Universal Mach-O target for BFD

[David Daney]

Ryan Govostes wrote:
> I noticed that GDB 7, while it supports single-architecture Mach-O 
> files, does not like "universal" (fat) binaries.
> 
> I haven't done any hacking on gdb / binutils before, so I'm not sure of 
> the extent of changes that need to be made. I expect it's something like,
> 
> 1. Add support for universal binaries to BFD.
> 2. Add flags to GDB to select which architecture to extract.
> 
> For the first one, I'm not sure if there is precedent in BFD on how to 
> handle fat binaries, but here's the gist of how a multiarchitecture file 
> is laid out[1] (all in big-endian byte ordering):
> 
> 
> 1. The 4-byte magic number 0xCAFEBABE.

OT: Nice.  The same magic as java class files.  I wonder which came first.

David Daney