Add "c_long_size" guard, supplanting "wordsize" and stop using Integer#size

What a "word" is when talking about sizes is confusing because it's a
highly overloaded term. Intel, Microsoft, and GDB are just a few vendors
that have their own definition of what a "word" is. Specs that used the
"wordsize" guard actually were mostly testing for the size of the C
`long` fundamental type, so rename the guard for clarity.

Also, get the size of `long` directly from RbConfig instead of guessing
using Integer#size. Integer#size is not guaranteed to have anything to
do with the `long` type.

1 files changed, 1 insertions, 1 deletions

diff --git a/spec/ruby/library/bigdecimal/sqrt_spec.rb b/spec/ruby/library/bigdecimal/sqrt_spec.rb
index 8fd1ec0f39..42cf4545cb 100644
--- a/spec/ruby/library/bigdecimal/sqrt_spec.rb
+++ b/spec/ruby/library/bigdecimal/sqrt_spec.rb
@@ -36,7 +36,7 @@ describe "BigDecimal#sqrt" do
     BigDecimal('121').sqrt(5).should be_close(11, 0.00001)
   end
 
-  platform_is_not wordsize: 32 do # fails on i686
+  platform_is_not c_long_size: 32 do # fails on i686
     it "returns square root of 0.9E-99999 with desired precision" do
       @frac_2.sqrt(1).to_s.should =~ /\A0\.3E-49999\z/i
     end