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merge revision(s) 63571,63572: [Backport #14816]

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`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
This commit is contained in:
nagachika 2018-08-18 04:18:32 +00:00
parent f5a90a2d97
commit 99d1f2c5dc
2 changed files with 7 additions and 1 deletions
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6
include/ruby/missing.h
View file

@ -162,6 +162,8 @@ RUBY_EXTERN const union bytesequence4_or_float rb_nan;
# include <ieeefp.h>
# endif
# define isinf(x) (!finite(x) && !isnan(x))
# elif defined(__cplusplus) && __cplusplus >= 201103L
# include <cmath> // it must include constexpr bool isinf(double);
# else
RUBY_EXTERN int isinf(double);
# endif
@ -170,7 +172,11 @@ RUBY_EXTERN int isinf(double);
#ifndef isnan
# ifndef HAVE_ISNAN
# if defined(__cplusplus) && __cplusplus >= 201103L
# include <cmath> // it must include constexpr bool isnan(double);
# else
RUBY_EXTERN int isnan(double);
# endif
# endif
#endif

2
version.h
View file

@ -1,6 +1,6 @@
#define RUBY_VERSION "2.5.2"
#define RUBY_RELEASE_DATE "2018-08-18"
#define RUBY_PATCHLEVEL 76
#define RUBY_PATCHLEVEL 77
#define RUBY_RELEASE_YEAR 2018
#define RUBY_RELEASE_MONTH 8