`int isnan(double)` is a POSIXism

	- `isnan` is something relatively new.  We need to provide one for
	  those systems without it.  However:
	- X/Open defines `int isnan(double)`. Note the `int`.
	- C99 defines `isnan(x)` to be a macro.
	- C++11 nukes them all, undefines all the "masking macro"s, and
	  defines its own `bool isnan(double)`.  Note the `bool`.
	- In C++, `int isnan(double)` and `bool isnan(double)` are
	  incompatible.
	- So the mess.

	[Bug #14816][ruby-core:87364]
	further reading: https://developers.redhat.com/blog/2016/02/29/why-cstdlib-is-more-complicated-than-you-might-think/


	include/ruby/missing.h: defined(__cplusplus) before using __cplusplus

	* include/ruby/missing.h (isinf, isnan): For non-C++ programs,
	  defined(__cplusplus) may be needed before using __cplusplus.
	  [Bug #14816]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_5@64434 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

	ruby.h: relax rb_funcall check on extra args for clang

	clang 5.+ (tested clang 7.0.0) seems to be attempting division-by-zero
	and giving a very large number for static args to rb_funcall.

	* include/ruby/ruby.h (rb_varargs_bad_length): relax check for clang
	* ext/-test-/funcall/funcall.c: renamed from passing_block.c
	  define extra_args_name function
	* test/-ext-/funcall/test_funcall.rb: new test
	  [ruby-core:85266] [Bug #14425]

	From: Eric Wong <e@80x24.org>

	ruby.h: relax rb_funcall(obj, id, 0, 0) case only

	* include/ruby/ruby.h (rb_varargs_argc_valid_p): relax rb_funcall
	  check on extra args only if argc == 0, for the compatibility
	  with wrong code which is probably confused with rb_funcallv.
	  [Bug #14425]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_5@62501 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

GCC 4.8 with optimization causes error if it compiles following code.
[Bug #14221]

```c
__builtin_choose_expr(__builtin_constant_p(b),0,1)
```

https://github.com/ruby/ruby/pull/1778

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61429 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

* include/ruby/ruby.h (RB_ST2FIX): force fixable on LLP64 environment.

* hash.c (any_hash): ditto.
  [ruby-core:84395] [Bug #14218]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61413 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

2.5's line coverage measurement was about two times slower than 2.4
because of two reasons; (1) vm_trace uses rb_iseq_event_flags (which
takes O(n) currently where n is the length of iseq) to get an event
type, and (2) RUBY_EVENT_LINE uses setjmp to call an event hook.

This change adds a special event for line coverage,
RUBY_EVENT_COVERAGE_LINE, and adds `tracecoverage` instructions where
the event occurs in iseq.
`tracecoverage` instruction calls an event hook without vm_trace.
And, RUBY_EVENT_COVERAGE_LINE is an internal event which does not
use setjmp.

This change also cancells lineno change due to the deletion of trace
instructions [Feature #14104].  So fixes [Bug #14191].

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61350 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61323 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

FrozenError will be used instead of RuntimeError for exceptions
raised when there is an attempt to modify a frozen object. The
reason for this change is to differentiate exceptions related
to frozen objects from generic exceptions such as those generated
by Kernel#raise without an exception class.

From: Jeremy Evans <code@jeremyevans.net>
Signed-off-by: Urabe Shyouhei <shyouhei@ruby-lang.org>


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61131 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

trying to solve build problem of MinGW.  see [Bug #14165]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61119 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61116 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

* win32/win32.c, include/ruby/win32.h (stati128, rb_{,u,l,ul}stati128): rename
  from stati64ns, change the type of st_ino to 64bit and added st_inohigh.

* dir.c, file.c (stat, lstat): follow above changes.

* file.c (rb_stat_ino): support 128bit ino.

* win32/win32.c (rb_{,u,l,ul}stati128): ditto.
  [Feature #13731]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61096 b2dd03c8-39d4-4d8f-98ff-823fe69b080e