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Re: [PATCH] Build compiler checksum from object files
- From: Pedro Alves <pedro at codesourcery dot com>
- To: gcc-patches at gcc dot gnu dot org
- Cc: Andi Kleen <andi at firstfloor dot org>, Andi Kleen <ak at linux dot intel dot com>
- Date: Thu, 7 Oct 2010 13:58:39 +0100
- Subject: Re: [PATCH] Build compiler checksum from object files
- References: <1286454385-3116-1-git-send-email-andi@firstfloor.org>
On Thursday 07 October 2010 13:26:25, Andi Kleen wrote:
> -dummy-checksum.o : dummy-checksum.c $(CONFIG_H) $(SYSTEM_H)
> +.PHONY: checksum-options
>
> -cc1-dummy$(exeext): $(C_OBJS) dummy-checksum.o $(BACKEND) $(LIBDEPS)
> - +$(LINKER) $(ALL_LINKERFLAGS) $(LDFLAGS) -o $@ $(C_OBJS) \
> - dummy-checksum.o $(BACKEND) $(LIBS) $(BACKENDLIBS)
> +checksum-options:
> + echo "$(LINKER) $(ALL_LINKERFLAGS) $(LDFLAGS)" > checksum-options
I guess this could write to a temporary and do move-if-change.
>
> -cc1-checksum.c : cc1-dummy$(exeext) build/genchecksum$(build_exeext)
> - build/genchecksum$(build_exeext) cc1-dummy$(exeext) > $@
> +# compute checksum over all object files and the options
> +cc1-checksum.c : build/genchecksum$(build_exeext) checksum-options \
> + $(C_OBJS) $(BACKEND) $(LIBDEPS)
> + build/genchecksum$(build_exeext) $(C_OBJS) $(BACKEND) $(LIBDEPS) \
> + checksum-options > $@
and so you could remove the .PHONY above, so that this isn't rebuilt
everytime, and so that cc1 isn't relinked everytime, even if nothing
changed.
--
Pedro Alves