[ODE] Architecture tunning

[Bram Stolk]

Rodrigo Hernandez wrote:
> 
> Note that fast and OPCODE require specific C Flags, in fact generic
> flags are not used when building any of the targets.

That is why the Makefile.am files should be adjusted.

If specific flags are set, they should be *added* by user provided
flags.

I would say, fix the Makefile.am files, so that ode building
conforms to the defacto standards.

  Bram

> 
> Bram Stolk wrote:
> 
>> Rodrigo Hernandez wrote:
>>  
>>
>>> I just added the option --with-arch= to the configure script, this is
>>> an optional algument to configure and just adds the flag -march= to
>>> gcc CPP Flags, enabling the use of
>>> the architecture extensions such as MMX or SSE by the compiler.
>>>   
>>
>>
>>
>> A better approach would be to use generic vars:
>>
>> CFLAGS="-O3 -march=pentium4" ./configure --with-prefix=$HOME
>>
>> This would work, but requires a small adaptation to Makefile.am so that
>> AM_CFLAGS = $(CFLAGS) -I$(topsrcdir)/include -I$(top_builddir)/include
>>
>> This enables more switches than your march-specific switch.
>>
>> Also, it is the standard method for controlling the compile options using
>> an autoconf/automake build system.
>>
>>  Bram
>>
>>
>>  
>>
>>> the usage for example for a Pentium 4 would be:
>>>
>>> configure --with-arch=pentium4
>>>
>>> for an Athlon XP:
>>>
>>> configure --with-arch=athlon-xp
>>>
>>> for a list of all posible options check:
>>>
>>> http://gcc.gnu.org/onlinedocs/gcc-3.4.1/gcc/i386-and-x86-64-Options.html#i386%20and%20x86-64%20Options
>>>
>>>
>>> Note that that page lists the architecture posibilities for Intel
>>> based processors, but other architectures such as MIPS also have
>>> support for the -march flag.
>>>
>>> Cheers!
>>> _______________________________________________
>>> ODE mailing list
>>> ODE at q12.org
>>> http://q12.org/mailman/listinfo/ode
>>>   
>>
>>
>>
>>  
>>
> 


-- 
Bram Stolk, VR Engineer SARA, Amsterdam.   tel +31 20 592 3000

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