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List:       binutils
Subject:    Gold linker: specify alignment of sections
From:       Martin Richtarsky <ml () martinien ! de>
Date:       2013-07-31 17:30:53
Message-ID: 87db65a7811b691ba6a24ff862fb1efe-EhVcX1dJRwNeRwQRAQsKVxcwfgFLV15YQUBGAEFbWkA3VFEKQV51CUtUWF9BSCoDXF1cQlFUUA1c-webmailer2 () server05 ! webmailer ! hosteurope ! de
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 Hi,

 I want to specify alignment for some sections. For ld 2.20.0
 the following approach works:

 - create a linker script containing only the sections that
   should be aligned, e.g.:

   SECTIONS
   {
       .data ALIGN(0x40): { *(.data) }

       .text ALIGN(0x40): { *(.text) }

       .plt ALIGN(0x10): { *(.plt) }
   }

 then link with:

 -rpath-link=/path/to/LinkerScript.ld /path/to/LinkerScript.ld

 E.g. include the script in rpath-link and also pass it as one of
 the object files. This is an implicit linker script as described here:

 http://sourceware.org/binutils/docs-2.23.1/ld/Implicit-Linker-Scripts.html#Implicit-Linker-Scripts


 Now, when linking in the same way using gold 2.23.1, the
 script is rejected with this error:

 " LinkerScript.ld: SECTIONS seen after other input files;
   try -T/--script"

 So gold wants me to specify a complete linker script, however I
 only want to change a couple attributes. Is this possible?

 I have already tried:

 - Passing the script with the -T option. This produces a broken
   executable that fails to start. As I understand this is because
   -T only accepts complete linker scripts, while the above is
   just an implicit linker script.
 - In the same vein, when passing the script with the -T option to
   ld 2.20.0 it fails to link since some sections are unspecified.
   It is not a "complete" linker script for my use case.
 - So I have tried obtaining a complete linker script. "ld --verbose"
   will print the default linker script. I had to remove a couple
   of symbols that were not understood by gold, afterwards the 
 executable
   produced with the "-T/path/to/LinkerScript.ld" option didn't work 
 anymore.
 - Unfortunately gold has no option to show its default linker script
   (it doesn't use any). The man pages do not specify how to change
   alignment for the case above with a parameter.

 Any help would be greatly appreciated!

 Best regards,
 Martin Richtarsky

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