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From eda3b6620e779ff89df46a0fb9022016bffd7f44 Mon Sep 17 00:00:00 2001
From: Thomas Huth <>
Date: Fri, 9 Oct 2020 10:08:41 -0400
Subject: [PATCH 05/14] pc-bios/s390-ccw/Makefile: Compile with -std=gnu99,
 -fwrapv and -fno-common

RH-Author: Thomas Huth <>
Message-id: <>
Patchwork-id: 98595
O-Subject: [RHEL-8.4.0 qemu-kvm PATCH 1/9] pc-bios/s390-ccw/Makefile: Compile with -std=gnu99, -fwrapv and -fno-common
Bugzilla: 1846975
RH-Acked-by: Jens Freimann <>
RH-Acked-by: David Hildenbrand <>
RH-Acked-by: Cornelia Huck <>

The main QEMU code is compiled with -std=gnu99, -fwrapv and -fno-common.
We should use the same flags for the s390-ccw bios, too, to avoid that
we get different behavior with different compiler versions that changed
their default settings in the course of time (it happened at least with
-std=... and -fno-common in the past already).

While we're at it, also group the other flags here in a little bit nicer
fashion: Move the two "-m" flags out of the "-f" area and specify them on
a separate line.

Reviewed-by: Claudio Imbrenda <>
Acked-by: Cornelia Huck <>
Acked-by: Janosch Frank <>
Message-Id: <>
Signed-off-by: Thomas Huth <>
(cherry picked from commit 4f6a1eb886961f1f9da2d553c4b0e5ef69cd3801)
Conflicts: Simple contextual conflict due to meson reworks in upstream
Signed-off-by: Thomas Huth <>
Signed-off-by: Danilo C. L. de Paula <>
 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 a048b6b077..e776a2a5ec 100644
--- a/pc-bios/s390-ccw/Makefile
+++ b/pc-bios/s390-ccw/Makefile
@@ -13,10 +13,11 @@ OBJECTS = start.o main.o bootmap.o jump2ipl.o sclp.o menu.o \
 	  virtio.o virtio-scsi.o virtio-blkdev.o libc.o cio.o dasd-ipl.o
 QEMU_CFLAGS := $(filter -W%, $(QEMU_CFLAGS))
-QEMU_CFLAGS += -ffreestanding -fno-delete-null-pointer-checks -msoft-float
-QEMU_CFLAGS += -march=z900 -fPIE -fno-strict-aliasing
-QEMU_CFLAGS += -fno-asynchronous-unwind-tables
+QEMU_CFLAGS += -ffreestanding -fno-delete-null-pointer-checks -fno-common -fPIE
+QEMU_CFLAGS += -fwrapv -fno-strict-aliasing -fno-asynchronous-unwind-tables
 QEMU_CFLAGS += $(call cc-option, $(QEMU_CFLAGS), -fno-stack-protector)
+QEMU_CFLAGS += -msoft-float -march=z900
+QEMU_CFLAGS += -std=gnu99
 LDFLAGS += -Wl,-pie -nostdlib
 build-all: s390-ccw.img s390-netboot.img