Re: Big Endian support as multi-ABI (was Re: [PATCH v4 02/15] ARC: ABI Implementation)

2020-03-31 Thread Vineet Gupta
On 3/31/20 2:27 PM, Joseph Myers wrote: > On Tue, 31 Mar 2020, Vineet Gupta via Libc-alpha wrote: > >> But a BE system can't possibly be mixed with a LE, its not really a >> multilib case > > Indeed. The Linux kernel does not support running BE processes on an LE > kernel or vice versa, even wh

Re: Big Endian support as multi-ABI (was Re: [PATCH v4 02/15] ARC: ABI Implementation)

2020-03-31 Thread Joseph Myers
On Tue, 31 Mar 2020, Vineet Gupta via Libc-alpha wrote: > But a BE system can't possibly be mixed with a LE, its not really a > multilib case Indeed. The Linux kernel does not support running BE processes on an LE kernel or vice versa, even when the underlying architecture does support runtim

Big Endian support as multi-ABI (was Re: [PATCH v4 02/15] ARC: ABI Implementation)

2020-03-31 Thread Vineet Gupta
On 3/26/20 11:48 AM, Joseph Myers wrote: > Yes, if you want to support BE then it should be documented as supported, > it should have its own dynamic linker name (with consequent GCC change > required to use that name) and it should have its own build in > build-many-glibcs.py. So I booted the

Re: [PATCH v4 02/15] ARC: ABI Implementation

2020-03-27 Thread Vineet Gupta
On 3/27/20 4:35 PM, Joseph Myers wrote: > On Fri, 27 Mar 2020, Vineet Gupta via Libc-alpha wrote: > >> I added bits in sysdeps/arc/configure.ac and corresponding conditional in >> shlib-version. But I have to ask (embarrassingly). how to I regenerate >> sysdeps/arc/configure. I tried all possibe

Re: [PATCH v4 02/15] ARC: ABI Implementation

2020-03-27 Thread Joseph Myers
On Fri, 27 Mar 2020, Vineet Gupta via Libc-alpha wrote: > I added bits in sysdeps/arc/configure.ac and corresponding conditional in > shlib-version. But I have to ask (embarrassingly). how to I regenerate > sysdeps/arc/configure. I tried all possibe autoconf cmds with toggles (both > at > top an

Re: [PATCH v4 02/15] ARC: ABI Implementation

2020-03-27 Thread Vineet Gupta
On 3/26/20 11:48 AM, Joseph Myers wrote: > On Wed, 25 Mar 2020, Vineet Gupta via Libc-alpha wrote: > >> Hardware-wise, ARC can be configured to be LE or BE and software supports >> that >> (cfr Linux or uClibc). The initial glibc port was only aiming LE but we >> ended up >> with BE as well due

Re: [PATCH v4 02/15] ARC: ABI Implementation

2020-03-26 Thread Vineet Gupta
On 3/26/20 11:48 AM, Joseph Myers wrote: > On Wed, 25 Mar 2020, Vineet Gupta via Libc-alpha wrote: > >> Hardware-wise, ARC can be configured to be LE or BE and software supports >> that >> (cfr Linux or uClibc). The initial glibc port was only aiming LE but we >> ended up >> with BE as well due

Re: [PATCH v4 02/15] ARC: ABI Implementation

2020-03-26 Thread Joseph Myers
On Wed, 25 Mar 2020, Vineet Gupta via Libc-alpha wrote: > Hardware-wise, ARC can be configured to be LE or BE and software supports that > (cfr Linux or uClibc). The initial glibc port was only aiming LE but we ended > up > with BE as well due to a customer engagement. And given much of ARC port

Re: [PATCH v4 02/15] ARC: ABI Implementation

2020-03-25 Thread Vineet Gupta
On 3/25/20 6:52 PM, Joseph Myers wrote: > On Thu, 12 Mar 2020, Vineet Gupta via Libc-alpha wrote: >> +/* ARC has selectable endianness. */ >> +#ifdef __BIG_ENDIAN__ >> +# define __BYTE_ORDER __BIG_ENDIAN >> +#else >> +# define __BYTE_ORDER __LITTLE_ENDIAN >> +#endif > > Elsewhere you say the port

Re: [PATCH v4 02/15] ARC: ABI Implementation

2020-03-25 Thread Joseph Myers
On Thu, 12 Mar 2020, Vineet Gupta via Libc-alpha wrote: > diff --git a/sysdeps/arc/bits/endianness.h b/sysdeps/arc/bits/endianness.h > new file mode 100644 > index ..8f17ca84b485 > --- /dev/null > +++ b/sysdeps/arc/bits/endianness.h > @@ -0,0 +1,15 @@ > +#ifndef _BITS_ENDIANNESS_H > +#