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From: Andreas Schwab <schwab@suse.de>
To: Michael Matz <matz@suse.de>
Cc: gcc-patches@gcc.gnu.org,  Jakub Jelinek <jakub@redhat.com>,  Richard
 Biener <richard.guenther@gmail.com>,  Jan Hubicka <hubicka@ucw.cz>
Subject: Re: [PATCH] lto: pass through -funwind-tables and
 -fasynchronous-unwind-tables
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X-Yow: Actually, what I'd like is a little toy spaceship!!
Date: Wed, 18 Jan 2023 15:14:01 +0100
In-Reply-To: <alpine.LSU.2.20.2301181328520.30340@wotan.suse.de> (Michael
	Matz's message of "Wed, 18 Jan 2023 14:03:42 +0000 (UTC)")
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On Jan 18 2023, Michael Matz wrote:

> So, it's quite clear that the option merging algorithm related to all this 
> is somewhat broken, the global (or per function, or whatever) 
> -funwind-tables option from hello.o doesn't make it correctly into the 
> output (when -g is there).  Adding -fexception makes it work because then 
> the functions will have personalities and on LTO-read-in _that_ will 
> implicitely enable funwind-tables again (which should have been enabled 
> already by the option-read-in).

My guess is that flag_unwind_tables is not yet set when .cfi_sections is
emitted (which is done by dwarf2out_assembly_start before compile starts).

-- 
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."