bigdecimal: dependency

* ext/bigdecimal/extconf.rb: extconf.h depends on the gemspec
  file.  [ruby-core:84247] [Bug #14180]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61221 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 9 insertions, 7 deletions

diff --git a/ext/bigdecimal/extconf.rb b/ext/bigdecimal/extconf.rb
index 4bef91eafe..e565da891a 100644
--- a/ext/bigdecimal/extconf.rb
+++ b/ext/bigdecimal/extconf.rb
@@ -1,12 +1,12 @@
 # frozen_string_literal: false
 require 'mkmf'
 
-case
-when File.file?(File.expand_path('../bigdecimal.gemspec', __FILE__))
-  gemspec_path = File.expand_path('../bigdecimal.gemspec', __FILE__)
-when File.file?(File.expand_path('../../../bigdecimal.gemspec', __FILE__))
-  gemspec_path = File.expand_path('../../../bigdecimal.gemspec', __FILE__)
-else
+gemspec_name = gemspec_path = nil
+unless ['', '../../'].any? {|dir|
+         gemspec_name = "#{dir}bigdecimal.gemspec"
+         gemspec_path = File.expand_path("../#{gemspec_name}", __FILE__)
+         File.file?(gemspec_path)
+       }
   $stderr.puts "Unable to find bigdecimal.gemspec"
   abort
 end
@@ -30,4 +30,6 @@ have_func("rb_rational_den", "ruby.h")
 have_func("rb_array_const_ptr", "ruby.h")
 have_func("rb_sym2str", "ruby.h")
 
-create_makefile('bigdecimal')
+create_makefile('bigdecimal') {|mf|
+  mf << "\nall:\n\nextconf.h: $(srcdir)/#{gemspec_name}\n"
+}