Re: [Qemu-devel] RFC: Qemu Guest Tools ISO

[Avi Kivity <avi@redhat.com>]

On 06/23/2011 06:25 PM, Anthony Liguori wrote:
>> Even building the tools would be very hard. In general if you build
>> against libc version y, you cannot expect your code to work against libc
>> version y-1, unless you take special measures. With other libraries the
>> "special measures" may not even be possible.
>
>
> Good libraries provide strong ABI compatibility.
>
> Something like glib clearly documents what version of the library 
> functions are available in, if you still to responsibly common 
> functions, ABI compatibility should be much of an issue.

I don't know about glib, but glibc only guarantees backward 
compatibility, not forward compatibility.  If you build against a newer 
glibc, your executable may not run with an older glibc, even if the 
symbols exist in both.

See [1] which touches on the issue; I don't have a better reference.

[1] ftp://ftp.kernel.org/pub/software/libs/glibc/hjl/compat/index.html

-- 
error compiling committee.c: too many arguments to function