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Message-ID: <20150428185852.GP17573@brightrain.aerifal.cx>
Date: Tue, 28 Apr 2015 14:58:52 -0400
From: Rich Felker <dalias@...c.org>
To: musl@...ts.openwall.com
Subject: Re: [PATCH] force LTO to be disabled when compiling dlstart.lo
On Tue, Apr 28, 2015 at 09:50:59PM +0300, Alexander Monakov wrote:
> > If the person on #gcc with ld -r was using gcc asm statements as well, that
> > would explain their problem too.
>
> Let me add that there's another class of problems with toplevel asms and LTO:
> as a result of LTO partitioning, toplevel asm may be moved into a different
> partition from the symbol it's referencing, breaking the build (when toplevel
> asm is referencing a static function). GCC bug report for that issue is here:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57703
I have an interesting solution to this problem: get rid of the
top-level asm and instead put it inside the function with 2 additional
lines:
- At the top, "jmp 9f" or equivalent.
- At the bottom, "9:".
Now the asm can't be separated from the function because it's part of
it. Would that work?
Rich
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