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CMake: Allow disabling warnings similar to CONFIG += warn_off

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The QT_COMPILE_OPTIONS_WARNINGS_OFF property can be set on targets
in order to disable adding the default compiler warnings flags.

This is useful when building 3rd party library code.

Change-Id: I9f58ca4543b5ea0d2051b7f94f0042d24c4e3a16
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 12:38:55 +01:00
parent 9147065dc4
commit 05a0a278fc
2 changed files with 29 additions and 2 deletions
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8
cmake/QtBuild.cmake
View File

@ -1423,6 +1423,14 @@ function(qt_skip_warnings_are_errors_when_repo_unclean target)
endif()
endfunction()
function(qt_disable_warnings target)
get_target_property(target_type "${target}" TYPE)
if(target_type STREQUAL "INTERFACE_LIBRARY")
return()
endif()
set_target_properties("${target}" PROPERTIES QT_COMPILE_OPTIONS_DISABLE_WARNINGS ON)
endfunction()
function(qt_get_sanitized_plugin_type plugin_type out_var)
# Used to handle some edge cases such as platforms/darwin
string(REGEX REPLACE "[-/]" "_" plugin_type "${plugin_type}")

23
cmake/QtCompilerFlags.cmake
View File

@ -1,6 +1,25 @@
# Set warnings. All compilers except MSVC support -Wall -Wextra
# Allow opting out by setting a QT_COMPILE_WARNINGS_OFF property on targets. This would be the
# equivalent of qmake's CONFIG += warn_off.
set(_qt_compiler_warning_flags_on "")
set(_qt_compiler_warning_flags_off "")
if (MSVC)
add_compile_options(/W3)
list(APPEND _qt_compiler_warning_flags_on /W3)
list(APPEND _qt_compiler_warning_flags_off -W0)
else()
add_compile_options(-Wall -Wextra)
list(APPEND _qt_compiler_warning_flags_on -Wall -Wextra)
list(APPEND _qt_compiler_warning_flags_off -w)
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}>")
# Need to replace semicolons so that the list is not wrongly expanded in the add_compile_options
# call.
string(REPLACE ";" "$<SEMICOLON>"
_qt_compiler_warning_flags_genex "${_qt_compiler_warning_flags_genex}")
add_compile_options(${_qt_compiler_warning_flags_genex})