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[Qemu-devel] Build failure on git master


From: Mark Cave-Ayland
Subject: [Qemu-devel] Build failure on git master
Date: Wed, 19 Jul 2017 18:09:44 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1

Hi all,

I see the following build failure here on git master with gcc 4.7.2:

cc -I/home/build/src/qemu/git/qemu/block -Iblock
-I/home/build/src/qemu/git/qemu/tcg
-I/home/build/src/qemu/git/qemu/tcg/i386
-I/home/build/src/qemu/git/qemu/linux-headers
-I/home/build/src/qemu/git/qemu/linux-headers -I.
-I/home/build/src/qemu/git/qemu
-I/home/build/src/qemu/git/qemu/accel/tcg
-I/home/build/src/qemu/git/qemu/include -I/usr/include/pixman-1
-I/home/build/src/qemu/git/qemu/dtc/libfdt -Werror -pthread
-I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include
-m64 -mcx16 -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
-Wstrict-prototypes -Wredundant-decls -Wall -Wundef -Wwrite-strings
-Wmissing-prototypes -fno-strict-aliasing -fno-common -fwrapv
-Wendif-labels -Wno-missing-include-dirs -Wempty-body -Wnested-externs
-Wformat-security -Wformat-y2k -Winit-self -Wignored-qualifiers
-Wold-style-declaration -Wold-style-definition -Wtype-limits
-fstack-protector-all -I/usr/include/p11-kit-1
-I/usr/include/libpng12   -I/home/build/src/qemu/git/qemu/tests -MMD -MP
-MT block/vpc.o -MF block/vpc.d -O2 -U_FORTIFY_SOURCE
-D_FORTIFY_SOURCE=2 -g   -c -o block/vpc.o block/vpc.c
block/vpc.c: In function ‘vpc_co_pwritev’:
block/vpc.c:652:9: error: ‘ret’ may be used uninitialized in this
function [-Werror=maybe-uninitialized]
cc1: all warnings being treated as errors
make: *** [block/vpc.o] Error 1

At a quick glance it looks as if this is being caused by commit cfc87e00
"block/vpc.c: Handle write failures in get_image_offset()".


ATB,

Mark.



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