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CMake: Allow evaluating features before a module is processed

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Introduce an internal qt_feature_evaluate_features() function
which takes a list of configure.cmake paths, and evaluates the
features declared in those files, thus setting a bunch of cache
variables.

This is required to implement the equivalent of what qtbase/src.pro
does, which includes the feature .pri files to decide whether
bundled 3rd party libraries need to be built.

Change-Id: I5552f488671c001eb3f204245b905ab981017a9f
Reviewed-by: Leander Beernaert <leander.beernaert@qt.io>
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
This commit is contained in:
Alexandru Croitor 2020-02-24 15:06:30 +01:00
parent 331b153be5
commit 173079819d
1 changed files with 36 additions and 17 deletions
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53
cmake/QtFeature.cmake
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@ -1,15 +1,19 @@
function(qt_feature_module_begin) function(qt_feature_module_begin)
qt_parse_all_arguments(arg "qt_feature_module_begin" qt_parse_all_arguments(arg "qt_feature_module_begin"
"NO_MODULE" "LIBRARY;PRIVATE_FILE;PUBLIC_FILE" "PUBLIC_DEPENDENCIES;PRIVATE_DEPENDENCIES" ${ARGN}) "NO_MODULE;ONLY_EVALUATE_FEATURES"
"LIBRARY;PRIVATE_FILE;PUBLIC_FILE" "PUBLIC_DEPENDENCIES;PRIVATE_DEPENDENCIES" ${ARGN})
if ("${arg_LIBRARY}" STREQUAL "" AND (NOT ${arg_NO_MODULE})) if(NOT arg_ONLY_EVALUATE_FEATURES)
message(FATAL_ERROR "qt_feature_begin_module needs a LIBRARY name! (or specify NO_MODULE)") if ("${arg_LIBRARY}" STREQUAL "" AND (NOT ${arg_NO_MODULE}))
endif() message(FATAL_ERROR
if ("${arg_PUBLIC_FILE}" STREQUAL "") "qt_feature_begin_module needs a LIBRARY name! (or specify NO_MODULE)")
message(FATAL_ERROR "qt_feature_begin_module needs a PUBLIC_FILE name!") endif()
endif() if ("${arg_PUBLIC_FILE}" STREQUAL "")
if ("${arg_PRIVATE_FILE}" STREQUAL "") message(FATAL_ERROR "qt_feature_begin_module needs a PUBLIC_FILE name!")
message(FATAL_ERROR "qt_feature_begin_module needs a PRIVATE_FILE name!") endif()
if ("${arg_PRIVATE_FILE}" STREQUAL "")
message(FATAL_ERROR "qt_feature_begin_module needs a PRIVATE_FILE name!")
endif()
endif() endif()
set(__QtFeature_library "${arg_LIBRARY}" PARENT_SCOPE) set(__QtFeature_library "${arg_LIBRARY}" PARENT_SCOPE)
@ -412,8 +416,21 @@ function(qt_internal_feature_write_file file features extra)
file(GENERATE OUTPUT "${file}" CONTENT "${contents}") file(GENERATE OUTPUT "${file}" CONTENT "${contents}")
endfunction() endfunction()
# Helper function which evaluates features from a given list of configure.cmake paths
# and creates the feature cache entries.
# Should not be used directly, unless features need to be available in a directory scope before the
# associated module evaluates the features.
# E.g. qtbase/src.pro needs access to Core features before src/corelib/CMakeLists.txt is parsed.
function(qt_feature_evaluate_features list_of_paths)
qt_feature_module_begin(ONLY_EVALUATE_FEATURES)
foreach(path ${list_of_paths})
include("${path}")
endforeach()
qt_feature_module_end(ONLY_EVALUATE_FEATURES)
endfunction()
function(qt_feature_module_end) function(qt_feature_module_end)
set(flags) set(flags ONLY_EVALUATE_FEATURES)
set(options OUT_VAR_PREFIX) set(options OUT_VAR_PREFIX)
set(multiopts) set(multiopts)
cmake_parse_arguments(arg "${flags}" "${options}" "${multiopts}" ${ARGN}) cmake_parse_arguments(arg "${flags}" "${options}" "${multiopts}" ${ARGN})
@ -475,13 +492,15 @@ function(qt_feature_module_end)
unset(_QT_FEATURE_DEFINITION_${feature} PARENT_SCOPE) unset(_QT_FEATURE_DEFINITION_${feature} PARENT_SCOPE)
endforeach() endforeach()
qt_internal_feature_write_file("${CMAKE_CURRENT_BINARY_DIR}/${__QtFeature_private_file}" if(NOT arg_ONLY_EVALUATE_FEATURES)
"${__QtFeature_private_features}" "${__QtFeature_private_extra}" qt_internal_feature_write_file("${CMAKE_CURRENT_BINARY_DIR}/${__QtFeature_private_file}"
) "${__QtFeature_private_features}" "${__QtFeature_private_extra}"
)
qt_internal_feature_write_file("${CMAKE_CURRENT_BINARY_DIR}/${__QtFeature_public_file}" qt_internal_feature_write_file("${CMAKE_CURRENT_BINARY_DIR}/${__QtFeature_public_file}"
"${__QtFeature_public_features}" "${__QtFeature_public_extra}" "${__QtFeature_public_features}" "${__QtFeature_public_extra}"
) )
endif()
# Extra header injections which have to have forwarding headers created by # Extra header injections which have to have forwarding headers created by
# qt_install_injections. # qt_install_injections.
@ -499,7 +518,7 @@ function(qt_feature_module_end)
set(${arg_OUT_VAR_PREFIX}extra_library_injections ${injections} PARENT_SCOPE) set(${arg_OUT_VAR_PREFIX}extra_library_injections ${injections} PARENT_SCOPE)
endif() endif()
if (NOT ("${target}" STREQUAL "NO_MODULE")) if (NOT ("${target}" STREQUAL "NO_MODULE") AND NOT arg_ONLY_EVALUATE_FEATURES)
get_target_property(targetType "${target}" TYPE) get_target_property(targetType "${target}" TYPE)
if("${targetType}" STREQUAL "INTERFACE_LIBRARY") if("${targetType}" STREQUAL "INTERFACE_LIBRARY")
set(propertyPrefix "INTERFACE_") set(propertyPrefix "INTERFACE_")