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From: "H.J. Lu" <hjl.tools@gmail.com>
Date: Wed, 30 Sep 2020 07:03:46 -0700
Message-ID: <CAMe9rOo-Nz6vt3ue2z0+iQNXCx6AkqyjSzN=ZghWCFdsTpPpEw@mail.gmail.com>
Subject: Re: [PATCH] elf: Also check linked-to section for SHT_NOTE section
To: Nick Clifton <nickc@redhat.com>
Cc: Binutils <binutils@sourceware.org>, Fangrui Song <i@maskray.me>
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On Wed, Sep 30, 2020 at 7:01 AM Nick Clifton <nickc@redhat.com> wrote:
>
> Hi H.J.
>
>   Thanks for taking an interest in this.
>
> > Please try this patch.
>   It did not appear to make a difference. :-(
>
>   I am using an extended test case (attached) but the results are the
>   same as before:
>
>   % as eliminate.s -o eliminate.o
>   % ld -e 0 --gc-sections --print-gc-sections eliminate.o
>   ld: removing unused section '.group' in file 'eliminate.o'
>   ld: removing unused section '.group' in file 'eliminate.o'
>   ld: removing unused section '.text' in file 'eliminate.o'
>   ld: removing unused section '.unused1' in file 'eliminate.o'
>   ld: removing unused section '.unused2[unused_group]' in file 'eliminate.o'
>   ld: removing unused section '.unused3[unused_group2]' in file 'eliminate.o'
>   ld: removing unused section '.gnu.note2[unused_group]' in file 'eliminate.o'
>   ld: removing unused section '.gnu.note3[unused_group2]' in file 'eliminate.o'
>   ld: a.out: sh_link of section `.gnu.note1' points to discarded section `.unused1' of `eliminate.o'
>   ld: final link failed: bad value
>
> Cheers
>   Nick

Works for me:

[hjl@gnu-cfl-2 ld]$ gcc -c eliminate.s
[hjl@gnu-cfl-2 ld]$ ./ld-new -e 0 --gc-sections --print-gc-sections eliminate.o
./ld-new: removing unused section '.group' in file 'eliminate.o'
./ld-new: removing unused section '.group' in file 'eliminate.o'
./ld-new: removing unused section '.text' in file 'eliminate.o'
./ld-new: removing unused section '.unused1' in file 'eliminate.o'
./ld-new: removing unused section '.unused2[unused_group]' in file 'eliminate.o'
./ld-new: removing unused section '.unused3[unused_group2]' in file
'eliminate.o'
./ld-new: removing unused section '.gnu.note1' in file 'eliminate.o'
./ld-new: removing unused section '.gnu.note2[unused_group]' in file
'eliminate.o'
./ld-new: removing unused section '.gnu.note3[unused_group2]' in file
'eliminate.o'
[hjl@gnu-cfl-2 ld]$


-- 
H.J.