Version checking is broken about pkg-config-rs HOT 4 CLOSED

Interesting, what version of pkg-config do you have? For me it looks like:

$ pkg-config --help
Usage: pkg-config [OPTION...]                                                                                       
      ...
      --atleast-version=VERSION               return 0 if the module is at least version VERSION                    
      ...

$ pkg-config --version
0.26

from pkg-config-rs.

Interesting indeed. This is with pkg-config version 0.28. I didn't expect that to be a recent change.
Indeed my --help and man page says the same thing as yours, but the tool behaves as though the whole bunch of --exists, --atleast-version=VERSION, --exact-version=VERSION, and --max-version=VERSION are to be used on their own. Possibly the syntax I mentioned above is now preferred, because anything else is not workable when checking for multiple libraries at the same time, but for now that's a wild guess.

from pkg-config-rs.

Okay, so I have investigated a bit more. Apparently --exists is the default output mode and can be mixed with --{atleast,exact,max}-version, but only one of them. Any other output mode option (--libs, --cflags, etc.) does not work in conjunction with them. Indeed the change is not exactly recent (2012), but within the 0.28 time frame. The exact commit is http://cgit.freedesktop.org/pkg-config/commit/?id=548ba5b223b28370f1ebad51dd7ae298e4be1428 and was regarded as a bug fix.

from pkg-config-rs.

Very interesting! Thanks for investigating :)

I've pushed a fix which uses the new syntax now.

from pkg-config-rs.