On Mon, Jul 13, 2009 at 05:25:35AM -0400, Mike Frysinger wrote:
On Sunday 12 July 2009 14:29:46 Wolfgang Denk wrote:
You mean it is impossible to build a tool chain for ARM that can be used to build U-Boot, Linux, and user space code? I can't believe that ARM support in GCC is that seriously broken.
basically, that is correct. arm's libgcc is just that whacky because of all the different ABIs that exist. although citing the Linux kernel here may not be appropriate because they specifically avoid libgcc -- because it's so screwed up.
Isn't that what multilib is for?
On a related note, I wish GCC had a "no-float" option that could be used in place of soft-float. It would be ABI-compatible with either soft or hard float, because it doesn't use float at all (GCC would raise an error if you try).
last i looked, some of the math functions in arm's libgcc depended on C library functions (like raise() and abort()). this is the kind of stuff Jean is trying to avoid.
It seems pretty reasonable for U-Boot to provide functions like raise()/abort() that take the place of a hardware exception, and display an error message.
-Scott