ngoto	2018-06-05 23:16:50 +0900 (Tue, 05 Jun 2018)

  New Revision: 63572

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=63572

  Log:
    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 files:
    trunk/include/ruby/missing.h
Index: include/ruby/missing.h
===================================================================
--- include/ruby/missing.h	(revision 63571)
+++ include/ruby/missing.h	(revision 63572)
@@ -168,7 +168,7 @@ RUBY_EXTERN const union bytesequence4_or https://github.com/ruby/ruby/blob/trunk/include/ruby/missing.h#L168
 #    include <ieeefp.h>
 #    endif
 #  define isinf(x) (!finite(x) && !isnan(x))
-#  elif __cplusplus >= 201103L
+#  elif defined(__cplusplus) && __cplusplus >= 201103L
 #    include <cmath> // it must include constexpr bool isinf(double);
 #  else
 RUBY_EXTERN int isinf(double);
@@ -178,7 +178,7 @@ RUBY_EXTERN int isinf(double); https://github.com/ruby/ruby/blob/trunk/include/ruby/missing.h#L178
 
 #ifndef isnan
 # ifndef HAVE_ISNAN
-#  if __cplusplus >= 201103L
+#  if defined(__cplusplus) && __cplusplus >= 201103L
 #    include <cmath> // it must include constexpr bool isnan(double);
 #  else
 RUBY_EXTERN int isnan(double);

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