Jakub,
this version makes the following changes to the earlier version.
*) Renames things to FOO_ver, rather than FOO_2
*) No attempt to deal with cross-version plugins and libgomp.
*) Adds GOMP_OFFLOAD_version function to plugin. (I went with your approach).
Returns the GOMP_VERSION used to build the plugin, which libgomp checks matches
the value for its build. When we make incompatible changes to the plugin
interface, that value can be incremented.
*) While working on gomp_load_plugin_for_device, I noticed the DLSYM and
DLSYM_OPT macros were somewhat funky. We're loading functions, so don't expect
a NULL value. We can simply check the returned value and only need dlerror when
we get NULL. The counting that DLSYM_OPT does was somewhat funky too. IMHO
better for that macro to simply return a truth value.
ok for trunk?