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Re: Binutils backwards incompatibilities?
- From: Nick Clifton <nickc at redhat dot com>
- To: jbaker at qnx dot com
- Cc: binutils at sources dot redhat dot com
- Date: Tue, 30 Nov 2004 17:18:27 +0000
- Subject: Re: Binutils backwards incompatibilities?
- References: <41AC533F.8040701@redhat.com> <41AC99A5.8050002@qnx.com>
Hi Jeff,
I am aware of a couple of incompatibilities with SH4 support. For one a
subset of the relocations were renumbered; the second involves the
treatment of relocation addends. We ship our kernel in such a manner
that it needs to be relocated as it's being added to a boot image. The
relocation addend change means that you can't relocate a kernel built
with an older toolchain with the newer toolchain or vice versa.
Is this the kind of stuff I'd find in the NEWS files?
Not really no. The gas/NEWS file does mention that SH4A support was
added for 2.15 but nothing is mentioned about reloc renumbering.
The long answer to your original question is that there is no formal
system for collecting potential incompatibilities between different
binutils releases and documenting them. Thus if you need to find out if
a newer release will still work with binaries created with an older
release the only way to be sure is to try it and see.
Cheers
Nick