[kvm-unit-tests PATCH v4 1/5] kbuild: allow multiple asm-offsets file to be generated

[Andrew Jones]

On Mon, Nov 25, 2024 at 05:21:50PM +0100, Clément Léger wrote:
> In order to allow multiple asm-offsets files to generated the include
> guard need to be different between these file. Add a asm_offset_name
> makefile macro to obtain an uppercase name matching the original asm
> offsets file.
> 
> Signed-off-by: Clément Léger <cleger at rivosinc.com>
> ---
>  scripts/asm-offsets.mak | 22 +++++++++++++++-------
>  1 file changed, 15 insertions(+), 7 deletions(-)
> 
> diff --git a/scripts/asm-offsets.mak b/scripts/asm-offsets.mak
> index 7b64162d..a5fdbf5d 100644
> --- a/scripts/asm-offsets.mak
> +++ b/scripts/asm-offsets.mak
> @@ -15,10 +15,14 @@ define sed-y
>  	s:->::; p;}'
>  endef
>  
> +define asm_offset_name
> +	$(shell echo $(notdir $(1)) | tr [:lower:]- [:upper:]_)
> +endef
> +
>  define make_asm_offsets
>  	(set -e; \
> -	 echo "#ifndef __ASM_OFFSETS_H__"; \
> -	 echo "#define __ASM_OFFSETS_H__"; \
> +	 echo "#ifndef __$(strip $(asm_offset_name))_H__"; \
> +	 echo "#define __$(strip $(asm_offset_name))_H__"; \
>  	 echo "/*"; \
>  	 echo " * Generated file. DO NOT MODIFY."; \
>  	 echo " *"; \
> @@ -29,12 +33,16 @@ define make_asm_offsets
>  	 echo "#endif" ) > $@
>  endef
>  
> -$(asm-offsets:.h=.s): $(asm-offsets:.h=.c)
> -	$(CC) $(CFLAGS) -fverbose-asm -S -o $@ $<
> +define gen_asm_offsets_rules
> +$(1).s: $(1).c
> +	$(CC) $(CFLAGS) -fverbose-asm -S -o $$@ $$<
> +
> +$(1).h: $(1).s
> +	$$(call make_asm_offsets,$(1))
> +	cp -f $$@ lib/generated/
> +endef
>  
> -$(asm-offsets): $(asm-offsets:.h=.s)
> -	$(call make_asm_offsets)
> -	cp -f $(asm-offsets) lib/generated/
> +$(foreach o,$(asm-offsets),$(eval $(call gen_asm_offsets_rules, $(o:.h=))))
>  
>  OBJDIRS += lib/generated
>  
> -- 
> 2.45.2
>

Reviewed-by: Andrew Jones <andrew.jones at linux.dev>