File Workaround-compilation-error-with-gcc-9..patch of Package qemu.21548

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File Workaround-compilation-error-with-gcc-9..patch of Package qemu.21548

From: Valentine Barshak <gvaxon@gmail.com>
Date: Mon, 22 Jul 2019 10:47:50 +0100
Subject: Workaround compilation error with gcc 9.1

References: bsc#1121464

Compiling with gcc 9.1 generates lots of "taking address of packed
member of ... may result in an unaligned pointer value" warnings.

Some of these warnings are genuine, and indicate correctly that parts
of iPXE currently require the CPU (or runtime environment) to support
unaligned accesses.  For example: the TCP/IP receive data path will
attempt to access 32-bit fields that may not be aligned to a 32-bit
boundary.

Other warnings are either spurious (such as when the pointer is to a
variable-length byte array, which can have no alignment requirement
anyway) or unhelpful (such as when the pointer is used solely to
provide a debug colour value for the DBGC() macro).

There appears to be no easy way to silence the spurious warnings.
Since the ability to perform unaligned accesses is already a
requirement for iPXE, work around the problem by silencing this class
of warnings.

Signed-off-by: Valentine Barshak <gvaxon@gmail.com>
Modified-by: Michael Brown <mcb30@ipxe.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 src/Makefile.housekeeping | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/roms/ipxe/src/Makefile.housekeeping b/roms/ipxe/src/Makefile.housekeeping
index 97fa325bb52314e05192d0414436..e5f6927de889167d286ccfcdda92 100644
--- a/roms/ipxe/src/Makefile.housekeeping
+++ b/roms/ipxe/src/Makefile.housekeeping
@@ -185,6 +185,15 @@ WNST_TEST = $(CC) -Wstringop-truncation -x c -c /dev/null -o /dev/null \
 		  >/dev/null 2>&1
 WNST_FLAGS := $(shell $(WNST_TEST) && $(ECHO) '-Wno-stringop-truncation')
 WORKAROUND_CFLAGS += $(WNST_FLAGS)
+
+# gcc 9.1 generates warnings for taking address of packed member which
+# may result in an unaligned pointer value.  Inhibit the warnings.
+#
+WNAPM_TEST = $(CC) -Wno-address-of-packed-member -x c -c /dev/null \
+		   -o /dev/null >/dev/null 2>&1
+WNAPM_FLAGS := $(shell $(WNAPM_TEST) && \
+		 $(ECHO) '-Wno-address-of-packed-member')
+WORKAROUND_CFLAGS += $(WNAPM_FLAGS)
 endif
 
 # Some versions of gas choke on division operators, treating them as

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File Workaround-compilation-error-with-gcc-9..patch of Package qemu.21548

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