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From: Sergei Gavrikov <sergei.gavrikov@gmail.com>
To: John Dallaway <john@dallaway.org.uk>
Cc: Ilija Kocho <ilijak@siva.com.mk>,
	    eCos developers <ecos-devel@ecos.sourceware.org>
Subject: Re: Gnutools: consideration for upgrade to GCC 4.6
Date: Sat, 14 Jan 2012 16:02:00 -0000	[thread overview]
Message-ID: <alpine.DEB.2.00.1201141854480.2289@vostro> (raw)
In-Reply-To: <4F11574D.9070002@dallaway.org.uk>

Hi all,

John Dallaway wrote:

> Hi Ilija and all
> 
> Ilija Kocho wrote:
> 
> > Our GCC 4.3.2 is ageing and perhaps we should consider an upgrade.
> > My motive is it's lacking of support for Cortex-M4 SIMD (aka DSP)
> > and FPU instructions, but I think that other architectures shall
> > gain from newer compiler too. I have made some signal processing
> > tests with GCC 4.6.2 against current eCos compiler and they show
> > performance gain even with Cortex-M3 setting, though moderate.
> > Performance is considerable when Cortex-M4 setting is selected and
> > is tremendous, as expected, when SIMD are used. Recently introduced
> > Cortex-M products with FPU (Kinetis K70, K61, STM32F4) will further
> > emphasise the benefit.
> > 
> > Another reason, maybe not so important, is that GCC 4.3 is not
> > officially supported any more.
> > 
> > Regarding this, I state my wish that we move to the latest stable
> > GCC release, that is at present rel. 4.6.2, accompanied with
> > respective binutils. I have tested binutils 2.21 but in meantime
> > 2.22 has been released. Of course, the list wouldn't be complete
> > without the latest GDB.
> 
> Moving to a more recent GCC makes sense to me.
> 
> There are sure to be some new compiler warnings to deal with in the
> eCos sources. Are you aware of the scale of this issue with eCos CVS
> and GCC 4.6.2?
> 
> There are a few patches that were applied to current toolchain
> sources:
> 
>   ftp://ecos.sourceware.org/pub/ecos/gnutools/src/
> 
> It would be useful to review these and determine which are still
> relevant. Certainly we would need to adjust the multi-libbing for some
> target architectures.

Also we would take a look at the RTEMS (CVS -> 4.11) patches for their
latest toolchain sources as they does use GCC 4.6.1 & binutils 2.21 for
RTEMS (CVS) builds

  http://www.rtems.org/ftp/pub/rtems/SOURCES/4.11/
  
By the way I like their built-in __rtems__ definition for own GCC builds
and I guess in the end we would propagate __ecos__ for own ones on the
occasion of renewal. What do you think?

IMHO, we also would start to use own labels in the prefixes for eCos
toolchains (http://gcc.gnu.org/install/specific.html). What do you think
about 'ecos' label in the prefixes as an OS-label? In ideal world the
prefixes would be *-*-ecos2.0, *-*-ecos3.0, *-*-ecos4.0 for toolchains
for eCos major releases to prevent the PATH collisions, and, perhaps,
*-*-ecos<major>.<year>, for eCos middle time (not full tested) releases,
e.g.  i386-elf-ecos3.12-gcc for 2012. And may be to have *-*-ecos as the
prefixes is quite enough for us. (Excuse, if above looks like
OFF-TOPIC).

> It would also be useful to test eCos with the new toolchain in an
> automated manner. I wonder if one of the maintainers at eCosCentric
> could set up testing in their test farm? In any case, I would advocate
> a cautious approach to roll out, creating an initial "test release"
> for use mostly by those interested in the new features. We could also
> consider building the toolchain for arm-eabi targets only in the first
> instance to reduce overall effort. Does anyone on this list have a
> particular interest in building eCos with recent GCC for another
> target architecture?

IMHO, if we won't see volunteers for non arm-eabi targets also we should
test new toolchain for Linux synthetic target at least (it would help us
in the efforts on warning clean-ups for new toolchain).

Sergei

> It would be important to retain eCos source compatibility with the
> current toolchains based on GCC 4.3.2.
> 
> John Dallaway
> eCos maintainer
> http://www.dallaway.org.uk/john
> 

  reply	other threads:[~2012-01-14 16:02 UTC|newest]

Thread overview: 76+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-01-13 17:01 Ilija Kocho
2012-01-13 18:54 ` Bernard Fouché
2012-01-13 19:39   ` Ilija Kocho
2012-01-13 19:09 ` Frank Pagliughi
2012-01-13 19:45   ` Ilija Kocho
2012-01-14 10:22 ` John Dallaway
2012-01-14 16:02   ` Sergei Gavrikov [this message]
2012-01-15 17:36     ` Grant Edwards
2012-01-15 18:42       ` Sergei Gavrikov
2012-01-15 21:39         ` Stanislav Meduna
2012-01-23  1:01           ` Jonathan Larmour
2012-01-15 22:21         ` Ilija Kocho
2012-01-23  1:07           ` Jonathan Larmour
2012-01-15 22:21         ` Ilija Kocho
2012-01-16 15:20         ` Grant Edwards
2012-01-16 20:43           ` Sergei Gavrikov
2012-01-16 21:11             ` Sergei Gavrikov
2012-01-17  9:58               ` Bernard Fouché
2012-01-17 10:38                 ` Paul Beskeen
2012-01-17 12:28                   ` Sergei Gavrikov
2012-01-23  0:59     ` Jonathan Larmour
2012-01-14 16:25   ` Ilija Kocho
2012-01-23  1:13     ` Jonathan Larmour
2012-01-23 18:40       ` Ilija Kocho
2012-01-23 19:29         ` Jonathan Larmour
2012-01-25 12:30         ` Alex Schuilenburg
2012-01-25 20:59           ` Ilija Kocho
2012-01-26 13:36             ` Alex Schuilenburg
2012-01-26 20:18               ` Ilija Kocho
2012-02-13 22:02           ` eCos GNU tools 4.6.2-20120125 ready for testing [Was Re: Gnutools: consideration for upgrade to GCC 4.6] Ilija Kocho
2012-02-20 16:00             ` Alex Schuilenburg
2012-02-20 20:45               ` Ilija Kocho
2012-03-02 16:36             ` Alex Schuilenburg
2012-03-03 13:32               ` Ilija Kocho
2012-03-04  0:10                 ` Alex Schuilenburg
2012-03-04 17:49                   ` Sergei Gavrikov
2012-03-04 23:08                     ` Alex Schuilenburg
2012-03-04 19:37                   ` eCos GNU tools 4.6.2-20120125 ready for testing John Dallaway
2012-03-04 23:47                     ` Alex Schuilenburg
2012-03-05  8:00                       ` Sergei Gavrikov
2012-03-07 13:51                         ` Sergei Gavrikov
2012-03-07 11:58                       ` Alex Schuilenburg
2012-03-07 13:01                         ` Ilija Kocho
2012-03-07 13:39                           ` Sergei Gavrikov
2012-03-07 13:13                         ` John Dallaway
2012-03-12 16:43                           ` Alex Schuilenburg
2012-03-16 15:05                             ` Alex Schuilenburg
2012-03-08 17:28                         ` Alex Schuilenburg
2012-03-09  9:39                           ` Ilija Kocho
2012-03-09 17:15                             ` Alex Schuilenburg
2012-03-10 17:16                           ` John Dallaway
2012-03-12 16:12                             ` Alex Schuilenburg
2012-03-13 13:31                               ` Alex Schuilenburg
2012-03-13 14:16                                 ` Ilija Kocho
2012-03-13 17:47                                   ` Sergei Gavrikov
2012-03-15  8:50                                     ` John Dallaway
2012-03-17 14:50                                       ` Sergei Gavrikov
2012-03-17 20:58                                         ` John Dallaway
2012-03-17 16:44                                       ` Stanislav Meduna
2012-03-18 19:10                                   ` eCos GNU tools 4.6.3-20120315 [Was Re: eCos GNU tools 4.6.2-20120125 ready for testing] Ilija Kocho
2012-04-04 12:57                                     ` Lambrecht Jürgen
2012-04-04 13:18                                       ` Ilija Kocho
2012-05-31  8:42                                         ` eCos GNU tools 4.6.3-20120315 and link time optimization Bernard Fouché
2012-03-05  8:30                     ` eCos GNU tools 4.6.2-20120125 ready for testing Tomas Frydrych
2012-03-05  8:56                       ` Tomas Frydrych
2012-03-05  9:50                         ` John Dallaway
2012-03-05  9:55                           ` Anders Montonen
2012-03-05 14:20                             ` John Dallaway
2012-03-05 10:16                           ` Ilija Kocho
2012-03-05 12:56                             ` Tomas Frydrych
2012-03-03 12:58             ` eCos GNU tools 4.6.2-20120125 ready for testing [Was Re: Gnutools: consideration for upgrade to GCC 4.6] Sergei Gavrikov
2012-01-17  9:37 ` Gnutools: consideration for upgrade to GCC 4.6 Tomas Frydrych
2012-01-17 16:10   ` Stanislav Meduna
2012-01-17 16:25     ` Tomas Frydrych
2012-01-17 16:45     ` Ilija Kocho
2012-01-20 14:42       ` Frank Pagliughi

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