File openSUSE-build-Silence-GCC-12-spurious-w.patch of Package qemu

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File openSUSE-build-Silence-GCC-12-spurious-w.patch of Package qemu

From: =?UTF-8?q?Martin=20Li=C5=A1ka?= <martin.liska@suse.com>
Date: Tue, 22 Mar 2022 10:52:19 +0100
Subject: [openSUSE] [build] Silence GCC 12 spurious warnings
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References: bsc#1197018

With GCC 12, build fails like this:

[ 6245s]     inlined from 'memcpy_user' at
arch/x86/include/librm.h:155:2,
[ 6245s]     inlined from 'copy_from_user' at
include/ipxe/uaccess.h:338:2,
[ 6245s]     inlined from 'acpi_sx_zsdt' at core/acpi.c:217:3:
[ 6245s] arch/x86/include/bits/string.h:79:32: error: array subscript
'union <anonymous>[0]' is partly outside array bounds of 'union
<anonymous>[1]' [-Werror=array-bounds]
[ 6245s]    79 |                 dest_u->u32[0] = src_u->u32[0];
[ 6245s]       |                 ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~
[ 6245s] core/acpi.c: In function 'acpi_sx_zsdt':
[ 6245s] core/acpi.c:191:11: note: object 'buf' of size 4
[ 6245s]   191 |         } buf;
[ 6245s]       |           ^~~

Which is a false positive reported by GCC compiler:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98503

Silence the watning.

Signed-off-by: Martin Liška <martin.liska@suse.com>

Upstream, this is done by commit:
b0ded89e917b48b73097d3b8b88dfa3afb264ed0 ([build] Disable
dangling pointer checking for GCC)

Signed-off-by: Dario Faggioli <dfaggioli@suse.com>
---
 src/Makefile.housekeeping | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/roms/ipxe/src/Makefile.housekeeping b/roms/ipxe/src/Makefile.housekeeping
index 36cfb950e014914232f254b7edbb..cad327d31dbe0bd69d956c32d28d 100644
--- a/roms/ipxe/src/Makefile.housekeeping
+++ b/roms/ipxe/src/Makefile.housekeeping
@@ -183,6 +183,19 @@ WNAPM_TEST = $(CC) -Wno-address-of-packed-member -x c -c /dev/null \
 WNAPM_FLAGS := $(shell $(WNAPM_TEST) && \
 		 $(ECHO) '-Wno-address-of-packed-member')
 WORKAROUND_CFLAGS += $(WNAPM_FLAGS)
+
+# gcc 12.1 generates false positive warnings.  Inhibit the warnings.
+WNAB_TEST = $(CC) -Wno-array-bounds -x c -c /dev/null \
+		   -o /dev/null >/dev/null 2>&1
+WNAB_FLAGS := $(shell $(WNAB_TEST) && \
+	      $(ECHO) '-Wno-array-bounds')
+WORKAROUND_CFLAGS += $(WNAB_FLAGS)
+
+WNDP_TEST = $(CC) -Wno-dangling-pointer-x c -c /dev/null \
+		  -o /dev/null >/dev/null 2>&1
+WNDP_FLAGS := $(shell $(WNAB_TEST) && \
+	       $(ECHO) '-Wno-dangling-pointer')
+WORKAROUND_CFLAGS += $(WNDP_FLAGS)
 endif
 
 # Some versions of gas choke on division operators, treating them as

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File openSUSE-build-Silence-GCC-12-spurious-w.patch of Package qemu

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