Re: [Xen-devel] x86_emulate/x86_emulate.c:2105: warning: comparison is always false due to limited range of data type

[Keir Fraser <keir@xxxxxxx>]

Clever compiler. Should be fixed by xen-4.0-testing:21378.

 Thanks,
 Keir

On 31/10/2010 18:38, "Teck Choon Giam" <giamteckchoon@xxxxxxxxx> wrote:

> 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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> http://lists.xensource.com/xen-devel



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