprecation_versions().")
endif()
endfunction()
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