Compiling for i586 architecture - illegal instruction on executable

[Florian Weimer]

* Renato Mendes:

> Is the -march=i586 parameter the only thing needed ? Isn´t it logical
> to gcc to choose the correct 586 libraries in that case ?

Typically, there is only one set of libraries in a GCC installation,
at least for i386 targets.

> Does that Illegal instruction problem come from libraries that is
> linked using a 686 architecture ?

Probably.

> How can I tell the compiler to use the 585 libraries ?

You will have to rebuild the compiler with the appropriate flags, or
use an operating system that is compatible with the i586 architecture.
Debian should work.