2014-05-14 23:54 GMT+08:00 Sheheryar Zahoor Qazi
<sheheryar.zahoor.qazi@xxxxxxxxx>:
> Hi jasonwucj,
> Thanky for the reply!
> This might seem trivial, but config.gcc is supposed to be the target
> specific file. But when I build gcc for my target, config.gcc is not
> invoked. Do you have any idea why that would be happening?
> Sheheryar
>
Hi, Sheheryar,
The config.gcc is included in the configure process.
Check configure.ac, you can see following code fragment:
# Collect target-machine-specific information.
. ${srcdir}/config.gcc
So if the process does not work well as you expect, I think
there must be something wrong, either syntax error or logic error,
in your implementation in the config.gcc.
Best regards,
jasonwucj
> On Wed, May 14, 2014 at 5:21 AM, Chung-Ju Wu <jasonwucj@xxxxxxxxx> wrote:
>> 2014-05-13 22:05 GMT+08:00 Sheheryar Zahoor Qazi
>> <sheheryar.zahoor.qazi@xxxxxxxxx>:
>>> Hi,
>>> I am working on an 18-bit opensource soft-core processor at my
>>> university. My task is to emulate floating point operation since there
>>> is no hardware unit for float operations. I have the cross compiler
>>> and binutils for my target. But upon calling atest program, it gives
>>> the following error:
>>>
>>> : In function `test':
>>> (.text+0x0): undefined reference to `__floatsisf'
>>> In function `test':
>>> : In function `test':
>>> (.text+0x2c): undefined reference to `__mulsf3'
>>> : In function `test':
>>> (.text+0x2e): undefined reference to `__fixsfsi'
>>>
>>> I realize there needs a machine dependent sfp-machine.h file and I
>>> have it for my architecture modified. Can anyone explain me the
>>> changes required to be make in the config.gcc file to link my target
>>> to soft-fp libraries? and do I need any more changes in gcc build?
>>>
>>> Thanks
>>>
>>> Sheheryar
>>
>> Hi, Sheheryar,
>>
>> 1. Add sfp-machine.h
>> 2. In the libgcc/config.host, add soft-fp makefile fragment like this:
>> tmake_file="${tmake_file} t-softfp-sfdf t-softfp
>> 3. If required, add t-softfp-excl or t-softfp-tf in the tmake_file as well.
>> (See t-softfp for details.)
>>
>> With the changes above, the necessary soft-fp modules will be compiled
>> into your libgcc.a.
>>
>>
>> Best regards,
>> jasonwucj
