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Message-ID: <20200415144217.cxxdfeeepzgikp4n@google.com>
Date: Wed, 15 Apr 2020 07:42:17 -0700
From: Fangrui Song <maskray@...gle.com>
To: Ilie Halip <ilie.halip@...il.com>
Cc: linux-riscv@...ts.infradead.org,
Jordan Rupprecht <rupprecht@...gle.com>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Thomas Gleixner <tglx@...utronix.de>,
Mao Han <han_mao@...ky.com>, linux-kernel@...r.kernel.org,
clang-built-linux@...glegroups.com
Subject: Re: [PATCH v2] riscv: fix vdso build with lld
On 2020-04-15, Ilie Halip wrote:
>When building with the LLVM linker this error occurrs:
> LD arch/riscv/kernel/vdso/vdso-syms.o
> ld.lld: error: no input files
>
>This happens because the lld treats -R as an alias to -rpath, as opposed
>to ld where -R means --just-symbols.
>
>Use the long option name for compatibility between the two.
>
>Link: https://github.com/ClangBuiltLinux/linux/issues/805
>Reported-by: Dmitry Golovin <dima@...ovin.in>
>Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
>Signed-off-by: Ilie Halip <ilie.halip@...il.com>
>
>---
>Changed in v2:
> * a comment line dropped, another one slightly reworded
> * added Nick's Reviewed-by
>---
> arch/riscv/kernel/vdso/Makefile | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
>diff --git a/arch/riscv/kernel/vdso/Makefile b/arch/riscv/kernel/vdso/Makefile
>index 33b16f4212f7..a4ee3a0e7d20 100644
>--- a/arch/riscv/kernel/vdso/Makefile
>+++ b/arch/riscv/kernel/vdso/Makefile
>@@ -33,15 +33,15 @@ $(obj)/vdso.so.dbg: $(src)/vdso.lds $(obj-vdso) FORCE
> $(call if_changed,vdsold)
>
> # We also create a special relocatable object that should mirror the symbol
>-# table and layout of the linked DSO. With ld -R we can then refer to
>-# these symbols in the kernel code rather than hand-coded addresses.
>+# table and layout of the linked DSO. With ld --just-symbols we can then
>+# refer to these symbols in the kernel code rather than hand-coded addresses.
>
> SYSCFLAGS_vdso.so.dbg = -shared -s -Wl,-soname=linux-vdso.so.1 \
> -Wl,--build-id -Wl,--hash-style=both
> $(obj)/vdso-dummy.o: $(src)/vdso.lds $(obj)/rt_sigreturn.o FORCE
> $(call if_changed,vdsold)
>
>-LDFLAGS_vdso-syms.o := -r -R
>+LDFLAGS_vdso-syms.o := -r --just-symbols
> $(obj)/vdso-syms.o: $(obj)/vdso-dummy.o FORCE
> $(call if_changed,ld)
>
>--
>2.17.1
https://lore.kernel.org/linux-riscv/20200402175354.pzhzhumlqsjk66nu@google.com/
Reviewed-by: Fangrui Song <maskray@...gle.com>
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