Re: [PATCH 2/3] pc-bios/s390-ccw/Makefile: Check more compiler flags for Clang

[Philippe Mathieu-Daudé]

+Richard

On 5/12/21 7:15 PM, Thomas Huth wrote:
> Older versions of Clang do not like -fno-delete-null-pointer-checks
> or -msoft-float. So let's add a proper check for those.
> 
> Signed-off-by: Thomas Huth <thuth@redhat.com>
> ---
>  pc-bios/s390-ccw/Makefile | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/pc-bios/s390-ccw/Makefile b/pc-bios/s390-ccw/Makefile
> index cee9d2c63b..97008d94c9 100644
> --- a/pc-bios/s390-ccw/Makefile
> +++ b/pc-bios/s390-ccw/Makefile
> @@ -31,10 +31,11 @@ OBJECTS = start.o main.o bootmap.o jump2ipl.o sclp.o 
> menu.o \
>  
>  QEMU_CFLAGS := -Wall $(filter -W%, $(QEMU_CFLAGS))
>  QEMU_CFLAGS += $(call cc-option,-Werror 
> $(QEMU_CFLAGS),-Wno-stringop-overflow)
> -QEMU_CFLAGS += -ffreestanding -fno-delete-null-pointer-checks -fno-common 
> -fPIE
> +QEMU_CFLAGS += -ffreestanding -fno-common -fPIE

OK

>  QEMU_CFLAGS += -fwrapv -fno-strict-aliasing -fno-asynchronous-unwind-tables
> -QEMU_CFLAGS += $(call cc-option, $(QEMU_CFLAGS), -fno-stack-protector)
> -QEMU_CFLAGS += -msoft-float
> +QEMU_CFLAGS += $(call cc-option,-Werror 
> $(QEMU_CFLAGS),-fno-delete-null-pointer-checks)
> +QEMU_CFLAGS += $(call cc-option,-Werror $(QEMU_CFLAGS),-fno-stack-protector)

OK

> +QEMU_CFLAGS += $(call cc-option,-Werror $(QEMU_CFLAGS),-msoft-float)

For this one I don't understand clang... How to enforce no floating
point code generation?

>  QEMU_CFLAGS += $(call cc-option, $(QEMU_CFLAGS),-march=z900,-march=z10)
>  QEMU_CFLAGS += -std=gnu99
>  LDFLAGS += -Wl,-pie -nostdlib
>