fingolfin, I think you misunderstand how ELF shared library versioning works
under at least Linux, you can either bump the LIBTOOL version macros claiming
to be backward compatible, at which point the filename would change from the
current libusb-1.0.so.0.1.0 to ie libusb-1.0.so.0.2.0, but the soname, which is
what the linker uses stays libusb-1.0.so.0, and that is what the linker, etc.
uses, so an app linked against libusb-1.0.so.0.2.0 would still happily (from
the ld.so pov) run with libusb-1.0.so.0.1.0 .
Or you can bump the LIBTOOL version macros in such a way that the soname
changes too, to ie
libusb-1.0.so.1, at which point you loose backwards compatibility with
existing apps. And since the libusbx-1.0.x releases are deliberately and
painstakingly kept ABI and API compat with older 1.0.x release that is not
really an option.
At least under Linux there is simply no way (with libtool) to automatically
make things so that applications needing at least version x will automatically
fail to start with older versions, I know the libtool docs claim otherwise, but
they are 100% wrong.
There is a solution for this, which is using so called versioned symbols, this
has the added advantages that apps build against a new version but not using
any new functions will still work with older versions of the library. I would
very much like to see libusbx use symbol versioning (at least under Linux), as
that is a real solution, patches welcome.
As for your patch to change the libtool version macro-s as Pete explained this
causes issues under Windows, and we gain nothing by changing them (unless we
change them in an ABI breaking way, which is a no go), so we're not going to
make those changes.
---
Reply to this email directly or view it on GitHub:
https://github.com/libusbx/libusbx/pull/122#issuecomment-23396235
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