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Date:	Tue, 03 Dec 2013 15:05:11 +0100
From:	Juan Manuel Guerrero <juan DOT guerrero AT gmx DOT de>
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To:	djgpp-workers AT delorie DOT com
Subject:	Re: Binutils and LTO in GCC
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Am 23.11.2013 15:26, schrieb Andris Pavenis:
> On 11/23/2013 03:49 PM, Juan Manuel Guerrero wrote:
>> Am 23.11.2013 09:25, schrieb Andris Pavenis:
>>> We should discard .gnu.lto_* sections in linker similarly as it
>>> is done for Linux
>>>
>>> /DISCARD/: { *(gnu.lto_*) }
>>>
>>> Now that at least for current development version of GCC (4.9)
>>> one can with some additional modifications enable LTO it would
>>> be nice to have support for it also in binutils
>>>
>>> The related source file is ld/scripttempl/i386go32.sc
>>>
>>> Andris
>>>
>>
>> Do you need a new release of bnu2232 with the linker script that has the
>> DISCARD line added?
>>
>>
> I guess, it is not urgent. We do not yet have released version of GCC
> for DJGPP which supports LTO. It is not critical problem like broken
> debugging info support, so it can wait. gcc-4.8.3 or gcc-4.9.0 release
> is not expected very soon also.
>
> I could also build binutils myself if needed (although I would perhaps
> do it under Linux using cross-compiling instead of native build for DJGPP)
>
> Also if one likes to check out, then build of snapshot with LTO support
> enabled can be found at:
>
> http://ap1.pp.fi/djgpp/gcc/test/4.9.0-20131121/
>
> I have not done much testing with it. Build bash-2.0.5b using it and
> specified CFLAGS="-O2 -g -flto" for building. All seemed to work.
>
> Andris
>
>
>
>

In a couple of days I would like to upload the port of binutils 2.24.
Apart from the usual changes to i386go32.sc that are not showed in the
patch below, do you need some other LTO specific changes that must go
into the port?  I will look at the sources anyway but you may be more
familiar with the LTO stuff.

Regards,
Juan M. Guerrero



diff -aprNU10 binutils-2.24.orig/ld/scripttempl/i386go32.sc binutils-2.24/ld/scripttempl/i386go32.sc
--- binutils-2.24.orig/ld/scripttempl/i386go32.sc    2013-11-04 15:33:38 +0100
+++ binutils-2.24/ld/scripttempl/i386go32.sc    2013-12-03 14:33:56 +0100
@@ -63,12 +63,13 @@ SECTIONS
      ${RELOCATING+ . = ALIGN(${SEGMENT_SIZE});}
    }
    /* Stabs debugging sections.  */
    .stab 0 : { *(.stab) }
    .stabstr 0 : { *(.stabstr) }
  EOF

  . $srcdir/scripttempl/DWARF.sc

  cat <<EOF
+  /DISCARD/: { *(gnu.lto_*) }
  }
  EOF

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