Link with mixed IR/non-IR objects

[H.J. Lu]

On Wed, Apr 27, 2011 at 7:29 AM, Markus Trippelsdorf
<markus@trippelsdorf.de> wrote:
> On 2011.04.27 at 06:49 -0700, H.J. wrote:
>> Here is a proposal to link with mixed IR/non-IR objects:
>>
>> * 2 kinds of object files
>>   o non-IR object file has
>>     * non-IR sections
>>   o IR object file has
>>     * IR sections
>>     * non-IR sections
>>     * The output of "ld -r" with mixed IR/non-IR objects should work
>> with:
>>         o Compilers/linkers with IR support.
>>       o Compilers/linkers without IR support.
>> * Add the mixed object file which has
>>   o IR sections
>>   o non-IR sections:
>>     * Object codes from IR sections.
>>     * Object codes from non-IR object files.
>>   o Object-only section:
>>     * With section name ".gnu_object_only" and SHT_GNU_OBJECT_ONLY
>> type
>>     on ELF:
>>     #define SHT_GNU_OBJECT_ONLY 0x6ffffff8    /* Object only */
>
> I'm wondering if it wouldn't be better to simply use:
> SHT_GNU_IRBITS (= 0x6fff4952)
> that has already been proposed here:
> http://gcc.gnu.org/wiki/whopr/driver ?
>
> »Thus, we plan to mark the IR sections with a special section type,
> SHT_GNU_IRBITS (= 0x6fff4952).«
>

They are different. SHT_GNU_OBJECT_ONLY section doesn't contain
any IR. It encapsulates a relocatable object file without any IR bits.


-- 
H.J.