linux-kernel - Re: [PATCH for 5.2 12/12] rseq/selftests: add -no-integrated-as for clang

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Date:   Mon, 29 Apr 2019 13:30:14 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:     shuah <shuah@...nel.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-api <linux-api@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Andy Lutomirski <luto@...capital.net>,
        Dave Watson <davejwatson@...com>, Paul Turner <pjt@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Russell King <linux@....linux.org.uk>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Andi Kleen <andi@...stfloor.org>,
        Chris Lameter <cl@...ux.com>, Ben Maurer <bmaurer@...com>,
        rostedt <rostedt@...dmis.org>,
        Josh Triplett <josh@...htriplett.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Joel Fernandes <joelaf@...gle.com>,
        linux-kselftest <linux-kselftest@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH for 5.2 12/12] rseq/selftests: add -no-integrated-as for clang

On Mon, Apr 29, 2019 at 1:28 PM Mathieu Desnoyers
<mathieu.desnoyers@...icios.com> wrote:
>
> ----- On Apr 29, 2019, at 1:03 PM, ndesaulniers ndesaulniers@...gle.com wrote:
>
> > On Mon, Apr 29, 2019 at 8:29 AM Mathieu Desnoyers
> > <mathieu.desnoyers@...icios.com> wrote:
> >> diff --git a/tools/testing/selftests/rseq/Makefile
> >> b/tools/testing/selftests/rseq/Makefile
> >> index c30c52e1d0d2..d6469535630a 100644
> >> --- a/tools/testing/selftests/rseq/Makefile
> >> +++ b/tools/testing/selftests/rseq/Makefile
> >> @@ -1,5 +1,11 @@
> >>  # SPDX-License-Identifier: GPL-2.0+ OR MIT
> >> -CFLAGS += -O2 -Wall -g -I./ -I../../../../usr/include/ -L./ -Wl,-rpath=./
> >> +
> >> +ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
> >> +CLANG_FLAGS += -no-integrated-as
> >> +endif
> >> +
> >> +CFLAGS += -O2 -Wall -g -I./ -I../../../../usr/include/ -L./ -Wl,-rpath=./ \
> >> +         $(CLANG_FLAGS)
> >
> > The top level Makefile exports $(CLANG_FLAGS), which should contain
> > `-no-integrated-as`.  Is that available here?  If so, then you can
> > just add `$(CLANG_FLAGS)`, no compiler check needed.
>
> AFAIU, the makefiles under tools/testing/selftests all end up including
> tools/testing/selftests/lib.mk, which states:
>
> "# This mimics the top-level Makefile. We do it explicitly here so that this
>  # Makefile can operate with or without the kbuild infrastructure."
>
> So I don't think it's using any of the definitions from the toplevel
> Makefile.
>
> > If not, maybe the test for CONFIG_CC_IS_CLANG is cleaner?
>
> A quick test indicates that the toplevel CONFIG_* definitions are unavailable
> from the kernel selftests makefiles.

Ok, in that case...
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
Thanks again!

-- 
Thanks,
~Nick Desaulniers