Is cygwin1.dll backward compatible?
David Starks-Browning
starksb@ebi.ac.uk
Sat Oct 20 08:18:00 GMT 2001
On Saturday 20 Oct 01, egor duda writes:
> ... if/when cygwin team is about to make backward-incompatible
> changes to cygwin, dll is supposed to be renamed to cygwin2.dll
>
> you can look at "api major" and "api minor" lines in output from
> 'cygcheck -v -s'. "api minor" is incremented whenever anybody makes
> forward-incompatible changes to dll (such as exporting new function or
> data from dll). "api major" is incremented whenever backward-
> incompatible change is made.
There is an entry in the API section of the FAQ, but it has not been
updated since B19:
Q. What version numbers are associated with Cygwin?
A. There is a cygwin.dll major version number that gets incremented
every time we make a new Cygwin release available. This
corresponds to the name of the release (e.g. beta 19's major
number is "19"). There is also a cygwin.dll minor version
number. If we release an update of the library for an existing
release, the minor number would be incremented.
There are also Cygwin API major and minor numbers. The major
number tracks important non-backward-compatible interface changes
to the API. An executable linked with an earlier major number will
not be compatible with the latest DLL. The minor number tracks
significant API additions or changes that will not break older
executables but may be required by newly compiled ones.
Then there is a shared memory region compatibity version
number. It is incremented when incompatible changes are made to
the shared memory region or to any named shared mutexes,
semaphores, etc.
Finally there is a mount point registry version number which keeps
track of non-backwards-compatible changes to the registry mount
table layout. This has been "B15.0" since the beta 15 release.
It would be great if someone could provide the text that brings it up
to date. Maybe I just have to remove references to "beta 19"? What
about the mount table? I guess now it's "mount v2"?
Thanks,
David
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