On Fri, Feb 25, 2022 at 4:42 PM Guo Ren [off-list ref] wrote:

Hi Arnd & Palmer,

Here is the new modified compat_vdso/Makefile, please have a look,
first. Then I would update it to v7:
===========================================
# SPDX-License-Identifier: GPL-2.0-only
#
# Makefile for compat_vdso
#

# Symbols present in the compat_vdso
compat_vdso-syms  = rt_sigreturn
compat_vdso-syms += getcpu
compat_vdso-syms += flush_icache

ifdef CROSS_COMPILE_COMPAT
        COMPAT_CC := $(CROSS_COMPILE_COMPAT)gcc
        COMPAT_LD := $(CROSS_COMPILE_COMPAT)ld
else
        COMPAT_CC := $(CC)
        COMPAT_LD := $(LD)
endif

COMPAT_CC_FLAGS := -march=rv32g -mabi=ilp32
COMPAT_LD_FLAGS := -melf32lriscv

Have you come across a case in which a separate cross toolchain
is required? If not, I would leave this out and just set the flags for the
normal toolchain.

I also think it would be a nicer split to build the two vdso variants
as vdso64/vdso32 rather than vdso/compat_vdso. That way,
the build procedure can be kept as close as possible to the
native 32-bit build.

        Arnd

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