qemu/ipxe-build-Disable-gcc-address-of-packed-member-warning.patch

From 0ee72a15887b838d967c3b05070d5ad86f0d729a Mon Sep 17 00:00:00 2001
From: Bruce Rogers <brogers@suse.com>
Date: Fri, 25 Jan 2019 10:29:16 -0700
Subject: [PATCH] [build] Disable gcc address of packed member warning

GCC 9.0 introduces a new warning for using pointers to packed
structure and union members. ipxe code is replete with this usage,
partly because the architectures it is designed for handle unaligned
accesses. Therefore this warning is not very helpful and since the
default build considers warnings to be errors, needs to be disabled.

[BR: BSC#1121464]
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 src/Makefile.housekeeping | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/Makefile.housekeeping b/src/Makefile.housekeeping
index f8334921..e7f1ece0 100644
--- a/src/Makefile.housekeeping
+++ b/src/Makefile.housekeeping
@@ -646,6 +646,17 @@ $(BIN)/.certificate.der.% : $(BIN)/.cert
 CERT_ALL := $(foreach i,$(call seq,1,$(CERT_COUNT)),\
 	      CERT ( $(i), \"$(word $(i),$(CERT_DERS))\" ))
 
+
+# GCC 9.0 introduces a new warning for using pointers to packed
+# structure and union members. ipxe code is replete with this usage,
+# partly because the architectures it is designed for handle unaligned
+# accesses. Therefore this warning is not very helpful and since the 
+# default build considers warnings to be errors, needs to be disabled.
+#
+WNAOPM_TEST = $(CC) -Waddress-of-packed-member -x c -c /dev/null -o /dev/null \
+		  >/dev/null 2>&1
+WNAOPM_FLAGS := $(shell $(WNAOPM_TEST) && $(ECHO) '-Wno-address-of-packed-member')
+WORKAROUND_CFLAGS += $(WNAOPM_FLAGS)
 endif
 
 certstore_DEPS += $(CERT_LIST) $(CERT_FILES) $(CERT_PEMS) $(CERT_DERS)
-- 
2.20.1