pc-bios/s390-ccw: Allow building with Clang, too
Clang unfortunately does not support generating code for the z900 architecture level and starts with the z10 instead. Thus to be able to support compiling with Clang, we have to check for the supported compiler flags. The disadvantage is of course that the bios image will only run with z10 guest CPUs upwards (which is what most people use anyway), so just in case let's also emit a warning in that case (we will continue to ship firmware images that have been pre-built with GCC in future releases, so this should not impact normal users, too). Message-Id: <20210502174836.838816-5-thuth@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Signed-off-by: Thomas Huth <thuth@redhat.com>
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@ -5417,9 +5417,16 @@ if { test "$cpu" = "i386" || test "$cpu" = "x86_64"; } && \
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fi
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fi
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# Only build s390-ccw bios if we're on s390x and the compiler has -march=z900
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# Only build s390-ccw bios if we're on s390x and the compiler has -march=z900
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# or -march=z10 (which is the lowest architecture level that Clang supports)
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if test "$cpu" = "s390x" ; then
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if test "$cpu" = "s390x" ; then
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write_c_skeleton
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write_c_skeleton
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if compile_prog "-march=z900" ""; then
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compile_prog "-march=z900" ""
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has_z900=$?
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if [ $has_z900 = 0 ] || compile_prog "-march=z10" ""; then
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if [ $has_z900 != 0 ]; then
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echo "WARNING: Your compiler does not support the z900!"
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echo " The s390-ccw bios will only work with guest CPUs >= z10."
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fi
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roms="$roms s390-ccw"
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roms="$roms s390-ccw"
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# SLOF is required for building the s390-ccw firmware on s390x,
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# SLOF is required for building the s390-ccw firmware on s390x,
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# since it is using the libnet code from SLOF for network booting.
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# since it is using the libnet code from SLOF for network booting.
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@ -34,7 +34,8 @@ QEMU_CFLAGS += $(call cc-option,-Werror $(QEMU_CFLAGS),-Wno-stringop-overflow)
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QEMU_CFLAGS += -ffreestanding -fno-delete-null-pointer-checks -fno-common -fPIE
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QEMU_CFLAGS += -ffreestanding -fno-delete-null-pointer-checks -fno-common -fPIE
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QEMU_CFLAGS += -fwrapv -fno-strict-aliasing -fno-asynchronous-unwind-tables
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QEMU_CFLAGS += -fwrapv -fno-strict-aliasing -fno-asynchronous-unwind-tables
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QEMU_CFLAGS += $(call cc-option, $(QEMU_CFLAGS), -fno-stack-protector)
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QEMU_CFLAGS += $(call cc-option, $(QEMU_CFLAGS), -fno-stack-protector)
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QEMU_CFLAGS += -msoft-float -march=z900
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QEMU_CFLAGS += -msoft-float
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QEMU_CFLAGS += $(call cc-option, $(QEMU_CFLAGS),-march=z900,-march=z10)
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QEMU_CFLAGS += -std=gnu99
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QEMU_CFLAGS += -std=gnu99
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LDFLAGS += -Wl,-pie -nostdlib
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LDFLAGS += -Wl,-pie -nostdlib
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