<Qt> Wie kann ich eine Assembler-Datei einbinden und kompilieren?

QMAKE_CXXFLAGS += -save-temps
QMAKE_EXTRA_COMPILERS += nasm


QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = test---
TEMPLATE = app

DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += main.cpp\
        mainwindow.cpp\
        asm.s

HEADERS  += mainwindow.h

FORMS    += mainwindow.ui


asm.name = nasm ${QMAKE_FILE_IN}
nasm.input = ASM_FILES  #input variable. Muss ich ASM_FILES vielleicht mit asm.s ersetzen?
nasm.variable_out = LST_FILES
nasm.commands = nasm -f elf -g -F stabs ${QMAKE_FILE_IN} -l ${QMAKE_FILE_OUT}
nasm.output = $$OUT_PWD/${QMAKE_FILE_BASE}.lst
nasm.CONFIG += target_predeps

nasm_ld.name = nasm_ld ${QMAKE_FILE_IN}
nasm_ld.input = LST_FILES
nasm_ld.variable_out = OBJECTS
nasm_ld.commands = ld -o ${QMAKE_FILE_BASE} ${QMAKE_FILE_OUT}
nasm_ld.output = $$OUT_PWD/${QMAKE_FILE_BASE}.o
nasm_ld.CONFIG += target_predeps

QMAKE_EXTRA_COMPILERS  += nasm nasm_ld

ASM_FILES += asm.s

// code

extern "C" __int64 assembly(); // include assembly function

//code

void MainWindow::on_pushButton_clicked()
{
    __int64 num = assembly(); // Den Wert aus rax in num schieben
}

.code
.global
assembly proc

mov rax, 1  ;1 in rax
ret  ;return rax

xor rax, rax  ;rax = 0

assembly endp
end