qt5base-lts/mkspecs/features/qt_common.prf

#
#  W A R N I N G
#  -------------
#
# This file is not part of the Qt API.  It exists purely as an
# implementation detail.  It may change from version to version
# without notice, or even be removed.
#
# We mean it.
#

QMAKE_DIR_REPLACE_SANE += DESTDIR
CONFIG -= debug_and_release_target

DEFINES *= QT_NO_NARROWING_CONVERSIONS_IN_CONNECT

qtConfig(c++11): CONFIG += c++11 strict_c++
qtConfig(c++14): CONFIG += c++14
qtConfig(c++1z): CONFIG += c++1z
qtConfig(c99): CONFIG += c99
qtConfig(c11): CONFIG += c11
qtConfig(stack-protector-strong): CONFIG += stack_protector_strong
contains(TEMPLATE, .*lib) {
    # module and plugins
    if(!host_build|!cross_compile):qtConfig(reduce_exports): CONFIG += hide_symbols
    unix:qtConfig(reduce_relocations): CONFIG += bsymbolic_functions
    qtConfig(separate_debug_info): CONFIG += separate_debug_info

    !isEmpty(_QMAKE_SUPER_CACHE_): \
        rplbase = $$dirname(_QMAKE_SUPER_CACHE_)/[^/][^/]*
    else: \
        rplbase = $$MODULE_BASE_OUTDIR
    host_build {
        qqt_libdir = \$\$\$\$[QT_HOST_LIBS]
        qt_libdir = $$[QT_HOST_LIBS]
    } else {
        qqt_libdir = \$\$\$\$[QT_INSTALL_LIBS]
        qt_libdir = $$[QT_INSTALL_LIBS]
    }
    contains(QMAKE_DEFAULT_LIBDIRS, $$qt_libdir) {
        lib_replace.match = "[^ ']*$$rplbase/lib"
        lib_replace.replace =
    } else {
        lib_replace.match = $$rplbase/lib
        lib_replace.replace = $$qqt_libdir
    }
    lib_replace.CONFIG = path
    QMAKE_PRL_INSTALL_REPLACE += lib_replace
}

# The remainder of this file must not apply to host tools/libraries,
# as the host compiler's version and capabilities are not checked.
host_build:cross_compile: return()

# Extra warnings for Qt non-example code, to ensure cleanliness of the sources.
# The block below may turn these warnings into errors for some Qt targets.
# -Wdate-time: warn if we use __DATE__ or __TIME__ (we want to be able to reproduce the exact same binary)
# -Wvla: use of variable-length arrays (an extension to C++)
clang {
    clang_ver = $${QT_CLANG_MAJOR_VERSION}.$${QT_CLANG_MINOR_VERSION}
    apple_ver = $${QT_APPLE_CLANG_MAJOR_VERSION}.$${QT_APPLE_CLANG_MINOR_VERSION}
    versionAtLeast(clang_ver, 3.5): \
        QMAKE_CXXFLAGS_WARN_ON += -Wdate-time

    versionAtLeast(clang_ver, 3.6)|versionAtLeast(apple_ver, 6.3): \
        QMAKE_CXXFLAGS_WARN_ON += -Winconsistent-missing-override

    darwin {
        QMAKE_CXXFLAGS_WARN_ON += \
            -Wobjc-interface-ivars \
            -Wobjc-method-access \
            -Wobjc-multiple-method-names

        # Clang/LLVM 5.0 and Xcode 9.0 introduced unguarded availability warnings.
        # The same construct has been a hard error in Swift from the very beginning.
        versionAtLeast(clang_ver, 5.0)|versionAtLeast(apple_ver, 9.0): \
            QMAKE_CXXFLAGS_WARN_ON += \
                -Werror=unguarded-availability \
                -Werror=unguarded-availability-new \
                -Werror=unsupported-availability-guard
    }
} else: gcc:!intel_icc {
    QMAKE_CXXFLAGS_WARN_ON += -Wvla
    # GCC 5 fixed -Wmissing-field-initializers for when there are no initializers
    lessThan(QT_GCC_MAJOR_VERSION, 5): QMAKE_CXXFLAGS_WARN_ON += -Wno-missing-field-initializers
    # GCC 5 introduced -Wdate-time
    greaterThan(QT_GCC_MAJOR_VERSION, 4): QMAKE_CXXFLAGS_WARN_ON += -Wdate-time
    # GCC 6 introduced these
    greaterThan(QT_GCC_MAJOR_VERSION, 5): QMAKE_CXXFLAGS_WARN_ON += -Wshift-overflow=2 -Wduplicated-cond
    # GCC 7 has a lot of false positives relating to this, so disable completely
    greaterThan(QT_GCC_MAJOR_VERSION, 6): QMAKE_CXXFLAGS_WARN_ON += -Wno-stringop-overflow
}

warnings_are_errors:warning_clean {
    # If the module declares that it has does its clean-up of warnings, enable -Werror.
    # This setting is compiler-dependent anyway because it depends on the version of the
    # compiler.
    clang {
        # Apple clang 4.0-4.2,5.0-5.1,6.0-6.4,7.0-7.3,8.0-8.3,9.0-9.2
        # Regular clang 3.x-6.0
        apple_ver = $${QT_APPLE_CLANG_MAJOR_VERSION}.$${QT_APPLE_CLANG_MINOR_VERSION}
        reg_ver = $${QT_CLANG_MAJOR_VERSION}.$${QT_CLANG_MINOR_VERSION}
        contains(apple_ver, "4\\.[012]|5\\.[01]|6\\.[01234]|7\\.[0123]|8\\.[0123]|9\\.[012]")|contains(reg_ver, "[345]\\.|6\\.0") {
            QMAKE_CXXFLAGS_WARN_ON += -Werror -Wno-error=\\$${LITERAL_HASH}warnings -Wno-error=deprecated-declarations $$WERROR
        }
    } else:intel_icc:linux {
        # Intel CC 13.0 - 17.0, on Linux only
        ver = $${QT_ICC_MAJOR_VERSION}.$${QT_ICC_MINOR_VERSION}
        linux:contains(ver, "(1[3456]\\.|17\\.0)") {
            # 177: function "entity" was declared but never referenced
            #      (too aggressive; ICC reports even for functions created due to template instantiation)
            # 1224: #warning directive
            # 1478: function "entity" (declared at line N) was declared deprecated
            # 1881: argument must be a constant null pointer value
            #      (NULL in C++ is usually a literal 0)
            QMAKE_CXXFLAGS_WARN_ON += -Werror -ww177,1224,1478,1881 $$WERROR
        }
    } else:gcc:!clang:!intel_icc:!rim_qcc {
        # GCC 4.6-4.9, 5.x, ...
        ver = $${QT_GCC_MAJOR_VERSION}.$${QT_GCC_MINOR_VERSION}
        contains(ver, "(4\\.[6789]|[5-9]\\..)") {
            QMAKE_CXXFLAGS_WARN_ON += -Werror -Wno-error=cpp -Wno-error=deprecated-declarations $$WERROR

            # GCC prints this bogus warning, after it has inlined a lot of code
            # error: assuming signed overflow does not occur when assuming that (X + c) < X is always false
            QMAKE_CXXFLAGS_WARN_ON += -Wno-error=strict-overflow

            # GCC 7 includes -Wimplicit-fallthrough in -Wextra, but Qt is not yet free of implicit fallthroughs.
            greaterThan(QT_GCC_MAJOR_VERSION, 6): QMAKE_CXXFLAGS_WARN_ON += -Wno-error=implicit-fallthrough

            # Work-around for bug https://code.google.com/p/android/issues/detail?id=58135
            android: QMAKE_CXXFLAGS_WARN_ON += -Wno-error=literal-suffix
        }
    } else:msvc:!intel_icl {
        # enable for MSVC 2012, MSVC 2013, MSVC 2015
        contains(MSVC_VER, "1[124].0"): QMAKE_CXXFLAGS_WARN_ON += -WX
    }
    unset(ver)
}