[ruby-cvs:71218] usa:r64126 (ruby_2_4): merge revision(s) 63571, 63572: [Backport #14816]

usa at ruby-lang.org usa at ruby-lang.org
Mon Jul 30 22:57:35 JST 2018


usa	2018-07-30 22:57:35 +0900 (Mon, 30 Jul 2018)

  New Revision: 64126

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=64126

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

  Modified directories:
    branches/ruby_2_4/
  Modified files:
    branches/ruby_2_4/include/ruby/missing.h
    branches/ruby_2_4/version.h


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