Fix error with empty args.

* ext/pathname/lib/pathname.rb (Pathname#join): Fix error with
  empty args. Reported by ko1 via IRC.

* test/pathname/test_pathname.rb (TestPathname#test_join): Add the
  test for above case.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45499 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2014-04-02

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45500 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* doc/syntax/assignment.rdoc: [DOC] Fix typo unclosed HTML tag by @andrewdotn
  [fix GH-574][ci skip]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45501 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* common.mk: Use redmine-2.x url for DeveloperHowto wiki.
  [ruby-core:60657] [Bug #9511]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45502 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
configure.in: do not use a variable for longjmp

* configure.in (ac_cv_func___builtin_setjmp): gcc 4.9 disallows a
  variable as the second argument of __builtin_longjmp().
  [ruby-core:61800] [Bug #9692]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45503 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
eval_intern.h: __builtin_longjmp requires literal 1 on gcc 4.9

* eval_intern.h (rb_threadptr_tag_jump): gcc 4.9 disallows other than
  literal 1 as the second argument of __builtin_longjmp().
  [ruby-core:61800] [Bug #9692]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45504 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* gc.c, gc.h (rb_objspace_each_objects_without_setup):
  Add a new (hidden) C-API to iterate objspace snapshot.
  This API is not safe to call any C-APIs in a given callback
  function. Be careful to use this C-API.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45505 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* remove trailing spaces.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45506 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* properties.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45507 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
configure.in: fix for clang 5.1 __builtin_longjmp

* configure.in (ac_cv_func___builtin_setjmp): __builtin_longjmp() in
  clang 5.1 uses `void**`, not `jmp_buf`.  [Bug #9692]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45508 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
configure.in: use the first candidate

* configure.in (ac_cv_func___builtin_setjmp): use the first cast
  which works with __builtin_longjmp().  [Bug #9692]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45509 b2dd03c8-39d4-4d8f-98ff-823fe69b080e