On Mon, Jan 10, 2022 at 03:15:25AM +0900, Masahiro Yamada wrote:
> 'export suffix-y' does not work reliably because hyphens are disallowed
> in shell variables.
>
> A similar issue was fixed by commit 2bfbe7881ee0 ("kbuild: Do not use
> hyphen in exported variable name").
>
> If I do similar in dash, ARCH=sh fails to build.
>
> $ mv linux linux~
> $ cd linux~
> $ dash
> $ make O=foo/bar ARCH=sh CROSS_COMPILE=sh4-linux-gnu- defconfig all
> make[1]: Entering directory '/home/masahiro/linux~/foo/bar'
> [ snip ]
> make[4]: *** No rule to make target 'arch/sh/boot/compressed/vmlinux.bin.', needed by 'arch/sh/boot/compressed/piggy.o'. Stop.
> make[3]: *** [/home/masahiro/linux~/arch/sh/boot/Makefile:40: arch/sh/boot/compressed/vmlinux] Error 2
> make[2]: *** [/home/masahiro/linux~/arch/sh/Makefile:194: zImage] Error 2
> make[1]: *** [/home/masahiro/linux~/Makefile:350: __build_one_by_one] Error 2
> make[1]: Leaving directory '/home/masahiro/linux~/foo/bar'
> make: *** [Makefile:219: __sub-make] Error 2
>
> The maintainer of GNU Make stated that there is no consistent way to
> export variables that do not meet the shell's naming criteria.
> (https://savannah.gnu.org/bugs/?55719)
>
> Consequently, you cannot use hyphens in exported variables.
>
> Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx>
> ---
Reviewed-by: Nicolas Schier <n.schier@xxxxxx>
>
> arch/sh/boot/Makefile | 16 ++++++++--------
> arch/sh/boot/compressed/Makefile | 2 +-
> 2 files changed, 9 insertions(+), 9 deletions(-)
>
> diff --git a/arch/sh/boot/Makefile b/arch/sh/boot/Makefile
> index 5c123f5b2797..1f5d2df3c7e0 100644
> --- a/arch/sh/boot/Makefile
> +++ b/arch/sh/boot/Makefile
> @@ -19,12 +19,12 @@ CONFIG_ZERO_PAGE_OFFSET ?= 0x00001000
> CONFIG_ENTRY_OFFSET ?= 0x00001000
> CONFIG_PHYSICAL_START ?= $(CONFIG_MEMORY_START)
>
> -suffix-y := bin
> -suffix-$(CONFIG_KERNEL_GZIP) := gz
> -suffix-$(CONFIG_KERNEL_BZIP2) := bz2
> -suffix-$(CONFIG_KERNEL_LZMA) := lzma
> -suffix-$(CONFIG_KERNEL_XZ) := xz
> -suffix-$(CONFIG_KERNEL_LZO) := lzo
> +suffix_y := bin
> +suffix_$(CONFIG_KERNEL_GZIP) := gz
> +suffix_$(CONFIG_KERNEL_BZIP2) := bz2
> +suffix_$(CONFIG_KERNEL_LZMA) := lzma
> +suffix_$(CONFIG_KERNEL_XZ) := xz
> +suffix_$(CONFIG_KERNEL_LZO) := lzo
>
> targets := zImage vmlinux.srec romImage uImage uImage.srec uImage.gz \
> uImage.bz2 uImage.lzma uImage.xz uImage.lzo uImage.bin \
> @@ -106,10 +106,10 @@ OBJCOPYFLAGS_uImage.srec := -I binary -O srec
> $(obj)/uImage.srec: $(obj)/uImage FORCE
> $(call if_changed,objcopy)
>
> -$(obj)/uImage: $(obj)/uImage.$(suffix-y)
> +$(obj)/uImage: $(obj)/uImage.$(suffix_y)
> @ln -sf $(notdir $<) $@
> @echo ' Image $@ is ready'
>
> export CONFIG_PAGE_OFFSET CONFIG_MEMORY_START CONFIG_BOOT_LINK_OFFSET \
> CONFIG_PHYSICAL_START CONFIG_ZERO_PAGE_OFFSET CONFIG_ENTRY_OFFSET \
> - KERNEL_MEMORY suffix-y
> + KERNEL_MEMORY suffix_y
> diff --git a/arch/sh/boot/compressed/Makefile b/arch/sh/boot/compressed/Makefile
> index cf3174df7859..c1eb9a62de55 100644
> --- a/arch/sh/boot/compressed/Makefile
> +++ b/arch/sh/boot/compressed/Makefile
> @@ -64,5 +64,5 @@ OBJCOPYFLAGS += -R .empty_zero_page
>
> LDFLAGS_piggy.o := -r --format binary --oformat $(ld-bfd) -T
>
> -$(obj)/piggy.o: $(obj)/vmlinux.scr $(obj)/vmlinux.bin.$(suffix-y) FORCE
> +$(obj)/piggy.o: $(obj)/vmlinux.scr $(obj)/vmlinux.bin.$(suffix_y) FORCE
> $(call if_changed,ld)
> --
> 2.32.0
>
