Re: How do I compile GCC to generate MIPS code ?

[Kumba <kumba@gentoo.org>]

Leonel Gayard wrote:
> Hi all,
> 
> I have recently started to study the MIPS architecture. For instance,
> I wanted to have GCC compile C code into MIPS assembly and run it in
> SPIM. (I have an Intel machine running Linux).
> 
> So I want to try something like this:
> 
> gcc -Wall -pedantic -S --march=mips1 test.c
> 
> in order to have it generate MIPS assembly.
> 
> It does not work. All I get is:
> 
> cc1: error: bad value (mips32) for -march= switch
> cc1: error: bad value (mips32) for -mcpu= switch
> 
> Clearly, I need to recompile GCC so it has MIPS in its available
> architectures. Remark, this is not cross-compiling, because I want GCC
> to run on an i686 machine, it just generates MIPS code.
> 
> Can any one help me do this ?
> 
> Thank you
> Leonel

Cross compiling is the (black) art of building a compiler that runs on Arch X, 
but generates code for Arch Y.  You definitely do not want to replace your 
system compiler (that is, i686-pc-linux-gnu-gcc) with a mips one, cause then 
you won't be able to rebuild i686 packages.  You want a second compiler to be 
available capable of handling mips-unknown-linux-gnu.


--Kumba

-- 
"Such is oft the course of deeds that move the wheels of the world: small 
hands do them because they must, while the eyes of the great are elsewhere." 
--Elrond