Predefined Compiler Flag for CROSS_COMPILE in ELDK

Predefined Compiler Flag for CROSS_COMPILE in ELDK

[rodolfo]

Hi,

I using ppc_4xx- cross-compiler for build linux in xup virtex II pro.
How can I change -mpcu compiler flag for a specific vallue for my
board/processor? 

Thanks,

Re: Predefined Compiler Flag for CROSS_COMPILE in ELDK

[Detlev Zundel]

Hi Rodolfo,

> I using ppc_4xx- cross-compiler for build linux in xup virtex II pro.
> How can I change -mpcu compiler flag for a specific vallue for my
> board/processor? 

Do the obvious thing - specify it on every command line.

Cheers
  Detlev

-- 
"Oh, didn't you know, the Lord did the original programming of the universe in
COBOL." - "That's why the world is the evil work of Satan. A true divine being
would have used Scheme."  -  "And, if so, Jesus would have been crucified on a
big lambda symbol."  -- K. Chafin, K. Schilling & D. Hanley, on comp.lang.lisp
--
DENX Software Engineering GmbH,      MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich,  Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-40 Fax: (+49)-8142-66989-80 Email: dzu@denx.de

Re: Predefined Compiler Flag for CROSS_COMPILE in ELDK

[rodolfo]

Detlev,

-mcpu is deprecated:

HOSTCC  scripts/basic/fixdep
`-mcpu=' is deprecated. Use `-mtune=' or '-march=' instead.
scripts/basic/fixdep.c:1: error: bad value (405) for -mtune= switch
make[1]: ** [scripts/basic/fixdep] Erro 1
make: ** [scripts_basic] Erro 2


then I put -march=405 and give this errors:

scripts/basic/fixdep.c:1: error: bad value (405) for -march= switch
scripts/basic/fixdep.c:1: error: bad value (405) for -mtune= switch
make[1]: ** [scripts/basic/fixdep] Erro 1
make: ** [scripts_basic] Erro 2

See a piece of my Makefile:

HOSTCC       = gcc
HOSTCXX      = g++
HOSTCFLAGS   = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
-march=405
HOSTCXXFLAGS = -O2


How can I do this?

Thanks,


On Wed, 30 Apr 2008 18:59:05 +0200, Detlev Zundel <dzu@denx.de> wrote:
> Hi Rodolfo,
> 
>> I using ppc_4xx- cross-compiler for build linux in xup virtex II pro.
>> How can I change -mpcu compiler flag for a specific vallue for my
>> board/processor?
> 
> Do the obvious thing - specify it on every command line.
> 
> Cheers
>   Detlev
> 
> --
> "Oh, didn't you know, the Lord did the original programming of the
> universe in
> COBOL." - "That's why the world is the evil work of Satan. A true divine
> being
> would have used Scheme."  -  "And, if so, Jesus would have been crucified
> on a
> big lambda symbol."  -- K. Chafin, K. Schilling & D. Hanley, on
> comp.lang.lisp
> --
> DENX Software Engineering GmbH,      MD: Wolfgang Denk & Detlev Zundel
> HRB 165235 Munich,  Office: Kirchenstr.5, D-82194 Groebenzell, Germany
> Phone: (+49)-8142-66989-40 Fax: (+49)-8142-66989-80 Email: dzu@denx.de
> 
> _______________________________________________
> Linuxppc-embedded mailing list
> Linuxppc-embedded@ozlabs.org
> https://ozlabs.org/mailman/listinfo/linuxppc-embedded

Re: Predefined Compiler Flag for CROSS_COMPILE in ELDK

[Detlev Zundel]

Hi Rodolfo,

> -mcpu is deprecated:
>
> HOSTCC  scripts/basic/fixdep
> `-mcpu=' is deprecated. Use `-mtune=' or '-march=' instead.
> scripts/basic/fixdep.c:1: error: bad value (405) for -mtune= switch
> make[1]: ** [scripts/basic/fixdep] Erro 1
> make: ** [scripts_basic] Erro 2

Uhu - HOSTCC is the native compiler, which very likely does not know
anything about 405 cpus...

> then I put -march=405 and give this errors:
>
> scripts/basic/fixdep.c:1: error: bad value (405) for -march= switch
> scripts/basic/fixdep.c:1: error: bad value (405) for -mtune= switch
> make[1]: ** [scripts/basic/fixdep] Erro 1
> make: ** [scripts_basic] Erro 2

Still, same problem - you want to use the flag for the cross compiler.

> See a piece of my Makefile:
>
> HOSTCC       = gcc
> HOSTCXX      = g++
> HOSTCFLAGS   = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
> -march=405
> HOSTCXXFLAGS = -O2

Again, this is the host compiler.

> How can I do this?

If we are only talking about compiling a recent linux kernel, then the
easiest way is to simply override CFLAGS_KERNEL from the commandline,
i.e.:

make CFLAGS_KERNEL=-mcpu=405 uImage

If you want to check that this works, do a

make CFLAGS_KERNEL=-mcpu=405 V=1 uImage

and check the generated command lines.

Cheers
  Detlev

-- 
Alisa Sherer (AMD) suggested that consumer demand will not follow
faster clock speeds. Marketing might help with this problem, she
added.                                            -- 2004/02/20
--
DENX Software Engineering GmbH,      MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich,  Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-40 Fax: (+49)-8142-66989-80 Email: dzu@denx.de