[oe] gcc-cross-sdk (GCC 4.2.3) limits.h woes

[Chris Conroy]

On Tue, 2009-08-18 at 12:50 -0700, Tom Rini wrote:
> 
> OK, here's the problem, I think.  You're trying to make an image for say
> i686-armv6-sdk-linux-gnueabi?  What are you expecting to be in this raw
> image however, the contents of say meta-toolchain, extracted and put
> into a ext2?  For most people, meta-toolchain, and the resulting tarball
> are the output that gets used.
> 

The problem is the dependencies get satisfied during the build because
package X depends on glibc, but external-toolchain.bb chimes in and says
"Hi, I provide virtual/libc." Package X builds and links just fine since
the external-toolchain dropped everything in the right place.

The problem comes whenever opkg needs to deal with dependencies since it
doesn't know about 'virtual/libc'. It sees that Package X wants glibc
and it can't find it since it only knows about the debian-named version
called 'libc6'. Glibc never gets built (since it's already been built)
and thus never gets debian renamed.

I don't see any easy path to change debian.bbclass since it requires
introspection on the TMPDIR which does not exist for users of an
external toolchain.

I hope this is clear. Let me know if there are any points of confusion.

In the meantime, turning off the renaming successfully works around this
bug.

--Chris Conroy