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From: Andreas Schwab <schwab@suse.de>
To: Richard Biener <richard.guenther@gmail.com>
Cc: gcc-patches@gcc.gnu.org
Subject: Re: [PATCH] lto: pass through -funwind-tables and
 -fasynchronous-unwind-tables
References: <mvmlem0ywoy.fsf@suse.de>
	<CAFiYyc2GmxHYHM1Wt2HwyGM9zJvspfYiSwOrBWD6odfoAhVmwA@mail.gmail.com>
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Date: Wed, 25 Jan 2023 14:50:45 +0100
In-Reply-To: <CAFiYyc2GmxHYHM1Wt2HwyGM9zJvspfYiSwOrBWD6odfoAhVmwA@mail.gmail.com>
	(Richard Biener's message of "Wed, 25 Jan 2023 14:16:26 +0100")
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On Jan 25 2023, Richard Biener wrote:

> where we'd prefer -funwind-tables over -fno-unwind-tables when the
> options do not match
> across TUs.  Note that you likely want to add
> -f[asynchronous-]unwind-tables handling
> in lto-options.cc:lto_write_options as well so the default is streamed
> as explicit option.
> Otherwise a single TU with -fno-unwind-tables on x86-64 would cause
> the whole LTO
> compilation to be built without.

I don't think we actually need to handle -fasynchronous-unwind-tables
here, since that implies -funwind-tables, and only the latter is
relevant for dwarf2out_do_eh_frame.

-- 
Andreas Schwab, SUSE Labs, schwab@suse.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."