[PATCH] reproducible builds: strip embedded file paths

[Vagrant Cascadian]

On 2021-11-22, Xiang W. wrote:
> 在 2021-11-21星期日的 11:20 -0800，Vagrant Cascadian写道：
>> of the directories below, I built using the same toolchain from
>> the same git commit...
>> 
>> $ cd /home/vagrant/src/opensbi/opensbi1
>> $ CROSS_COMPILE=riscv64-linux-gnu- make V=1 FW_PAYLOAD=n
>> PLATFORM=generic
>> ...
>> $ strings build/platform/generic/firmware/fw_dynamic.bin | grep
>> /home/vagrant
>> /home/vagrant/src/opensbi/opensbi1/lib/sbi/riscv_asm.c
...
> This is because the source file uses the absolute path when compiling,
> you can use the relative path by modifying the Makefile
>
> diff --git a/Makefile b/Makefile
> index 8623c1c..d017534 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -361,7 +361,7 @@ compile_cc_dep = $(CMD_PREFIX)mkdir -p `dirname
> $(1)`; \
>  	       -MM $(2) >> $(1) || rm -f $(1)
>  compile_cc = $(CMD_PREFIX)mkdir -p `dirname $(1)`; \
>  	     echo " CC        $(subst $(build_dir)/,,$(1))"; \
> -	     $(CC) $(CFLAGS) $(call dynamic_flags,$(1),$(2)) -c $(2) -
> o $(1)
> +	     $(CC) $(CFLAGS) $(call dynamic_flags,$(1),$(2)) -c
> $(subst $(src_dir)/,,$(2)) -o $(1)
>  compile_as_dep = $(CMD_PREFIX)mkdir -p `dirname $(1)`; \
>  	     echo " AS-DEP    $(subst $(build_dir)/,,$(1))"; \
>  	     printf %s `dirname $(1)`/ > $(1) && \

That solves the issue and is probably better than passing more compiler
arguments, thanks!


live well,
  vagrant
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