OSDev.org

I'm just porting my OS to x86_64 and I'm stuck with some toolchain problems.

First of all, I built a toolchain, i.e. binutils and gcc that are x86_64 targeted. Since my build system is a i686 pc with cygwin, I need to build cross compilers. My OS uses ELF executables, so I need a x86_64-elf targeted cross compiler. But when I configure binutils and gcc, it tells me that --target=x86_64-elf is not supported. So I followed this hint:

http://www.mega-tokyo.com/osfaq2/index. ... s-Compiler

Now I got a cross compiler that is x86_64-pc-linux-gnu targeted, but without any Linux libraries. It works fine when I compile my source files manually using options -nostartfiles and -nostdlib. But for my OS I use autoconf to check for the presence of a compiler and tries to compile a c++ file to check if this compiler works. In this case it doesn't work because my auto generated configure script tries to compile a Linux executable, which doesn't work without the libraries.

Does anyone know how to create a toolchain that runs on i686 cygwin, works with autoconf and creates plain x86_64 ELF executables?

Thanks in advance!

i would suggest asking candy, since he has the most experience with x86-64 cross-compilers
afaik he doesn't visit this board -- try asking on the (very active) board where you found the info -- mega-tokyo!

[url=http://www.mega-tokyo.com/forum/]
Mega-Tokyo Message Board - Index[/url]