[Interest] How prevent "Code will never be executed" when compiling "qDebug() << enumvar" ?

Edward Sutton edward.sutton at subsite.com
Tue Dec 15 14:45:57 CET 2015 

This hides the unreachable code warning from the compiler.  Although almost as ugly as hiding it by wrapping inside "#ifdef QT_DEBUG”


        QString enumValue;

        QDebug(&enumValue) << this->d_ptr->trackerFileSend.state();

        qDebug("%s", enumValue.toLatin1().data());

-Ed


On Dec 15, 2015, at 7:31 AM, Edward Sutton <edward.sutton at subsite.com<mailto:edward.sutton at subsite.com>> wrote:


On Dec 15, 2015, at 3:31 AM, Thiago Macieira <thiago.macieira at intel.com<mailto:thiago.macieira at intel.com>> wrote:

On Monday 14 December 2015 21:44:47 Edward Sutton wrote:
#ifdef QT_DEBUG // Fix iOS Clang warning "Code will never be executed"

qDebug() << "TapAndHoldGesture: " << tapAndHold->state();

#endif

>We have not seen this warning. What version of Xcode is this warning showing
up on?

Xcode 7.2.

In an attempt to reduce Xcode's nagging to accept it’s *many* recommended project settings, I have the following warning flags added to my qmake project.  There are still another half-dozen recommended project settings that I have not figured out what the associated flags are.

The issue only shows up in release build.  The following warnings are added to my qmake project for all builds.


    # Silence warnings on OSX ( I do not get these on the OSX build VM? Same XCode 6.4? )

    # qobject.h:108: warning: unknown warning group '-Winconsistent-missing-override', ignored [-Wunknown-pragmas]

    QMAKE_CXXFLAGS_WARN_ON += -Wno-unknown-pragmas


    Q_CLANG_WARN_BOOL_CONVERSION.name = CLANG_WARN_BOOL_CONVERSION

    Q_CLANG_WARN_BOOL_CONVERSION.value = YES

    QMAKE_MAC_XCODE_SETTINGS += Q_CLANG_WARN_BOOL_CONVERSION


    Q_CLANG_WARN_CONSTANT_CONVERSION.name = CLANG_WARN_CONSTANT_CONVERSION

    Q_CLANG_WARN_CONSTANT_CONVERSION.value = YES

    QMAKE_MAC_XCODE_SETTINGS += Q_CLANG_WARN_CONSTANT_CONVERSION


    Q_CLANG_WARN_EMPTY_BODY.name = CLANG_WARN_EMPTY_BODY

    Q_CLANG_WARN_EMPTY_BODY.value = YES

    QMAKE_MAC_XCODE_SETTINGS += Q_CLANG_WARN_EMPTY_BODY


    Q_CLANG_WARN_ENUM_CONVERSION.name = CLANG_WARN_ENUM_CONVERSION

    Q_CLANG_WARN_ENUM_CONVERSION.value = YES

    QMAKE_MAC_XCODE_SETTINGS += Q_CLANG_WARN_ENUM_CONVERSION


    Q_CLANG_WARN_INT_CONVERSION.name = CLANG_WARN_INT_CONVERSION

    Q_CLANG_WARN_INT_CONVERSION.value = YES

    QMAKE_MAC_XCODE_SETTINGS += Q_CLANG_WARN_INT_CONVERSION


    Q_CLANG_WARN_UNREACHABLE_CODE.name = CLANG_WARN_UNREACHABLE_CODE

    Q_CLANG_WARN_UNREACHABLE_CODE.value = YES

    QMAKE_MAC_XCODE_SETTINGS += Q_CLANG_WARN_UNREACHABLE_CODE


    Q_CLANG_WARN__DUPLICATE_METHOD_MATCH.name = CLANG_WARN__DUPLICATE_METHOD_MATCH

    Q_CLANG_WARN__DUPLICATE_METHOD_MATCH.value = YES

    QMAKE_MAC_XCODE_SETTINGS += Q_CLANG_WARN__DUPLICATE_METHOD_MATCH


    Q_ENABLE_STRICT_OBJC_MSGSEND.name = ENABLE_STRICT_OBJC_MSGSEND

    Q_ENABLE_STRICT_OBJC_MSGSEND.value = YES

    QMAKE_MAC_XCODE_SETTINGS += Q_ENABLE_STRICT_OBJC_MSGSEND


    Q_GCC_NO_COMMON_BLOCKS.name = GCC_NO_COMMON_BLOCKS

    Q_GCC_NO_COMMON_BLOCKS.value = YES

    QMAKE_MAC_XCODE_SETTINGS += Q_GCC_NO_COMMON_BLOCKS


    Q_GCC_WARN_64_TO_32_BIT_CONVERSION.name = GCC_WARN_64_TO_32_BIT_CONVERSION

    Q_GCC_WARN_64_TO_32_BIT_CONVERSION.value = YES

    QMAKE_MAC_XCODE_SETTINGS += Q_GCC_WARN_64_TO_32_BIT_CONVERSION


    Q_GCC_WARN_ABOUT_RETURN_TYPE.name = GCC_WARN_ABOUT_RETURN_TYPE

    Q_GCC_WARN_ABOUT_RETURN_TYPE.value = YES

    QMAKE_MAC_XCODE_SETTINGS += Q_GCC_WARN_ABOUT_RETURN_TYPE


    Q_GCC_WARN_UNDECLARED_SELECTOR.name = GCC_WARN_UNDECLARED_SELECTOR

    Q_GCC_WARN_UNDECLARED_SELECTOR.value = YES

    QMAKE_MAC_XCODE_SETTINGS += Q_GCC_WARN_UNDECLARED_SELECTOR


    Q_GCC_WARN_UNINITIALIZED_AUTOS.name = GCC_WARN_UNINITIALIZED_AUTOS

    Q_GCC_WARN_UNINITIALIZED_AUTOS.value = YES

    QMAKE_MAC_XCODE_SETTINGS += Q_GCC_WARN_UNINITIALIZED_AUTOS


    Q_GCC_WARN_UNUSED_FUNCTION.name = GCC_WARN_UNUSED_FUNCTION

    Q_GCC_WARN_UNUSED_FUNCTION.value = YES

    QMAKE_MAC_XCODE_SETTINGS += Q_GCC_WARN_UNUSED_FUNCTION


    Q_GCC_WARN_UNUSED_VARIABLE.name = GCC_WARN_UNUSED_VARIABLE

    Q_GCC_WARN_UNUSED_VARIABLE.value = YES

    QMAKE_MAC_XCODE_SETTINGS += Q_GCC_WARN_UNUSED_VARIABLE


Example:

Users/edward3/Documents/projects/build-tsr-iphoneos_clang_Qt_5_5_1_for_iOS_1-Release/obj/TSR.build/Release-iphoneos/TSR.build/Objects-normal/armv7/trackerconnection.o
/Users/edward3/Documents/projects/tsr-mobile-fileput/source/trackerconnection.cpp:219:18: error: code will never be executed [-Werror,-Wunreachable-code]

qDebug() << this->d_ptr->trackerFileSend.state();
^~
/Users/edward3/Documents/projects/tsr-mobile-fileput/source/trackerconnection.cpp:209:52: error: code will never be executed [-Werror,-Wunreachable-code]

qDebug() << "TrackerConnection::TrackerState:" << d_ptr->trackerState;
^~
2 errors generated.


-Ed




--
Thiago Macieira - thiago.macieira (AT) intel.com<http://intel.com/>
 Software Architect - Intel Open Source Technology Center

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