[arm-embedded] [PATCH, GCC/LTO, ping] Fix PR69866: LTO with def for weak alias in regular object file

[Thomas Preudhomme <thomas.preudhomme@foss.arm.com>]

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Hi,

We have decided to apply the referenced fix (r249352) to the 
ARM/embedded-6-branch along with its initial commit (r249224) to fix an ICE with 
LTO and aliases.

Fix PR69866

     2017-06-20  Thomas Preud'homme  <thomas.preudhomme@arm.com>

         Backport from mainline
         2017-06-15  Jan Hubicka  <hubicka@ucw.cz>
                     Thomas Preud'homme  <thomas.preudhomme@arm.com>

         gcc/
         PR lto/69866
         * lto-symtab.c (lto_symtab_merge_symbols): Drop useless definitions
         that resolved externally.
         2017-06-15  Thomas Preud'homme  <thomas.preudhomme@arm.com>

         gcc/testsuite/
         PR lto/69866
         * gcc.dg/lto/pr69866_0.c: New test.
         * gcc.dg/lto/pr69866_1.c: Likewise.

         Backport from mainline
         2017-06-18  Jan Hubicka  <hubicka@ucw.cz>

         gcc/testsuite/
         * gcc.dg/lto/pr69866_0.c: This test needs alias.

Best regards,

Thomas

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From: Jan Hubicka <hubicka@ucw.cz>
To: Dominique d'Humi??res <dominiq@lps.ens.fr>
Cc: hubicka Jan <hubicka@ucw.cz>, gcc-patches <gcc-patches@gcc.gnu.org>
Subject: Re: [PATCH, GCC/LTO, ping] Fix PR69866: LTO with def for weak alias in regular object file
Date: Sun, 18 Jun 2017 21:56:01 +0200
Message-ID: <20170618195601.GG30427@atrey.karlin.mff.cuni.cz>

> The new test fails on darwin with the usual
> 
> FAIL: gcc.dg/lto/pr69866 c_lto_pr69866_0.o-c_lto_pr69866_1.o link, -O0 -flto -flto-partition=none
> 
> IMO it requires a
> 
> /* { dg-require-alias "" } */

Yep,I will add it shortly.

Honza
> 
> directive.
> 
> TIA
> 
> Dominique