Re: Building libm library

[Harish <harishcse44@gmail.com>]

Got it, Thank you :)

On Fri, Jul 16, 2021 at 9:16 AM Jeff Johnston <jjohnstn@redhat.com> wrote:

>
>
> On Thu, Jul 15, 2021 at 8:54 PM Harish <harishcse44@gmail.com> wrote:
>
>> Ok, thanks for the clarification. One more question. I would like to use
>> math library on a baremetal and want to know if the newlib math library
>> uses system calls?. If yes, is there any other implementation which can be
>> used for baremetals?
>>
>>
> libm does not call system calls.  If you want to implement libc but don't
> want to implement system calls, you can use libnosys which is a stub
> library (e.g. reads fail, writes fail, etc...).
> It is built as part of libgloss and you simply reference it using -lnosys
> in your link.
>
> Regards,
>> Harish
>>
>> On Thu, 15 Jul, 2021, 11:19 pm Jeff Johnston, <jjohnstn@redhat.com>
>> wrote:
>>
>>> Hello Harish,
>>>
>>> It isn't supported.  There are no top Makefile targets for you to do
>>> this and building targets directly from Makefiles in subdirectories often
>>> runs into issues (e.g. missing headers that haven't been copied or
>>> paths/vars set incorrectly since they are supposed to be set by parent
>>> Makefiles).
>>> In addition, the errno/reentrant mechanisms used by libm.a are supplied
>>> by libc.a.
>>>
>>> -- Jeff J.
>>>
>>> On Thu, Jul 15, 2021 at 7:44 AM Harish <harishcse44@gmail.com> wrote:
>>>
>>>> Hi newlib,
>>>>
>>>> I would like to build just libm.a library, is it possible? if yes,
>>>> please
>>>> let me know how can I do it.
>>>>
>>>>
>>>> Thanks,
>>>> Harish C
>>>>
>>>>