Michael Henry wrote:
> On Fedora 19, Vim's configure script no longer correctly detects
> the version of Ruby. Vim's current algorithm involves the Ruby
> expression ``RbConfig::CONFIG['ruby_version']``, which returns a
> string such as "1.9.1" on Fedora 17. On Fedora 19, the above
> Ruby expression returns an empty string.
>
> It appears to me that this is due to a change in Fedora. In the
> ticket linked below, the maintainer asserts that querying
> ``ruby_version`` is incorrect, as that variable can have
> arbitrary contents:
> https://bugzilla.redhat.com/show_bug.cgi?id=923703#c1
>
> Empirically, I can verify that the behavior has changed. On
> Fedora 17, the query works:
>
> $ ruby -r rbconfig -e "puts RbConfig::CONFIG['ruby_version']"
> 1.9.1
>
> On Fedora 19, this same query prints the empty string.
>
> The following patch changes the Ruby version detection algorithm
> to check the ``VERSION`` and ``RUBY_VERSION`` variables as used
> earlier in Vim's configure script. Essentially, the query
> becomes::
>
> $ ruby -e "puts ((VERSION rescue RUBY_VERSION))"
> 1.9.3
>
> This works on Fedora 19 as well::
>
> $ ruby -e "puts ((VERSION rescue RUBY_VERSION))"
> 2.0.0
>
> Given that Vim's configure script relies on this same check
> to ensure the version is at least "1.6.0", it seems reasonable
> to me to use this algorithm (though I'm no Ruby expert).
>
>
> Here is the patch against Vim 7.4.14:
Thanks. I cannot think of a reason to first check for the Ruby version
one way and then another way. It works on my system as well.
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