Revert bigdecimal 1.4.0 related commits

* Revert "Remove unnecessary linker flags"

  This reverts commit 49efa01579272d52d28bd361c498d96ca92e986e.

* Revert "Move dependency on gemspec"

  This reverts commit bfb64d476578eadd61a738149726da37840f068d.

* Revert "Remove unnecessary directory listing"

  This reverts commit 86661b5c60b8da6e5641c9c772b57857a1f988f4.

* Revert "* expand tabs."

  This reverts commit 35ada33f8386b56611f10b1a0a4e5667e9b08071.

* Revert "Import bigdecimal-1.4.0.pre-20181204a"

  This reverts commit 8891bb3bd602bdbabd24260cf1e431475dc027c8.

* Revert "ext/bigdecimal/bigdecimal.c: drop unused function"

  This reverts commit 5ceeea4da1179193c2c7ddcebfd67019128473e3.

* Revert "* expand tabs."

  This reverts commit e021386e905b6d6799a84dfbc2f0592e42626366.

* Revert "Import bigdecimal-1.4.0.pre-20181130a"

  This reverts commit a0e438cd3c28d2eaf4efa18243d5b6edafa14d88.

* Revert "NEWS: write about bigdecimal updates"

  This reverts commit 89455ff2ba973f2a9ee7b79657e0e6f1f31501f9.

* Revert "Fix rubyspec of bigdecimal for ruby <2.6"

  This reverts commit 4bcdeeb65e57de4da306d347652898c767162e74.

* Revert "Fix rubyspec against bigdecimal updates"

  This reverts commit c8fb30fc9e0ee14e87be1e231869a12aaef1eedf.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66210 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

2 files changed, 9 insertions, 24 deletions

diff --git a/ext/bigdecimal/lib/bigdecimal/jacobian.rb b/ext/bigdecimal/lib/bigdecimal/jacobian.rb
index 84c50248b7..9cad06c09b 100644
--- a/ext/bigdecimal/lib/bigdecimal/jacobian.rb
+++ b/ext/bigdecimal/lib/bigdecimal/jacobian.rb
@@ -21,9 +21,6 @@
 #
 # fx is f.values(x).
 #
-
-require 'bigdecimal'
-
 module Jacobian
   module_function
 
diff --git a/ext/bigdecimal/lib/bigdecimal/util.rb b/ext/bigdecimal/lib/bigdecimal/util.rb
index 88f490cb45..911fa6fe3a 100644
--- a/ext/bigdecimal/lib/bigdecimal/util.rb
+++ b/ext/bigdecimal/lib/bigdecimal/util.rb
@@ -5,8 +5,6 @@
 # and provides BigDecimal#to_d and BigDecimal#to_digits.
 #++
 
-require 'bigdecimal'
-require 'bigdecimal/util.so'
 
 class Integer < Numeric
   # call-seq:
@@ -44,8 +42,8 @@ class Float < Numeric
   #
   # See also BigDecimal::new.
   #
-  def to_d(precision=Float::DIG)
-    BigDecimal(self, precision)
+  def to_d(precision=nil)
+    BigDecimal(self, precision || Float::DIG)
   end
 end
 
@@ -66,6 +64,13 @@ class String
   #
   # See also BigDecimal::new.
   #
+  def to_d
+    begin
+      BigDecimal(self)
+    rescue ArgumentError
+      BigDecimal(0)
+    end
+  end
 end
 
 
@@ -127,20 +132,3 @@ class Rational < Numeric
     BigDecimal(self, precision)
   end
 end
-
-
-class NilClass
-  # call-seq:
-  #     nil.to_d -> bigdecimal
-  #
-  # Returns nil represented as a BigDecimal.
-  #
-  #     require 'bigdecimal'
-  #     require 'bigdecimal/util'
-  #
-  #     nil.to_d   # => 0.0
-  #
-  def to_d
-    BigDecimal(0)
-  end
-end