Re: cygwin Cross-GCC to MIPS

[Dave Nadler <Dave dot Nadler at nadler dot com>]

Thanks Yann - With a bit of guidance, maybe I can help
get this working on cygwin... Not my full-time job either !

Can you give me skeletal instructions of how to go about
this, given I am a very experienced developer but not at
all fluent with GCC nor the tools to build it ? I'm happy to
give it a shot...

Thanks !
Best Regards, Dave

PS: Perhaps a dumb question (and I'm also using QEMU at
this instant), but have you considered Xen instead, which
should give closer to full-speed - not just for Windows,
but any other x86 VMs you need to use for testing ?


At 06:15 PM 12/3/2008, Yann E. MORIN wrote:
> Dave,
> All,
>
> On Wednesday 03 December 2008 00:27:16 Dave Nadler wrote:
> > We wait to hear how it worked Yann !
> > And also a list of what cygwin pieces you needed to install... ;-)
> > Thanks for your efforts,
> > Best Regards, Dave
> >
> > PS: Just to be really clear about what I hope to get:
> > - build and host environment is cygwin
> > - target environment is bare-metal small MIPS machine
> > - target libraries are needed to support any components
> >    expected by the compiler, including basic memory allocation
> >    and library routines needed to support C++...
>
> Now for me to be very clear:
>
> I am not paid for my work on crosstool-NG.
>
> I am working on crosstool-NG on my spare time, because I have a need for it.
> It takes me a lot of time, more than 3 hours a day after I come back from
> work, plus more than 6 hours saturdays and sundays. That is above 30 hours a
> week (*). This for about the last two years.
>
> I exclusively have Linux machines at home, I don't have any Windows-based real
> machine at hand, and thus have to rely on emulation (qemu) to run such a
> machine. Cygwin is but a layer on top of Windows to emulate POSIX, and thus is
> a real pain to work with... The last measurements I have give a ratio of 180
> (yes, one hundred and eighty) when running crosstool-NG under this emulation,
> compared to running crosstool-NG on the real Linux system (**).
>
> Porting to Cygwin is a real pain, I can not afford working on it any longer.
> I am not ready to do someone else's job.
>
> Now, should soneone be really interested, I am ready to look at patches.
> There shouldn't be a lot of work, crosstool-NG by itself is only shell
> scripts and Makefiles, writen with portability in mind. The only problems
> may arise with the components, which might need Cygwin-related patches or
> build instructions. In my kindness, attached is an as-yet untested patch
> to try and fix MPFR build. That won't go in the repository, and I'll revert
> my changes, as I can't test it. Bite your teeth on it, who ever wants to...
>
> BTW, I also have a girlfriend, a house that needs working on, friends...
> Real life, I call it, and that's what matters most for me.
>
> Regards,
> Yann E. MORIN.
>
> (*) building a single complete toolchain ranges from about 25 minutes, up to
>     35 minutes, mostly due to using glibc vs. uClibc. Bare metal is a special
>     case that takes approx. 5 minutes, but those are not too common. So 
> testing
>     a change in crosstool-NG can take long...
>
> (**) timings are done on a Core 2 Quad @ 2830MHz, with 4GiB RAM, an ageing 
> SATA
>      80GiB disk. The emulated system is a WinXP with 768MiB RAM, an 8GiB 
> virtual
>      disk in a (contiguous?) file, with Cygwin 1.5.25-25, running on the same
>      real machine.
>      Time to extract GMP + MPFR + binutils + gcc + gdb:
>       - real system:       ~54 seconds
>       - emulated system: ~3600 seconds (more than 59 minutes in fact)
>       - ratio: ~66
>      Time to build GMP-4.2.4:
>       - real system:       ~40 seconds
>       - emulated system: ~7200 seconds (2 hours and few secs in fact)
>       - ratio: ~180
>      So we are, more than probably, bound to the virtual CPU more than we are
>      to the virtual disk.
>
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Dave Nadler, USA East Coast voice (978) 263-0097,  drn@nadler.com 



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