2014-05-20 19:14 GMT+08:00 Sheheryar Zahoor Qazi
<sheheryar.zahoor.qazi@xxxxxxxxx>:
> Hi Jason!
>
> >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
>
> I think you mean config.host and not config.gcc? because i can find the
> following code fragment:
> # Collect target-machine-specific information.
> . ${srcdir}/config.host
>
> FYI, I am using gcc 4.4.5!
>
> Additionally, Can you specify where should i specify sfp-machine.h?
> should it go in /gcc-4.4.5/gcc/config/<target>/ or should it be in
> /gcc-4.4.5/libgcc/config
> Or do i need to make a <target> folder in /gcc-4.4.5/libgcc/config and
> specify sfp-machine.h there?
>
Hi, Sheheryar,
Sorry for the late reply. I was busy on the company's project and schedule.
Since you are using gcc-4.4.5, which is old and its branch is closed,
the soft-fp stuff is located under gcc/config/{target}/ directory.
You need to modify gcc/config.gcc to include t-softfp makefile
fragment for you target.
You can also refer to arm/i386/ia64/rs6000 implementation for more details. :)
Best regards,
jasonwucj
>
> On Tue, May 20, 2014 at 7:31 AM, Chung-Ju Wu <jasonwucj@xxxxxxxxx> wrote:
>>
>> 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
>
>
