Misuse of LFLAGS an LDFLAGS breaks compilation

When compiling Qt 5.4-rc I have the following error:

/usr/bin/ld.gold -Wl,-O1,--sort-common,--as-needed,-z,relro -Wl,--gc-sections -Wl,-O1 -fuse-ld=gold -o ../../../bin/rcc .obj/rcc.o .obj/main.o   -L/D/QT/qt-everywhere-opensource-src-5.4.0-rc/qtbase/lib -lQt5Bootstrap -lz -lpthread 
/usr/bin/ld.gold: -Wl,-O1,--sort-common,--as-needed,-z,relro: unknown option

Binutils 2.24 Arch Linux x86-64

As I understand Qt uses QMAKE_LFLAGS
This variable contains a general set of flags that are passed to the linker.
But somehow system LDFLAGS (that are passed to the compiler) are transformed to QMAKE_LFLAGS, that breaks compilation. QMAKE_LFLAGS passes options to the linker, LDFLAGS passes options to the compiler. The lines of options are not interchangeable.

But qtbase/configure simply converts both:

for varname in $SYSTEM_VARIABLES; do
    qmakevarname="${varname}"
    # use LDFLAGS for autoconf compat, but qmake uses QMAKE_LFLAGS
    if [ "${varname}" = "LDFLAGS" ]; then
        qmakevarname="LFLAGS"
    elif [ "${varname}" = "LD" ]; then
        qmakevarname="LINK"
    fi
    cmd=`echo \
'if [ -n "\$'${varname}'" ]; then
    QMakeVar set QMAKE_'${qmakevarname}' "\$'${varname}'"
fi'`

ld exits when you use -Wl option:

ld -Wl
ld: unrecognized option '-Wl'

The same situation with qtbase/mkspecs/common/g++-unix.conf:

QMAKE_LFLAGS_RELEASE += -Wl,-O1
This options also pass directly to the linker, that breaks compilation.

ld -Wl
ld: unrecognized option '-Wl'