Re: x32_64 cross compiler

[Andrew Haley <aph-gcc at littlepinkcloud dot COM>]

NightStrike writes:
 > On Nov 10, 2007 3:57 PM, Diego . <eljedi@gmail.com> wrote:
 > > On Nov 10, 2007 5:49 PM, NightStrike <nightstrike@gmail.com> wrote:
 > > > On Nov 10, 2007 7:35 AM, Diego . <eljedi@gmail.com> wrote:
 > > > > Hello!!
 > > > >
 > > > > I'm triying to build a cross compiler for x32_64. I want to be able to
 > > > > build 64bits files from my 32bits linux machine.
 > > > >
 > > > > The problem i got now is some error, i tried some differents flags on
 > > > > configure. One of them is:  --target=x86_64-pc-linux-gnu , is it well?
 > > > > or the parameter should be another combination of the triplets?
 > > > >
 > > > > Thanks,
 > > > > Diego.
 > > > To build a cross compiler, you need a complete toolchain that targets
 > > > the environment that interests you.  In your case, you need to build
 > > > binutils with --target=x86_64-pc-linux, then a basic gcc (do make
 > > > all-gcc and make install-gcc), then a complete glibc using the basic
 > > > gcc you just build (when building the libc, target becomes host, host
 > > > becomes build, and build goes away).  Make and install that after
 > > > placing the basic gcc first in your PATH.  Then go back to the basic
 > > > gcc and do a full make / install.
 > > >
 > > > That's the quick and dirty outline method.
 > 
 > > Thanks nightStrike for te quick reply
 > >
 > > There's a clean method to build it? or better, any web thar explains that?
 > >
 > > Thanks again!!
 > 
 > There's a program called "crosstool" that automates the process,
 > though I've found it easier to just do it myself assuming you have all
 > the tools in place that you need.  Check here:
 > http://www.kegel.com/crosstool/current/doc/crosstool-howto.html
 > 
 > If you get stuck, I could probably build you a toolchain real fast and
 > send you a log of what I did so that you can see each command and how
 > it works.

This is an excruciatingly hard way to build a Linux-Linux cross
compiler.  The easy way is to copy libraries from a 64-bit Linux
system to a 32-bit system and then to build the compiler with

    --enable-targets=all

Andrew.