Gcc flags for compatibility

[Jakub Jelinek]

On Mon, Jun 25, 2007 at 02:18:46PM -0700, Chuck Forsberg WA7KGX N2469R wrote:
> I would like to support development of my programs on my x86_64
> Fedora 7 server.  I need to cross compile for other Linux distros
> running on 386.  I tried ading   "-m32 -march=pentium " and -m32
> to the linker command but the resulting files bomb out with an
> immediate floating point exception on other systems including
> Backtrack 2.0 and Ubuntu 5.10.  The same source  files compiled
> on Ubuntu run fine on Fedora.

You can read FC6 release notes:
http://redhat.download.fedoraproject.org/pub/fedora/linux/core/6/i386/os/RELEASE-NOTES-en_US.html#id324893

If you want to build programs that will work on older distros, you
should use either compat-gcc-* instead of gcc-*, or link
with -Wl,--hash-style=sysv or -Wl,--hash-style=both.
In any case, you need to be lucky and not to use any glibc APIs with
recent symbol versions, as the older distros will not have them.

	Jakub