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Re: How to enable soft-float support in newlib and gcc toolchains for an i386 target


On 08/02/2011 06:16 AM, Mian M. Hamayun wrote:
Hello Everyone,

I am newbie to newlib and gcc toolchains, so my question may be a little ambiguous for this forum.

In fact I am trying to build a gcc toolchain with newlib for an i386 target which doesn't support hw float/mmx instructions. In fact it is a virtual machine which I am targeting.
So when I compile my applications with "-msoft-float" flag, I get quite a few unresolved symbols.


The support of the soft-float multilibs is dependent on the
target which the compiler was built for.   And the gcc version.
Without that information, it is hard to answer.


For Example:
Sources/susan.c:979: undefined reference to `__floatsisf'
Sources/susan.c:979: undefined reference to `__divsf3'
Sources/susan.c:1626: undefined reference to `__subdf3'
Sources/susan.c:1628: undefined reference to `__mulsf3'
...

These are gcc support methods. So it is up to how gcc is built.
So my obvious 'guess' is to rebuild the gcc toolchain and/or newlib using "--with-float=soft" and/or "--enable-soft-float" options. But so far I haven't been able to build a toolchain that solves this issue.

Any help / pointers in this regard will be greatly appreciated.
Please also point-out if this is not the right forum for this type of question.


Best Regards,
Hamayun



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