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authorPhilippe Mathieu-Daudé <philmd@redhat.com>2021-04-22 16:59:11 +0200
committerThomas Huth <thuth@redhat.com>2021-05-09 18:47:54 +0200
commitda231910d33084ccf63f07de210b145e0fa31d98 (patch)
tree75c9d527e4f0006f7c6041b4f074cbaedeb2602f /pc-bios/s390-ccw
parent3462ff35512e925df5ee8c079ed46d4c93b633a7 (diff)
pc-bios/s390-ccw: Silence GCC 11 stringop-overflow warning
When building on Fedora 34 (gcc version 11.0.0 20210210) we get: In file included from pc-bios/s390-ccw/main.c:11: In function ‘memset’, inlined from ‘boot_setup’ at pc-bios/s390-ccw/main.c:185:5, inlined from ‘main’ at pc-bios/s390-ccw/main.c:288:5: pc-bios/s390-ccw/libc.h:28:14: warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=] 28 | p[i] = c; | ~~~~~^~~ The offending code is: memset((char *)S390EP, 0, 6); where S390EP is a const address: #define S390EP 0x10008 The compiler doesn't know how big that pointed area is, so it assume that its length is zero. This has been reported as BZ#99578 to GCC: "gcc-11 -Warray-bounds or -Wstringop-overread warning when accessing a pointer from integer literal" https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99578 As this warning does us more harm than good in the BIOS code (where lot of direct accesses to low memory are done), silence this warning for all BIOS objects. Suggested-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com> Message-Id: <20210422145911.2513980-1-philmd@redhat.com> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Message-Id: <20210502174836.838816-4-thuth@redhat.com> [thuth: Use the pre-existing cc-option macro instead of adding a new one] Reviewed-by: Cornelia Huck <cohuck@redhat.com> Signed-off-by: Thomas Huth <thuth@redhat.com>
Diffstat (limited to 'pc-bios/s390-ccw')
-rw-r--r--pc-bios/s390-ccw/Makefile1
1 files changed, 1 insertions, 0 deletions
diff --git a/pc-bios/s390-ccw/Makefile b/pc-bios/s390-ccw/Makefile
index f0fe84c9eb..83fb1afb73 100644
--- a/pc-bios/s390-ccw/Makefile
+++ b/pc-bios/s390-ccw/Makefile
@@ -30,6 +30,7 @@ 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 := -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 += -fwrapv -fno-strict-aliasing -fno-asynchronous-unwind-tables
QEMU_CFLAGS += $(call cc-option, $(QEMU_CFLAGS), -fno-stack-protector)