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qt5base-lts/cmake/QtHeadersClean.cmake
Alexandru Croitor 5d81a5d4f9 CMake: Fix headersclean to build with proper flags 
It's not sufficient to pass -I{prefix}/include when doing the header
clean check.

We need to propagate all target include directories and compile
definitions, and also the compile flags for good measure.

For macOS frameworks we also need to explicitly pass an -iframework
flag (qmake passses -F instead), to ensure that <QtGui/qfoo.h> style
includes are found when building other repos than qtbase.

Task-number: QTBUG-82615
Change-Id: I76d12340bc01c5c948ff04df9a3df384dcb7e076
Reviewed-by: Cristian Adam <cristian.adam@qt.io>
2020-10-23 01:32:39 +02:00

212 lines
9.5 KiB
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 "${CMAKE_CXX_COMPILER_LAUNCHER}")
endif()
set(target_includes_genex "$<TARGET_PROPERTY:${module_target},INCLUDE_DIRECTORIES>")
set(includes_exist_genex "$<BOOL:${target_includes_genex}>")
set(target_includes_joined_genex
"$<${includes_exist_genex}:-I$<JOIN:${target_includes_genex},;-I>>")
set(target_defines_genex "$<TARGET_PROPERTY:${module_target},COMPILE_DEFINITIONS>")
set(defines_exist_genex "$<BOOL:${target_defines_genex}>")
set(target_defines_joined_genex
"$<${defines_exist_genex}:-D$<JOIN:${target_defines_genex},;-D>>")
# TODO: FIXME
# Passing COMPILE_OPTIONS can break add_custom_command() if the values contain genexes
# that add_custom_command does not support.
#
# Such a case happens on Linux where libraries linking against Threads::Threads bring in a
# '<$<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},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++17, with no GNU extensions (see -pedantic-errors above).
list(APPEND hcleanFLAGS -std=c++17)
set(cxx_flags ${CMAKE_CXX_FLAGS})
if(APPLE AND CMAKE_OSX_SYSROOT)
list(APPEND cxx_flags "${CMAKE_CXX_SYSROOT_FLAG}" "${CMAKE_OSX_SYSROOT}")
endif()
if(APPLE)
# For some reason CMake doesn't generate -iframework flags from the INCLUDE_DIRECTORIES
# generator expression we provide, so pass it explicitly and hope for the best.
get_target_property(is_framework "${target}" FRAMEWORK)
if(is_framework)
list(APPEND framework_includes
"-iframework" "${CMAKE_INSTALL_PREFIX}/${INSTALL_LIBDIR}")
endif()
endif()
foreach(header ${hclean_headers})
get_filename_component(input_path "${header}" ABSOLUTE)
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} -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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