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# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: BSD-3-Clause
# Enable compiler warnings by default. All compilers except MSVC support -Wall -Wextra
#
# You can disable the warnings for specific targets (for instance containing 3rd party code)
# by calling qt_disable_warnings(target). This will set the QT_COMPILE_OPTIONS_DISABLE_WARNINGS
# property checked below, and is equivalent to qmake's CONFIG += warn_off.
set(_qt_compiler_warning_flags_on "")
set(_qt_compiler_warning_flags_off -w)
if (MSVC)
list(APPEND _qt_compiler_warning_flags_on /W3)
# MSVC warns about macros expanding to `defined` when using the
# new preprocessor (so far, default for C11 code, but not C++).
# Suppress the warning, see also the comment below for GCC.
list(APPEND _qt_compiler_warning_flags_on /wd5105)
else()
if(CMAKE_CXX_COMPILER_ID STREQUAL "GHS") # There is no -Wextra flag for GHS compiler.
list(APPEND _qt_compiler_warning_flags_on -Wall)
else()
list(APPEND _qt_compiler_warning_flags_on -Wall -Wextra)
endif()
if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS "17.0.0")
# GCC warns if a macro is expanded to `defined`, but doesn't
# differentiate between object-like and function-like macros.
# The latter generally work everywhere. We don't have fine-grained
# control, so disable the warning (tst_qglobal tests for this
# behavior.)
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118542
list(APPEND _qt_compiler_warning_flags_on -Wno-expansion-to-defined)
endif()
endif()
endif()
set(_qt_compiler_warning_flags_condition
"$<BOOL:$<TARGET_PROPERTY:QT_COMPILE_OPTIONS_DISABLE_WARNINGS>>")
set(_qt_compiler_warning_flags_genex
"$<IF:${_qt_compiler_warning_flags_condition},${_qt_compiler_warning_flags_off},${_qt_compiler_warning_flags_on}>")
set(_qt_compiler_warning_flags_language_condition
"$<COMPILE_LANGUAGE:CXX,C,OBJC,OBJCXX>")
set(_qt_compiler_warning_flags_language_conditional_genex
"$<${_qt_compiler_warning_flags_language_condition}:${_qt_compiler_warning_flags_genex}>")
# Need to replace semicolons so that the list is not wrongly expanded in the add_compile_options
# call.
string(REPLACE ";" "$<SEMICOLON>"
_qt_compiler_warning_flags_language_conditional_genex
"${_qt_compiler_warning_flags_language_conditional_genex}")
add_compile_options(${_qt_compiler_warning_flags_language_conditional_genex})
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