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[Xen-devel] x86_emulate/x86_emulate.c:2105: warning: comparison is alway

To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] x86_emulate/x86_emulate.c:2105: warning: comparison is always false due to limited range of data type
From: Teck Choon Giam <giamteckchoon@xxxxxxxxx>
Date: Mon, 1 Nov 2010 02:38:42 +0800
Delivery-date: Sun, 31 Oct 2010 11:39:41 -0700
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Hi,

Changeset 21377 in xen-4.0-testing.hg compile error:

gcc -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions
-fstack-protector --param=ssp-buffer-size=4 -m32 -march=i386
-mtune=generic -fasynchronous-unwind-tables -O1
-fno-omit-frame-pointer -fno-optimize-sibling-calls -m32 -march=i686
-g -fno-strict-aliasing -std=gnu99 -Wall -Wstrict-prototypes
-Wno-unused-value -Wdeclaration-after-statement  -O1
-fno-omit-frame-pointer -fno-optimize-sibling-calls -m32 -march=i686
-g -fno-strict-aliasing -std=gnu99 -Wall -Wstrict-prototypes
-Wno-unused-value -Wdeclaration-after-statement  -O1
-fno-omit-frame-pointer -fno-optimize-sibling-calls -m32 -march=i686
-g -fno-strict-aliasing -std=gnu99 -Wall -Wstrict-prototypes
-Wno-unused-value -Wdeclaration-after-statement  -nostdinc
-fno-builtin -fno-common -iwithprefix include -Werror
-Wno-pointer-arith -pipe
-I/builddir/build/BUILD/xen-4.0.2-rc1-pre-src/xen/include
-I/builddir/build/BUILD/xen-4.0.2-rc1-pre-src/xen/include/asm-x86/mach-generic
-I/builddir/build/BUILD/xen-4.0.2-rc1-pre-src/xen/include/asm-x86/mach-default
-msoft-float -fno-stack-protector -fno-exceptions -g -D__XEN__
-DVERBOSE -fno-omit-frame-pointer -DCONFIG_FRAME_POINTER -MMD -MF
.xen.d -O1 -fno-omit-frame-pointer -fno-optimize-sibling-calls -m32
-march=i686 -g -fno-strict-aliasing -std=gnu99 -Wall
-Wstrict-prototypes -Wno-unused-value -Wdeclaration-after-statement
-nostdinc -fno-builtin -fno-common -iwithprefix include -Werror
-Wno-pointer-arith -pipe
-I/builddir/build/BUILD/xen-4.0.2-rc1-pre-src/xen/include
-I/builddir/build/BUILD/xen-4.0.2-rc1-pre-src/xen/include/asm-x86/mach-generic
-I/builddir/build/BUILD/xen-4.0.2-rc1-pre-src/xen/include/asm-x86/mach-default
-msoft-float -fno-stack-protector -fno-exceptions -g -D__XEN__
-DVERBOSE -fno-omit-frame-pointer -DCONFIG_FRAME_POINTER -MMD -MF
.built_in.o.d -O1 -fno-omit-frame-pointer -fno-optimize-sibling-calls
-m32 -march=i686 -g -fno-strict-aliasing -std=gnu99 -Wall
-Wstrict-prototypes -Wno-unused-value -Wdeclaration-after-statement
-nostdinc -fno-builtin -fno-common -iwithprefix include -Werror
-Wno-pointer-arith -pipe
-I/builddir/build/BUILD/xen-4.0.2-rc1-pre-src/xen/include
-I/builddir/build/BUILD/xen-4.0.2-rc1-pre-src/xen/include/asm-x86/mach-generic
-I/builddir/build/BUILD/xen-4.0.2-rc1-pre-src/xen/include/asm-x86/mach-default
-msoft-float -fno-stack-protector -fno-exceptions -g -D__XEN__
-DVERBOSE -fno-omit-frame-pointer -DCONFIG_FRAME_POINTER -MMD -MF
.x86_emulate.o.d -c x86_emulate.c -o x86_emulate.o
cc1: warnings being treated as errors
In file included from x86_emulate.c:17:
x86_emulate/x86_emulate.c: In function 'x86_emulate':
x86_emulate/x86_emulate.c:2105: warning: comparison is always false
due to limited range of data type
make[4]: *** [x86_emulate.o] Error 1
make[4]: Leaving directory
`/builddir/build/BUILD/xen-4.0.2-rc1-pre-src/xen/arch/x86'
make[3]: *** 
[/builddir/build/BUILD/xen-4.0.2-rc1-pre-src/xen/arch/x86/built_in.o]
Error 2
make[3]: Leaving directory
`/builddir/build/BUILD/xen-4.0.2-rc1-pre-src/xen/arch/x86'
make[2]: *** [/builddir/build/BUILD/xen-4.0.2-rc1-pre-src/xen/xen] Error 2
make[2]: Leaving directory `/builddir/build/BUILD/xen-4.0.2-rc1-pre-src/xen'
make[1]: *** [install] Error 2
make[1]: Leaving directory `/builddir/build/BUILD/xen-4.0.2-rc1-pre-src/xen'
make: *** [install-xen] Error 2

Thanks.

Kindest regards,
Giam Teck Choon

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