Properly building newlib to install spec files

[Jozef Lawrynowicz]

On Wed, 6 Nov 2019 11:07:53 +0000
Jozef Lawrynowicz <jozef.l@mittosystems.com> wrote:
.. snip ..
> 
> As you discovered, nosys still exists but it is enabled by using the GCC -msim
> option. The real use case for stubbing out system calls is when running programs
> in the simulator.

Whoops, that should actually say that nosys (libnosys.a) is used when running on
real hardware (the default), whilst a separate simulator library (libsim.a) is
used when -msim is passed to GCC.

Jozef

> 
> In the default configuration which assumes the program will run on real
> hardware, most system calls (except write() and unlink()) are stubbed out
> and just loop forever. So there will be very little (if any) code size
> bloat from using the default configuration over -msim.
> 
> When TI CIO functionality is added to the other syscalls, there could be a
> use case to provide an option (--specs or otherwise) which enables them to be
> stubbed out again.
> 
> Hope this helps,
> Jozef
> 
> > 
> > Again, thank you.
> > 
> > Cheers,
> > Orlando.
> > 
> > [1] ftp://sourceware.org/pub/newlib/index.html
> >   
>