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SubjectRe: [PATCH 19/19] arm64: vdso32: Enable Clang Compilation
On Thu, Feb 13, 2020 at 04:16:14PM +0000, Vincenzo Frascino wrote:
> Enable Clang Compilation for the vdso32 library.
>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Will Deacon <will@kernel.org>
> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
> ---
> arch/arm64/kernel/vdso32/Makefile | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm64/kernel/vdso32/Makefile b/arch/arm64/kernel/vdso32/Makefile
> index 04df57b43cb1..209639101044 100644
> --- a/arch/arm64/kernel/vdso32/Makefile
> +++ b/arch/arm64/kernel/vdso32/Makefile
> @@ -11,8 +11,10 @@ include $(srctree)/lib/vdso/Makefile
> # Same as cc-*option, but using CC_COMPAT instead of CC
> ifeq ($(CONFIG_CC_IS_CLANG), y)
> CC_COMPAT ?= $(CC)
> +LD_COMPAT ?= $(CROSS_COMPILE_COMPAT)gcc

Well this is unfortunate :/

It looks like adding the --target flag to VDSO_LDFLAGS allows
clang to link the vDSO just fine although it does warn that -nostdinc
is unused:

clang-11: warning: argument unused during compilation: '-nostdinc'
[-Wunused-command-line-argument]

It would be nice if the logic of commit fe00e50b2db8 ("ARM: 8858/1:
vdso: use $(LD) instead of $(CC) to link VDSO") could be adopted here
but I get that this Makefile is its own beast :) at the very least, I
think that the --target flag should be added to VDSO_LDFLAGS so that gcc
is not a requirement for this but I am curious if you tried that already
and noticed any issues with it.

Cheers,
Nathan

> else
> CC_COMPAT ?= $(CROSS_COMPILE_COMPAT)gcc
> +LD_COMPAT ?= $(CC_COMPAT)
> endif
>
> cc32-option = $(call try-run,\
> @@ -171,7 +173,7 @@ quiet_cmd_vdsold_and_vdso_check = LD32 $@
> cmd_vdsold_and_vdso_check = $(cmd_vdsold); $(cmd_vdso_check)
>
> quiet_cmd_vdsold = LD32 $@
> - cmd_vdsold = $(CC_COMPAT) -Wp,-MD,$(depfile) $(VDSO_LDFLAGS) \
> + cmd_vdsold = $(LD_COMPAT) -Wp,-MD,$(depfile) $(VDSO_LDFLAGS) \
> -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@
> quiet_cmd_vdsocc = CC32 $@
> cmd_vdsocc = $(CC_COMPAT) -Wp,-MD,$(depfile) $(VDSO_CFLAGS) -c -o $@ $<
> --
> 2.25.0
>

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