From: Nick Desaulniers <ndesaulniers@google.com>
To: John Moon <quic_johmoo@quicinc.com>
Cc: Masahiro Yamada <masahiroy@kernel.org>,
Nathan Chancellor <nathan@kernel.org>,
Nicolas Schier <nicolas@fjasle.eu>,
linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-arm-msm@vger.kernel.org,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Randy Dunlap <rdunlap@infradead.org>,
Arnd Bergmann <arnd@arndb.de>,
Bjorn Andersson <andersson@kernel.org>,
Todd Kjos <tkjos@google.com>,
Matthias Maennich <maennich@google.com>,
Giuliano Procida <gprocida@google.com>,
kernel-team@android.com, libabigail@sourceware.org,
Jordan Crouse <jorcrous@amazon.com>,
Trilok Soni <quic_tsoni@quicinc.com>,
Satya Durga Srinivasu Prabhala <quic_satyap@quicinc.com>,
Elliot Berman <quic_eberman@quicinc.com>
Subject: Re: [PATCH v2 0/2] Validating UAPI backwards compatibility
Date: Wed, 1 Mar 2023 09:50:30 -0800 [thread overview]
Message-ID: <CAKwvOdmqShYae=DrwP1JZBYXAYZyDB0SaOkVCvCzQC60MaJcpw@mail.gmail.com> (raw)
In-Reply-To: <20230301075402.4578-1-quic_johmoo@quicinc.com>
On Tue, Feb 28, 2023 at 11:54 PM John Moon <quic_johmoo@quicinc.com> wrote:
>
> Currently, the script works with gcc. It generates output like this when
> a backwards-incompatible change is made to a UAPI header:
>
> !!! ABI differences detected in include/uapi/linux/acct.h (compared to
> file at HEAD^1) !!!
>
> [C] 'struct acct' changed:
> type size changed from 512 to 544 (in bits)
> 1 data member insertion:
> '__u32 new_val', at offset 512 (in bits) at acct.h:71:1
>
> 0/1 UAPI header file changes are backwards compatible
> UAPI header ABI check failed
>
> However, we have not had success with clang. It seems clang is more
> aggressive in optimizing dead code away (no matter which options we
> pass). Therefore, no ABI differences are found.
Hi John,
Do you have the list of bugs you've filed upstream against clang wrt.
information missing when using `-fno-eliminate-unused-debug-types`?
https://github.com/llvm/llvm-project/issues is the issue tracker.
Seeing a strong participant in both the Android and LLVM ecosystems
supply scripts that lack clang support...raises eyebrows.
--
Thanks,
~Nick Desaulniers
next prev parent reply other threads:[~2023-03-01 17:50 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-01 7:54 John Moon
2023-03-01 7:54 ` [PATCH v2 1/2] check-uapi: Introduce check-uapi.sh John Moon
2023-03-03 21:09 ` Dodji Seketeli
2023-03-05 4:22 ` Masahiro Yamada
2023-03-05 17:08 ` John Moon
2023-03-01 7:54 ` [PATCH v2 2/2] docs: dev-tools: Add UAPI checker documentation John Moon
2023-03-05 6:20 ` Masahiro Yamada
2023-03-06 16:56 ` John Moon
2023-03-01 17:50 ` Nick Desaulniers [this message]
2023-03-01 18:03 ` [PATCH v2 0/2] Validating UAPI backwards compatibility John Moon
2023-03-01 19:24 ` John Moon
2023-03-01 22:33 ` John Moon
2023-03-01 23:33 ` Nick Desaulniers
2023-03-01 23:35 ` Trilok Soni
2023-03-01 23:52 ` Mark Wielaard
2023-03-01 23:59 ` John Moon
2023-03-10 8:09 ` Christoph Hellwig
2023-03-10 18:20 ` Trilok Soni
2023-03-20 6:26 ` Christoph Hellwig
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