On Thu, Mar 4, 2021 at 5:47 AM 'Nick Desaulniers' via Clang Built
Linux <clang-built-linux@xxxxxxxxxxxxxxxx> wrote:
>
> + Sami
>
> On Wed, Mar 3, 2021 at 10:34 AM Masahiro Yamada <masahiroy@xxxxxxxxxx> wrote:
> >
> > This guarding is wrong. As Documentation/kbuild/llvm.rst notes, LLVM=1
> > switches the default of tools, but you can still override CC, LD, etc.
> > individually.
> >
> > BTW, LLVM is not 1/0 flag. If LLVM is not passed in, it is empty.
>
> Do we have the same problem with LLVM_IAS? LGTM otherwise, but wanted
> to check that before signing off.
3/4 will replace this LLVM_IAS check with AS_IS_LLVM.
We do not need to add a noise change.
>
> (Also, the rest of the patches in this series seem more related to
> DWARFv5 cleanups; this patch seems orthogonal while those are a
> visible progression).
Kind of orthogonal, but I am touching the same code hunk,
which would cause a merge conflict.
> >
> > Non-zero return code is all treated as failure anyway.
> >
> > So, $(success,test $(LLVM) -eq 1) and $(success,test "$(LLVM)" = 1)
> > works equivalently in the sense that both are expanded to 'n' if LLVM
> > is not given. The difference is that the former internally fails due
> > to syntax error.
> >
> > $ test ${LLVM} -eq 1
> > bash: test: -eq: unary operator expected
> > $ echo $?
> > 2
> >
> > $ test "${LLVM}" -eq 1
> > bash: test: : integer expression expected
> > $ echo $?
> > 2
> >
> > $ test "${LLVM}" = 1
> > echo $?
> > 1
> >
> > $ test -n "${LLVM}"
> > $ echo $?
> > 1
> >
> > Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx>
> > ---
> >
> > arch/Kconfig | 1 -
> > 1 file changed, 1 deletion(-)
> >
> > diff --git a/arch/Kconfig b/arch/Kconfig
> > index 2bb30673d8e6..2af10ebe5ed0 100644
> > --- a/arch/Kconfig
> > +++ b/arch/Kconfig
> > @@ -632,7 +632,6 @@ config HAS_LTO_CLANG
> > def_bool y
> > # Clang >= 11: https://github.com/ClangBuiltLinux/linux/issues/510
> > depends on CC_IS_CLANG && CLANG_VERSION >= 110000 && LD_IS_LLD
> > - depends on $(success,test $(LLVM) -eq 1)
>
> IIRC, we needed some other LLVM utilities like llvm-nm and llvm-ar,
> which are checked below. So I guess we can still support CC=clang
> AR=llvm-ar NM=llvm-nm, and this check is redundant.
Yes, I think so.
>
> > depends on $(success,test $(LLVM_IAS) -eq 1)
> > depends on $(success,$(NM) --help | head -n 1 | grep -qi llvm)
> > depends on $(success,$(AR) --help | head -n 1 | grep -qi llvm)
> > --
> > 2.27.0
> >
>
>
> --
> Thanks,
> ~Nick Desaulniers
>
> --
> You received this message because you are subscribed to the Google Groups "Clang Built Linux" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to clang-built-linux+unsubscribe@xxxxxxxxxxxxxxxx.
> To view this discussion on the web visit https://groups.google.com/d/msgid/clang-built-linux/CAKwvOdkhZGv_q9vgDdYY44OrbzmMD_E%2BGL3SyOk-jQ0kdXtMzg%40mail.gmail.com.
--
Best Regards
Masahiro Yamada
