[poky] gcc multilib

[Jonathan Richardson]

Resending to include mailing list.



I can change the binaries makefiles/recipes easily enough to take an
alternate path to the soft fp libs (ie- /lib-softfp) or whatever it turns
out to be, as long as it's some oddball location that isn't included in the
standard CFLAGS search path. I'd want the regular machine configuration to
have /lib/libgcc.so with hard fp and then some other location can have the
soft fp versions, I don't really care where that is as long as it exists
and I can point to it. I assume it would be under the same sysroot. Are
there any examples of this?



Thanks.



On Thu, Feb 18, 2016 at 1:19 PM, Richard Purdie <
richard.purdie at linuxfoundation.org> wrote:

On Thu, 2016-02-18 at 12:01 -0800, Jonathan Richardson wrote:
> We have a machine configured for hard floating point. This builds a
> hard fp version of libgcc. We also have some bootloaders and other
> code that require libgcc but use soft fp. I would prefer to keep the
> bootloaders using soft fp. Is there a way to configure libgcc to
> produce both hard and soft fp versions of libraries? There are
> multilib examples for 32 and 64 versions of libs but it’s not clear
> to me how to specify other compiler options to produce multiple
> versions of the libraries.

The bigger question you face is where these binaries expect your libgcc
and perhaps dynamic loader to reside. Its straight forward enough to
configure the system to build two versions with different tunes but one
would need to live in /lib and the other in /lib32 or some other /libXX
location. The way the multilib setup works, it doesn't really care
which configuration you use for a given location.

Cheers,

Richard
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