Using linker script instead of library in Gold

Using linker script instead of library in Gold

[Aleksandar Simeonov]

Hi Ian,
I have one short question today. Situation is as follow: instead of
having lib.so as shared library, on our Linux distribution we have ld
linker script:
/* GNU ld script
   Use the shared library, but some functions are only in
   the static library, so try that secondarily.  */
OUTPUT_FORMAT(elf32-tradlittlemips)
GROUP ( /lib/libc.so.6 /usr/lib/libc_nonshared.a  AS_NEEDED (
/lib/ld.so.1 ) )

Is Gold capable of using it (for ld is enough to put -lc in command
line) and if yes, what command option should be used?

Thanks in advance for your answer.

Aleksandar

Re: Using linker script instead of library in Gold

[Ian Lance Taylor]

Aleksandar Simeonov <Aleksandar.Simeonov@RT-RK.com> writes:

> I have one short question today. Situation is as follow: instead of
> having lib.so as shared library, on our Linux distribution we have ld
> linker script:
> /* GNU ld script
>    Use the shared library, but some functions are only in
>    the static library, so try that secondarily.  */
> OUTPUT_FORMAT(elf32-tradlittlemips)
> GROUP ( /lib/libc.so.6 /usr/lib/libc_nonshared.a  AS_NEEDED (
> /lib/ld.so.1 ) )
>
> Is Gold capable of using it (for ld is enough to put -lc in command
> line) and if yes, what command option should be used?

This is normal on any glibc-based system.  gold supports this without
requiring any special options.

Ian

Re: Using linker script instead of library in Gold

[Aleksandar Simeonov]

Yes, but still when I do linking I got error like:
../../mips-linux-gnu-ld.gold: Attempt to open /usr/lib/libc.so succeeded
../../mips-linux-gnu-ld.gold: warning: skipping incompatible
/usr/lib/libc.so while searching for c
../../mips-linux-gnu-ld.gold: error: cannot find -lc

Maybe I overlooked something?

Aleksandar

On 13/07/2011 17:46, Ian Lance Taylor wrote:
> Aleksandar Simeonov <Aleksandar.Simeonov@RT-RK.com> writes:
> 
>> I have one short question today. Situation is as follow: instead of
>> having lib.so as shared library, on our Linux distribution we have ld
>> linker script:
>> /* GNU ld script
>>    Use the shared library, but some functions are only in
>>    the static library, so try that secondarily.  */
>> OUTPUT_FORMAT(elf32-tradlittlemips)
>> GROUP ( /lib/libc.so.6 /usr/lib/libc_nonshared.a  AS_NEEDED (
>> /lib/ld.so.1 ) )
>>
>> Is Gold capable of using it (for ld is enough to put -lc in command
>> line) and if yes, what command option should be used?
> 
> This is normal on any glibc-based system.  gold supports this without
> requiring any special options.
> 
> Ian
> 

Re: Using linker script instead of library in Gold

[Ian Lance Taylor]

Aleksandar Simeonov <Aleksandar.Simeonov@RT-RK.com> writes:

> Yes, but still when I do linking I got error like:
> ../../mips-linux-gnu-ld.gold: Attempt to open /usr/lib/libc.so succeeded
> ../../mips-linux-gnu-ld.gold: warning: skipping incompatible
> /usr/lib/libc.so while searching for c
> ../../mips-linux-gnu-ld.gold: error: cannot find -lc
>
> Maybe I overlooked something?

It means that the OUTPUT_FORMAT string in your libc.so,
elf32-tradlittlemips, was not recognized or did not match the target
recognized for the .o files.  What string are you passing to the
Target_selector constructor?

Ian


> On 13/07/2011 17:46, Ian Lance Taylor wrote:
>> Aleksandar Simeonov <Aleksandar.Simeonov@RT-RK.com> writes:
>> 
>>> I have one short question today. Situation is as follow: instead of
>>> having lib.so as shared library, on our Linux distribution we have ld
>>> linker script:
>>> /* GNU ld script
>>>    Use the shared library, but some functions are only in
>>>    the static library, so try that secondarily.  */
>>> OUTPUT_FORMAT(elf32-tradlittlemips)
>>> GROUP ( /lib/libc.so.6 /usr/lib/libc_nonshared.a  AS_NEEDED (
>>> /lib/ld.so.1 ) )
>>>
>>> Is Gold capable of using it (for ld is enough to put -lc in command
>>> line) and if yes, what command option should be used?
>> 
>> This is normal on any glibc-based system.  gold supports this without
>> requiring any special options.
>> 
>> Ian
>> 

Re: Using linker script instead of library in Gold

[Aleksandar Simeonov]

Thanks,
You were right. Problem was that I used elf32-mips instead of
elf32-tradlittlemips as name. I fixed that, and now that part work
(still there are some other issues :-)).

Aleksandar

On 14/07/2011 19:15, Ian Lance Taylor wrote:
> Aleksandar Simeonov <Aleksandar.Simeonov@RT-RK.com> writes:
> 
>> Yes, but still when I do linking I got error like:
>> ../../mips-linux-gnu-ld.gold: Attempt to open /usr/lib/libc.so succeeded
>> ../../mips-linux-gnu-ld.gold: warning: skipping incompatible
>> /usr/lib/libc.so while searching for c
>> ../../mips-linux-gnu-ld.gold: error: cannot find -lc
>>
>> Maybe I overlooked something?
> 
> It means that the OUTPUT_FORMAT string in your libc.so,
> elf32-tradlittlemips, was not recognized or did not match the target
> recognized for the .o files.  What string are you passing to the
> Target_selector constructor?
> 
> Ian
> 
> 
>> On 13/07/2011 17:46, Ian Lance Taylor wrote:
>>> Aleksandar Simeonov <Aleksandar.Simeonov@RT-RK.com> writes:
>>>
>>>> I have one short question today. Situation is as follow: instead of
>>>> having lib.so as shared library, on our Linux distribution we have ld
>>>> linker script:
>>>> /* GNU ld script
>>>>    Use the shared library, but some functions are only in
>>>>    the static library, so try that secondarily.  */
>>>> OUTPUT_FORMAT(elf32-tradlittlemips)
>>>> GROUP ( /lib/libc.so.6 /usr/lib/libc_nonshared.a  AS_NEEDED (
>>>> /lib/ld.so.1 ) )
>>>>
>>>> Is Gold capable of using it (for ld is enough to put -lc in command
>>>> line) and if yes, what command option should be used?
>>>
>>> This is normal on any glibc-based system.  gold supports this without
>>> requiring any special options.
>>>
>>> Ian
>>>
>