Re: [Xen-devel] [PATCH v2 3/5] x86/mm: override stored file names for multiply built sources

[Martin Pohlack <mpohlack@xxxxxxxxxx>]

On 26.10.2015 12:51, Jan Beulich wrote:
> To make it possible to tell apart the static symbols therein, use their
> object file names instead of their source ones.
> 
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
> ---
> v2: Introduce __OBJECT_FILE__.
> 
> --- a/xen/Rules.mk
> +++ b/xen/Rules.mk
> @@ -42,10 +42,10 @@ ALL_OBJS-y               += $(BASEDIR)/x
>  ALL_OBJS-y               += $(BASEDIR)/arch/$(TARGET_ARCH)/built_in.o
>  ALL_OBJS-$(x86)          += $(BASEDIR)/crypto/built_in.o
>  
> -CFLAGS += -fno-builtin -fno-common
> +CFLAGS += -nostdinc -fno-builtin -fno-common
>  CFLAGS += -Werror -Wredundant-decls -Wno-pointer-arith
>  CFLAGS += -pipe -g -D__XEN__ -include $(BASEDIR)/include/xen/config.h
> -CFLAGS += -nostdinc
> +CFLAGS += '-D__OBJECT_FILE__="$@"'
>  
>  CFLAGS-$(XSM_ENABLE)    += -DXSM_ENABLE
>  CFLAGS-$(FLASK_ENABLE)  += -DFLASK_ENABLE
> --- a/xen/arch/x86/mm/guest_walk.c
> +++ b/xen/arch/x86/mm/guest_walk.c
> @@ -21,6 +21,9 @@
>   * along with this program; If not, see <http://www.gnu.org/licenses/>.
>   */
>  
> +/* Allow uniquely identifying static symbols in the 3 generated objects. */
> +asm(".file \"" __OBJECT_FILE__ "\"");
> +

I wonder if using symlinks to the C files and compiling those would be a
more obvious way to set the file symbol to something unique.

Martin

Amazon Development Center Germany GmbH
Krausenstr. 38
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Ust-ID: DE289237879
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