[cfe-dev] DWARFv5 by default in clang?

[David Blaikie via cfe-dev]

On Mon, Jan 24, 2022 at 12:41 PM Stephen Hines <srhines at google.com> wrote:

> Heh, I actually just moved the Android platform build to DWARFv5 last week
> (https://android-review.googlesource.com/c/platform/build/soong/+/1954424).
> We had previously tried this but had to revert it due to some issues with
> libabigail. I'll move upstream LLVM to default to DWARFv5 for Android more
> generally soon. Thanks for reminding me to do so.
>

Awesome :)


>
> Thanks,
> Steve
>
> On Sun, Jan 23, 2022 at 8:52 PM David Blaikie <dblaikie at gmail.com> wrote:
>
>> Well, made the switch to DWARFv5 by default
>> in d3b26dea16108c427b19b5480c9edc76edf8f5b4 and included a change to keep
>> DWARFv4 as the default for linux-androideabi (at least I think I made that
>> change in the right place). If it needs to be more generic (apply to
>> non-linux toolchains, but I don't think so?) or can be removed because
>> Android's OK with DWARFv5 - should be simple to make that change.
>>
>> On Sun, Jan 23, 2022 at 8:08 PM David Blaikie <dblaikie at gmail.com> wrote:
>>
>>> Hey Stephen,
>>>
>>> I see you added a test to ensure Android uses DWARFv4 here:
>>> https://reviews.llvm.org/D60238
>>>
>>> Is that still the case? I can figure out how to ensure that's the case
>>> as we transition the default to DWARFv5 for platforms that haven't opted
>>> out.
>>>
>>> On Tue, Nov 30, 2021 at 9:28 AM Khem Raj <raj.khem at gmail.com> wrote:
>>>
>>>> On Tue, Nov 30, 2021 at 9:10 AM via cfe-dev <cfe-dev at lists.llvm.org>
>>>> wrote:
>>>> >
>>>> > > Generic_GCC has many (indirect) derived classes
>>>> > > (FreeBSD/OpenBSD/Solaris) which override the base
>>>> > > GetDefaultDwarfVersion().
>>>> > > The Generic_GCC change will affect
>>>> > > Haiku/Hurd/Linux/NetBSD/PS4CPU/etc. I have CC'd these folks: if
>>>> > > your platform is not ready for DWARF v5, you can override
>>>> > > GetDefaultDwarfVersion() in your toolchain.
>>>>
>>>> We have been using v5 in yocto with clang13 onwards as well [1] and
>>>> have not seen any blockers.
>>>>
>>>> [1]
>>>> https://github.com/kraj/meta-clang/blob/master/recipes-devtools/clang/clang/0027-clang-Switch-defaults-to-dwarf-5-debug-info-on-Linux.patch
>>>>
>>>> >
>>>> > PS4 updated to set v4 explicitly as of
>>>> >
>>>> https://github.com/llvm/llvm-project/commit/b8e03be88dc87303f7401ea7b9906947ac67a6db
>>>> > --paulr
>>>> > _______________________________________________
>>>> > cfe-dev mailing list
>>>> > cfe-dev at lists.llvm.org
>>>> > https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev
>>>>
>>>
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