[U-Boot-Users] GCC version for Linux kernel?

[U-Boot-Users] GCC version for Linux kernel?

[Allen Curtis]

I am using GCC 3.4.2 for PowerPC. When you compile the Linux 2.4 PPC 
kernel you get lots of "deprecated" warning messages from the compiler. 
What is the recommended GCC version?
TIA

[U-Boot-Users] GCC version for Linux kernel?

[Wolfgang Denk]

In message <3e305f527ea735cc8356c4045027b08d@onz.com> you wrote:
> I am using GCC 3.4.2 for PowerPC. When you compile the Linux 2.4 PPC 
> kernel you get lots of "deprecated" warning messages from the compiler. 
> What is the recommended GCC version?

GCC < 3.4.x (We use GCC 3.3.3 in our ELDK).

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de
The day-to-day travails of the IBM programmer are so amusing to  most
of us who are fortunate enough never to have been one - like watching
Charlie Chaplin trying to cook a shoe.

[U-Boot-Users] GCC version for Linux kernel?

[Marc Leeman]

> GCC < 3.4.x (We use GCC 3.3.3 in our ELDK).

Unfortunately gcc 3.4.x produces faster code for PPC. We compile U-Boot
with the eldk compiler and everything else with gcc-3.4.3 (buildroot
toolchain).

IIRC, the difference was about >10-15% for parsing mpeg streams.

-- 
  greetz, marc
Revenge is a feast best served immediately.
	D'Argo - Dog With Two Bones
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[U-Boot-Users] GCC version for Linux kernel?

[Bryan O'Donoghue]

Marc Leeman wrote:
>>GCC < 3.4.x (We use GCC 3.3.3 in our ELDK).
> 
> 
> Unfortunately gcc 3.4.x produces faster code for PPC. We compile U-Boot
> with the eldk compiler and everything else with gcc-3.4.3 (buildroot
> toolchain).
> 
> IIRC, the difference was about >10-15% for parsing mpeg streams.
> 

I've compiled U-Boot & Kernel with 3.4.2... the only thing that seems to
fail in this process (obscurely) is hello_world, whereas the rest of the
tree seems quite happy to compile *without* error/warning !

Granted.. U-Boot doesn't currently actually boot on my board, but,
/that's/ just a matter of time/proffering sacrifice to the gods of
SDRAM-UPM configuration. Easy !

--

Bryan

[U-Boot-Users] GCC version for Linux kernel?

[Marc Leeman]

> tree seems quite happy to compile *without* error/warning !
> Granted.. U-Boot doesn't currently actually boot on my board, but,

That's my experience too. But time is not only an issue on the board
itself :( It's on my todo list though...

-- 
  greetz, marc
That's your plan? Wile E. Coyote would come up with a better plan
than that!
	Crichton - Throne for a Loss
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[U-Boot-Users] GCC version for Linux kernel?

[Allen Curtis]

>> tree seems quite happy to compile *without* error/warning !
>> Granted.. U-Boot doesn't currently actually boot on my board, but,
>
> That's my experience too. But time is not only an issue on the board
> itself :( It's on my todo list though...
>
Most of the "warnings" I was referring to are from the 
linuxppc-2.4_devel_* kernel from the FTP site. U-Boot compiled cleanly 
compared to this.

[U-Boot-Users] GCC version for Linux kernel?

[Marc Leeman]

> Most of the "warnings" I was referring to are from the 
> linuxppc-2.4_devel_* kernel from the FTP site. U-Boot compiled cleanly 
> compared to this.

I'm using the linux.org kernel and it compiles cleanly. I seem to
remember some warnings in a transition from one version to another, but
I cannot remember what the compiler versions were.

I've been picking up the stable ones since 2.4.21 (...-2.4.31) for our
systems.

-- 
  greetz, marc
One Mippippippi... Two Mippippippi...
	D'Argo - Through the Looking Glass
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[U-Boot-Users] GCC version for Linux kernel?

[Detlef Vollmann]

Allen Curtis wrote:
> Most of the "warnings" I was referring to are from the
> linuxppc-2.4_devel_* kernel from the FTP site. U-Boot compiled cleanly
> compared to this.
Warning!  from gcc-3.3 to gcc-3.4 the handling of the attribute
'unused' changed.  For that reason, compiling a linux-2.4 kernel
with gcc-3.4 will break silently!

 Detlef

-- 
Detlef Vollmann   vollmann engineering gmbh
Linux and C++ for Embedded Systems    http://www.vollmann.ch/

[U-Boot-Users] GCC version for Linux kernel?

[Marc Leeman]

> Warning!  from gcc-3.3 to gcc-3.4 the handling of the attribute
> 'unused' changed.  For that reason, compiling a linux-2.4 kernel
> with gcc-3.4 will break silently!

Euhm. I've been doing this for 5 months without any problem for PPC.

-- 
  greetz, marc
You honestly believe I could find you appealing? I mean, you're so,
so, blue!
	Rygel - DNA Mad Scientist
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[U-Boot-Users] GCC version for Linux kernel?

[Bryan O'Donoghue]

Marc Leeman wrote:
>>Warning!  from gcc-3.3 to gcc-3.4 the handling of the attribute
>>'unused' changed.  For that reason, compiling a linux-2.4 kernel
>>with gcc-3.4 will break silently!
> 
> 
> Euhm. I've been doing this for 5 months without any problem for PPC.
> 

I had a quick

grep -rs attrib | grep unused | grep -v Binary

On my Kernel source tree... and assuming that unused is indeed
incorrectly handled... or rather differently handled, between 3.3.x and
3.4.x ... you probably wouldn't notice the difference, unless you were
using SCSI, or the 8390 driver on powerpc.

--

Bryan

[U-Boot-Users] GCC version for Linux kernel?

[Gerhard Jaeger]

On Wednesday 15 June 2005 09:12, Marc Leeman wrote:
> > Warning!  from gcc-3.3 to gcc-3.4 the handling of the attribute
> > 'unused' changed.  For that reason, compiling a linux-2.4 kernel
> > with gcc-3.4 will break silently!
> 
> Euhm. I've been doing this for 5 months without any problem for PPC.
> 

Same here ;)

Compiling U-Boot (latest CVS) is no problem on gcc-3.4.3, as long, as
you are not addressing ARM targets and of course it works!

For kernel compilation, you need at least kernel 2.4.28 or higher when
using gcc 3.4.x - or some patches that fix these attribute issues
(and other stuff, that changed)

Ciao,
Gerhard

-- 
Gerhard Jaeger <gjaeger@sysgo.com>            
SYSGO AG                      Embedded and Real-Time Software
www.sysgo.com | www.elinos.com | www.pikeos.com | www.osek.de 

[U-Boot-Users] GCC version for Linux kernel?

[Bryan O'Donoghue]

Gerhard Jaeger wrote:
> On Wednesday 15 June 2005 09:12, Marc Leeman wrote:
> 
>>>Warning!  from gcc-3.3 to gcc-3.4 the handling of the attribute
>>>'unused' changed.  For that reason, compiling a linux-2.4 kernel
>>>with gcc-3.4 will break silently!
>>
>>Euhm. I've been doing this for 5 months without any problem for PPC.
>>
> 
> 
> Same here ;)
> 
> Compiling U-Boot (latest CVS) is no problem on gcc-3.4.3, as long, as
> you are not addressing ARM targets and of course it works!
> 
> For kernel compilation, you need at least kernel 2.4.28 or higher when
> using gcc 3.4.x - or some patches that fix these attribute issues
> (and other stuff, that changed)


Ah yes, someone (you?) already mentioned that on linuxppc-embedded.

I run 2.4.28-pre3 !

[U-Boot-Users] GCC version for Linux kernel?

[Allen Curtis]

> On Wednesday 15 June 2005 09:12, Marc Leeman wrote:
>>> Warning!  from gcc-3.3 to gcc-3.4 the handling of the attribute
>>> 'unused' changed.  For that reason, compiling a linux-2.4 kernel
>>> with gcc-3.4 will break silently!
>>
>> Euhm. I've been doing this for 5 months without any problem for PPC.
>>
>
> Same here ;)
>
> Compiling U-Boot (latest CVS) is no problem on gcc-3.4.3, as long, as
> you are not addressing ARM targets and of course it works!
>
> For kernel compilation, you need at least kernel 2.4.28 or higher when
> using gcc 3.4.x - or some patches that fix these attribute issues
> (and other stuff, that changed)
>
The PPC devel version on the Denx FTP site is 2.4.25.

[U-Boot-Users] GCC version for Linux kernel?

[Detlef Vollmann]

Marc Leeman wrote:
> > Warning!  from gcc-3.3 to gcc-3.4 the handling of the attribute
> > 'unused' changed.  For that reason, compiling a linux-2.4 kernel
> > with gcc-3.4 will break silently!
> 
> Euhm. I've been doing this for 5 months without any problem for PPC.
That is what "will break silently!" means.
I used a 3.4 compiler for several weeks, until I tracked down
a problem I didn't notice before to the compiler version.

Actually, the ARM version of U-Boot (at least 1.1.2) has the same
problem (in include/asm-arm/setup.h).

 Detlef

-- 
Detlef Vollmann   vollmann engineering gmbh
Linux and C++ for Embedded Systems    http://www.vollmann.ch/

[U-Boot-Users] GCC version for Linux kernel?

[Allen Curtis]

>> GCC < 3.4.x (We use GCC 3.3.3 in our ELDK).
>
> Unfortunately gcc 3.4.x produces faster code for PPC. We compile U-Boot
> with the eldk compiler and everything else with gcc-3.4.3 (buildroot
> toolchain).
>
I am handing this off to non-Linux people. A single toolchain is best.