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From 56674ee1f25f12978a6a8a1390e11b55b3e0fabe Mon Sep 17 00:00:00 2001
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From: Thomas Huth <thuth@redhat.com>
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Date: Fri, 8 Jul 2022 20:49:01 +0200
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Subject: [PATCH 15/17] pc-bios/s390-ccw/netboot.mak: Ignore Clang's warnings
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about GNU extensions
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RH-Author: Thomas Huth <thuth@redhat.com>
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RH-MergeRequest: 106: pc-bios/s390-ccw: Fix boot from disks with 4k sectors that do not have the typical DASD geometry
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RH-Commit: [10/10] 037dab4df23ebb2b42871bca8c842a53a7204b50 (thuth/qemu-kvm-cs9)
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RH-Bugzilla: 2098077
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Acked-by: David Hildenbrand <david@redhat.com>
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RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
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Bugzilla: http://bugzilla.redhat.com/2098077
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commit e2269220acb03e6c6a460c3090d804835e202239
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Author: Thomas Huth <thuth@redhat.com>
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Date: Mon Jul 4 13:19:03 2022 +0200
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pc-bios/s390-ccw/netboot.mak: Ignore Clang's warnings about GNU extensions
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When compiling the s390-ccw bios with Clang (v14.0), there is currently
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an unuseful warning like this:
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CC pc-bios/s390-ccw/ipv6.o
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../../roms/SLOF/lib/libnet/ipv6.c:447:18: warning: variable length array
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folded to constant array as an extension [-Wgnu-folding-constant]
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unsigned short raw[ip6size];
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^
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SLOF is currently GCC-only and cannot be compiled with Clang yet, so
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it is expected that such extensions sneak in there - and as long as
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we don't want to compile the code with a compiler that is neither GCC
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or Clang, it is also not necessary to avoid such extensions.
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Thus these GNU-extension related warnings are completely useless in
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the s390-ccw bios, especially in the code that is coming from SLOF,
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so we should simply disable the related warnings here now.
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Message-Id: <20220704111903.62400-13-thuth@redhat.com>
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Signed-off-by: Thomas Huth <thuth@redhat.com>
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Signed-off-by: Thomas Huth <thuth@redhat.com>
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---
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pc-bios/s390-ccw/netboot.mak | 7 +++++--
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1 file changed, 5 insertions(+), 2 deletions(-)
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diff --git a/pc-bios/s390-ccw/netboot.mak b/pc-bios/s390-ccw/netboot.mak
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index 68b4d7edcb..ad41898cb6 100644
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--- a/pc-bios/s390-ccw/netboot.mak
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+++ b/pc-bios/s390-ccw/netboot.mak
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@@ -16,9 +16,12 @@ s390-netboot.elf: $(NETOBJS) libnet.a libc.a
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s390-netboot.img: s390-netboot.elf
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$(call quiet-command,$(STRIP) --strip-unneeded $< -o $@,"STRIP","$(TARGET_DIR)$@")
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+# SLOF is GCC-only, so ignore warnings about GNU extensions with Clang here
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+NO_GNU_WARN := $(call cc-option,-Werror $(QEMU_CFLAGS),-Wno-gnu)
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+
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# libc files:
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-LIBC_CFLAGS = $(QEMU_CFLAGS) $(CFLAGS) $(LIBC_INC) $(LIBNET_INC) \
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+LIBC_CFLAGS = $(QEMU_CFLAGS) $(CFLAGS) $(NO_GNU_WARN) $(LIBC_INC) $(LIBNET_INC) \
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-MMD -MP -MT $@ -MF $(@:%.o=%.d)
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CTYPE_OBJS = isdigit.o isxdigit.o toupper.o
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@@ -52,7 +55,7 @@ libc.a: $(LIBCOBJS)
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LIBNETOBJS := args.o dhcp.o dns.o icmpv6.o ipv6.o tcp.o udp.o bootp.o \
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dhcpv6.o ethernet.o ipv4.o ndp.o tftp.o pxelinux.o
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-LIBNETCFLAGS = $(QEMU_CFLAGS) $(CFLAGS) $(LIBC_INC) $(LIBNET_INC) \
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+LIBNETCFLAGS = $(QEMU_CFLAGS) $(CFLAGS) $(NO_GNU_WARN) $(LIBC_INC) $(LIBNET_INC) \
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-DDHCPARCH=0x1F -MMD -MP -MT $@ -MF $(@:%.o=%.d)
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%.o : $(SLOF_DIR)/lib/libnet/%.c
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--
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2.31.1
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