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.
#

contains(QT_CONFIG, c++11): CONFIG += c++11
contains(TEMPLATE, .*lib) {
    # module and plugins
    contains(QT_CONFIG, reduce_exports): CONFIG += hide_symbols
    unix:contains(QT_CONFIG, reduce_relocations): CONFIG += bsymbolic_functions
    contains(QT_CONFIG, largefile): CONFIG += largefile
    contains(QT_CONFIG, separate_debug_info): CONFIG += separate_debug_info
    contains(QT_CONFIG, separate_debug_info_nocopy): CONFIG += separate_debug_info_nocopy
}

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+ or clang 3.1+
        greaterThan(QT_CLANG_MAJOR_VERSION, 3) | \
        if(equals(QT_CLANG_MAJOR_VERSION, 3):greaterThan(QT_CLANG_MINOR_VERSION, 1)) | \
        greaterThan(QT_APPLE_CLANG_MAJOR_VERSION, 3) {
            QMAKE_CXXFLAGS += -Werror -Wno-error=\\$${LITERAL_HASH}warnings $$WERROR
        }
    } else:intel_icc {
        # Intel CC 13.0+ (a.k.a. Intel Composer XE 2013)
        greaterThan(QT_ICC_MAJOR_VERSION, 12) {
            # 177: function "entity" was declared but never referenced
            #      (too aggressive; ICC reports even for functions created due to template instantiation)
            # 1224: #warning directive
            # 1881: argument must be a constant null pointer value
            #      (NULL in C++ is usually a literal 0)
            QMAKE_CXXFLAGS += -Werror -ww177,1224,1881 $$WERROR
        }
    } else:gcc {
        # GCC 4.6+
        # note: there was no GCC 3.6 and this assumes no one is crazy enough to compile Qt with GCC 2.7
        greaterThan(QT_GCC_MAJOR_VERSION, 4)|greaterThan(QT_GCC_MINOR_VERSION, 5) {
            QMAKE_CXXFLAGS += -Werror -Wno-error=cpp $$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 += -Wno-error=strict-overflow
        }
    }
}