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QtFeature: (Re-)evaluate QT_FEATURES based on cached values

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(Re-)evaluate QT_FEATURE_* based on the corresponding cache values
named FEATURE_*.

Change-Id: I57e76af90221937e45979a6d0c366923983ca7d5
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
This commit is contained in:
Tobias Hunger 2018-10-26 11:49:58 +02:00
parent 86098596ca
commit 3b74e0cc0b
1 changed files with 42 additions and 5 deletions
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47
cmake/QtFeature.cmake
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@ -147,6 +147,44 @@ function(qt_evaluate_config_expression resultVar)
set(${resultVar} ${result} PARENT_SCOPE)
endfunction()
function(qt_feature_set_cache_value resultVar feature emit_if calculated label)
if (DEFINED "FEATURE_${feature}")
# Must set up the cache
if (NOT (emit_if))
message(FATAL_ERROR "Sanity check failed: FEATURE_${feature} that was not emitted was found in the CMakeCache.")
endif()
# Revisit value:
set(cache "${FEATURE_${feature}}")
if ((cache STREQUAL "ON") OR (cache STREQUAL "OFF"))
set(result "${cache}")
else()
message(FATAL_ERROR "Sanity check failed: FEATURE_${feature} has invalid value \"${cache}\"!")
endif()
# Fix-up user-provided values
set("FEATURE_${feature}" "${cache}" CACHE BOOL "${label}")
else()
# Initial setup:
if (emit_if)
set("FEATURE_${feature}" "${calculated}" CACHE BOOL "${label}")
endif()
set(result "${calculated}")
endif()
set("${resultVar}" "${result}" PARENT_SCOPE)
endfunction()
macro(qt_feature_set_value feature cache condition label)
set(result "${cache}")
if (NOT (condition) AND (cache))
message(SEND_ERROR "Feature \"${feature}\": Forcing to \"${cache}\" breaks its condition.")
endif()
set(_QT_FEATURE_VALUE_${feature} "${result}" CACHE INTERNAL "${_arg_LABEL}")
set(QT_FEATURE_${feature} "${result}" PARENT_SCOPE)
endmacro()
function(qt_evaluate_feature _feature)
# If the feature was set explicitly by the user to be on or off, in the cache, then
# there's nothing for us to do.
@ -200,13 +238,12 @@ function(qt_evaluate_feature _feature)
qt_evaluate_config_expression(emit_if ${_arg_EMIT_IF})
endif()
if (${emit_if})
set(FEATURE_${_feature} "UNSET" CACHE STRING "${_arg_LABEL}")
set_property(CACHE FEATURE_${_feature} PROPERTY STRINGS UNSET ON OFF)
if (NOT (condition) AND (calculated))
message(FATAL_ERROR "Sanity check failed: Feature ${_feature} is enabled but condition does not hold true.")
endif()
set(_QT_FEATURE_VALUE_${_feature} "${result}" CACHE INTERNAL "${_arg_LABEL}")
set(QT_FEATURE_${_feature} "${result}" PARENT_SCOPE)
qt_feature_set_cache_value(cache "${_feature}" "${emit_if}" "${result}" "${_arg_LABEL}")
qt_feature_set_value("${_feature}" "${cache}" "${condition}" "${_arg_LABEL}")
endfunction()
function(qt_feature_definition _feature _name)