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RE: RFC: Mark a section to be discarded for DSO and executable
- From: "Lu, Hongjiu" <hongjiu dot lu at intel dot com>
- To: <generic-abi at googlegroups dot com>
- Cc: <gcc at gcc dot gnu dot org>, <binutils at sources dot redhat dot com>
- Date: Tue, 9 Jan 2007 14:20:02 -0800
- Subject: RE: RFC: Mark a section to be discarded for DSO and executable
Hi Rod,
It looks like SHF_EXCLUDE is exactly what I am looking for. How useful
is it in your experiences?
Thanks.
H.J.
hongjiu.lu@intel.com
>-----Original Message-----
>From: generic-abi@googlegroups.com
[mailto:generic-abi@googlegroups.com] On
>Behalf Of Rod Evans
>Sent: Tuesday, January 09, 2007 2:15 PM
>To: generic-abi@googlegroups.com
>Cc: gcc@gcc.gnu.org; binutils@sources.redhat.com
>Subject: Re: RFC: Mark a section to be discarded for DSO and executable
>
>
>H. J. Lu wrote:
>> With LTO, an object file may contain sections with IL, which
>> can be discarded when building DSO and executable. Currently we can't
>> mark such sections with gABI. With GNU linker, we can use a
>> linker script to discard such sections. But it will be more generic
>> to make a section to be discarded for DSO and executable in gABI.
>> In that case, we don't need a special linker script to discard
>> such sections. Something like
>>
>> #define SHF_DISCARD 0x800
>>
>> would work.
>
>We invented:
>
>#define SHF_EXCLUDE 0x80000000
>
>a long time ago, which is applied to some sections within relocatable
>objects. Sections tagged with this flag are removed from any final
>object (executables of .so's).
>
>This probably should have followed a SHF_SUNW_ conversion, but this
>was invented long before we thought about OS specific flags.
>
>
>
> SHF_EXCLUDE
>
> This section is excluded from input to the link-edit of an
executable
> or shared object. This flag is ignored if the SHF_ALLOC flag is
also
> set, or if relocations exist against the section.
>
>--
>
>Rod.
>
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