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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 ${entry_path})
endforeach()
# Make sure that the header compiles with our strict options
set(hcleanDEFS -DQT_NO_CAST_TO_ASCII
-DQT_NO_CAST_FROM_ASCII
-DQT_NO_URL_CAST_FROM_STRING
-DQT_NO_CAST_FROM_BYTEARRAY
-DQT_NO_KEYWORDS
-DQT_USE_QSTRINGBUILDER
-DQT_USE_FAST_OPERATOR_PLUS)
if ("${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)
foreach(header ${hclean_headers})
get_filename_component(input_path "${header}" ABSOLUTE)
set(artifact_path "header_${header}.o")
add_custom_command(
OUTPUT "${artifact_path}"
COMMENT "headersclean: Checking header ${header}"
COMMAND "${CMAKE_CXX_COMPILER}" -c ${CMAKE_CXX_FLAGS} ${hcleanFLAGS}
-I "${QT_BUILD_DIR}/include" ${hcleanDEFS} -xc++ "${input_path}"
-o${artifact_path}
IMPLICIT_DEPENDS CXX
VERBATIM)
list(APPEND hclean_artifacts "${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_${header}.o")
add_custom_command(
OUTPUT "${artifact_path}"
COMMENT "headersclean: Checking header ${header}"
COMMAND "${CMAKE_CXX_COMPILER}" -nologo -c ${CMAKE_CXX_FLAGS} ${hcleanFLAGS}
-I "${QT_BUILD_DIR}/include" ${hcleanDEFS} -FI "${input_path}"
-Fo${artifact_path} "${source_path}"
IMPLICIT_DEPENDS CXX
VERBATIM)
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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