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qt5base-lts/cmake/QtHeadersClean.cmake
Kai Köhne 1702393644 Run headers_clean check with C++20 (gcc, clang) 
The headers are already somewhat tested with C++17 in the regular
build. So let's try in the headers_clean check with C++20 instead.

Using C++20 with MSVC 19.28 doesn't work yet though:

  corelib/tools/qalgorithms.h(247): error C2039: 'popcount': is not a member of 'std'
  corelib/tools/qhashfunctions.h(311): note: see declaration of 'std'
  corelib/tools/qalgorithms.h(247): error C3861: 'popcount': identifier not found
  ...

Task-number: QTQAINFRA-4242
Change-Id: I1b48bcb9656fe1587fe03d3a17e3484c693aa295
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
2021-02-15 13:16:54 +00:00

233 lines
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CMake
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# Add a custom ${module_include_name}_header_check target that builds each header in
# ${module_headers} with a custom set of defines. This makes sure our public headers
# are self-contained, and also compile with more strict compiler options.
function(qt_internal_add_headers_clean_target
module_target
module_include_name
module_headers)
# module_headers is a list of strings of the form
# <headerfile>[:feature]
set(hclean_headers "")
foreach(entry ${module_headers})
string(REPLACE ":" ";" entry_list ${entry})
list(LENGTH entry_list entry_list_length)
list(GET entry_list 0 entry_path)
if (${entry_list_length} EQUAL 2)
list(GET entry_list 1 entry_feature)
if (NOT QT_FEATURE_${entry_feature})
message(STATUS "headersclean: Ignoring header ${entry_path} because of missing feature ${entry_feature}")
continue()
endif()
endif()
list(APPEND hclean_headers ${entry_path})
endforeach()
# Make sure that the header compiles with our strict options
set(hcleanDEFS -DQT_NO_CAST_TO_ASCII
-DQT_NO_CAST_FROM_ASCII
-DQT_NO_URL_CAST_FROM_STRING
-DQT_NO_CAST_FROM_BYTEARRAY
-DQT_NO_KEYWORDS
-DQT_USE_QSTRINGBUILDER
-DQT_USE_FAST_OPERATOR_PLUS)
set(compiler_to_run "${CMAKE_CXX_COMPILER}")
if(CMAKE_CXX_COMPILER_LAUNCHER)
list(PREPEND compiler_to_run "${CMAKE_CXX_COMPILER_LAUNCHER}")
endif()
set(prop_prefix "")
get_target_property(target_type "${target}" TYPE)
if(target_type STREQUAL "INTERFACE_LIBRARY")
set(prop_prefix "INTERFACE_")
endif()
set(target_includes_genex
"$<TARGET_PROPERTY:${module_target},${prop_prefix}INCLUDE_DIRECTORIES>")
set(includes_exist_genex "$<BOOL:${target_includes_genex}>")
set(target_includes_joined_genex
"$<${includes_exist_genex}:-I$<JOIN:${target_includes_genex},;-I>>")
# qmake doesn't seem to add the defines that are set by the header_only_module when checking the
# the cleanliness of the module's header files.
# This allows us to bypass an error with CMake 3.18 and lower when trying to evaluate
# genex-enhanced compile definitions. An example of that is in
# qttools/src/designer/src/uiplugin/CMakeLists.txt which ends up causing the following error
# message:
# CMake Error at qtbase/cmake/QtModuleHelpers.cmake:35 (add_library):
# INTERFACE_LIBRARY targets may only have whitelisted properties. The
# property "QT_PLUGIN_CLASS_NAME" is not allowed.
# Call Stack (most recent call first):
# src/designer/src/uiplugin/CMakeLists.txt:7 (qt_internal_add_module)
if(NOT target_type STREQUAL "INTERFACE_LIBRARY")
set(target_defines_genex
"$<TARGET_PROPERTY:${module_target},${prop_prefix}COMPILE_DEFINITIONS>")
set(defines_exist_genex "$<BOOL:${target_defines_genex}>")
set(target_defines_joined_genex
"$<${defines_exist_genex}:-D$<JOIN:${target_defines_genex},;-D>>")
endif()
# TODO: FIXME
# Passing COMPILE_OPTIONS can break add_custom_command() if the values contain genexes
# that add_custom_command does not support.
#
# Such a case happens on Linux where libraries linking against Threads::Threads bring in a
# '<$<COMPILE_LANG_AND_ID:CUDA,NVIDIA>' genex.
#
# If this is really required for headersclean (and qmake's headerclean implementation does
# actually pass all flags of the associated target), we'll have to replace the genex usage
# with an implementation that recursively processes a target's dependencies property
# to compile an expanded list of values for COMPILE_OPTIONS, and then filter out any genexes.
#
# This is similar to the proposed workaround at
# https://gitlab.kitware.com/cmake/cmake/-/issues/21074#note_814979
#
# See also https://gitlab.kitware.com/cmake/cmake/-/issues/21336
#
#set(target_compile_options_genex "$<TARGET_PROPERTY:${module_target},COMPILE_OPTIONS>")
#set(compile_options_exist_genex "$<BOOL:${target_compile_options_genex}>")
#set(target_compile_options_joined_genex
# "$<${compile_options_exist_genex}:$<JOIN:${target_compile_options_genex},;>>")
set(target_compile_flags_genex
"$<TARGET_PROPERTY:${module_target},${prop_prefix}COMPILE_FLAGS>")
set(compile_flags_exist_genex "$<BOOL:${target_compile_flags_genex}>")
set(target_compile_flags_joined_genex
"$<${compile_flags_exist_genex}:$<JOIN:${target_compile_flags_genex},;>>")
if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU"
OR "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang"
OR "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Intel")
# Turn on some extra warnings not found in -Wall -Wextra.
set(hcleanFLAGS -Wall -Wextra -Werror -Woverloaded-virtual -Wshadow -Wundef -Wfloat-equal
-Wnon-virtual-dtor -Wpointer-arith -Wformat-security -Wno-long-long -Wno-variadic-macros
-pedantic-errors)
if(QT_FEATURE_reduce_relocations AND UNIX)
list(APPEND hcleanFLAGS -fPIC)
endif()
if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Intel")
# these warnings are disabled because explicit constructors with zero or
# multiple arguments are permitted in C++11:
# 2304: non-explicit constructor with single argument may cause implicit type
# conversion
# 2305: declaration of 'explicit' constructor without a single argument is
# redundant
#
# ICC 14+ has a bug with -Wshadow, emitting it for cases where there's no
# shadowing (issue ID 0000698329, task DPD200245740)
list(APPEND hcleanFLAGS -wd2304,2305 -Wshadow)
else()
# options accepted by GCC and Clang
list(APPEND hcleanFLAGS -Wchar-subscripts -Wold-style-cast)
if (NOT ((TEST_architecture_arch STREQUAL arm)
OR (TEST_architecture_arch STREQUAL mips)))
list(APPEND hcleanFLAGS -Wcast-align)
endif()
if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
list(APPEND hcleanFLAGS -Wzero-as-null-pointer-constant)
if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 4.5)
list(APPEND hcleanFLAGS -Wdouble-promotion)
endif()
if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 4.9)
list(APPEND hcleanFLAGS -Wfloat-conversion)
# GCC 9 has a lot of false positives relating to these
list(APPEND hcleanFlags -Wno-deprecated-copy -Wno-redundant-move
-Wno-format-overflow -Wno-init-list-lifetime)
endif()
endif()
endif()
# Use strict mode C++20, with no GNU extensions (see -pedantic-errors above).
list(APPEND hcleanFLAGS -std=c++2a)
set(cxx_flags ${CMAKE_CXX_FLAGS})
if(APPLE AND CMAKE_OSX_SYSROOT)
list(APPEND cxx_flags "${CMAKE_CXX_SYSROOT_FLAG}" "${CMAKE_OSX_SYSROOT}")
endif()
if(APPLE AND QT_FEATURE_framework)
# For some reason CMake doesn't generate -iframework flags from the INCLUDE_DIRECTORIES
# generator expression we provide, so pass it explicitly and hope for the best.
list(APPEND framework_includes
"-iframework" "${QT_BUILD_INTERNALS_RELOCATABLE_INSTALL_PREFIX}/${INSTALL_LIBDIR}")
endif()
foreach(header ${hclean_headers})
get_filename_component(input_path "${header}" ABSOLUTE)
set(artifact_path "header_check/${header}.o")
get_filename_component(artifact_directory "${artifact_path}" DIRECTORY)
set(comment_header_path "${CMAKE_CURRENT_SOURCE_DIR}/${header}")
file(RELATIVE_PATH comment_header_path "${PROJECT_SOURCE_DIR}" "${comment_header_path}")
add_custom_command(
OUTPUT "${artifact_path}"
COMMENT "headersclean: Checking header ${comment_header_path}"
COMMAND ${CMAKE_COMMAND} -E make_directory "${artifact_directory}"
COMMAND
${compiler_to_run} -c ${cxx_flags}
"${target_compile_flags_joined_genex}"
"${target_defines_joined_genex}"
${hcleanFLAGS}
"${target_includes_joined_genex}"
${framework_includes}
${hcleanDEFS}
-xc++ "${input_path}"
-o${artifact_path}
IMPLICIT_DEPENDS CXX
VERBATIM
COMMAND_EXPAND_LISTS)
list(APPEND hclean_artifacts "${artifact_path}")
endforeach()
elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
# -Za would enable strict standards behavior, but we can't add it because
# <windows.h> and <GL.h> violate the standards.
set(hcleanFLAGS -std:c++17 -WX -W3)
# cl.exe needs a source path
get_filename_component(source_path "${QT_MKSPECS_DIR}/features/data/dummy.cpp" REALPATH)
foreach(header ${hclean_headers})
# We need realpath here to make sure path starts with drive letter
get_filename_component(input_path "${header}" REALPATH)
set(artifact_path "header_${header}.o")
set(comment_header_path "${CMAKE_CURRENT_SOURCE_DIR}/${header}")
file(RELATIVE_PATH comment_header_path "${PROJECT_SOURCE_DIR}" "${comment_header_path}")
add_custom_command(
OUTPUT "${artifact_path}"
COMMENT "headersclean: Checking header ${comment_header_path}"
COMMAND
${compiler_to_run} -nologo -c ${CMAKE_CXX_FLAGS}
"${target_compile_flags_joined_genex}"
"${target_defines_joined_genex}"
${hcleanFLAGS}
"${target_includes_joined_genex}"
${hcleanDEFS}
-FI "${input_path}"
-Fo${artifact_path} "${source_path}"
IMPLICIT_DEPENDS CXX
VERBATIM
COMMAND_EXPAND_LISTS)
list(APPEND hclean_artifacts "${artifact_path}")
endforeach()
else()
message(ERROR "CMAKE_CXX_COMPILER_ID \"${CMAKE_CXX_COMPILER_ID}\" is not supported for the headersclean check.")
endif()
add_custom_target(${module_include_name}_header_check
COMMENT "headersclean: Checking headers in ${module_include_name}"
DEPENDS ${hclean_artifacts}
VERBATIM)
add_dependencies(${module_target} ${module_include_name}_header_check)
endfunction()
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