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bac8fa5f9d
This fixes a compilation failure on uClibc based Gentoo system. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40422 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
32 lines
667 B
C
32 lines
667 B
C
/* public domain rewrite of isnan(3) */
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#include "ruby/missing.h"
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/*
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* isnan() may be a macro, a function or both.
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* (The C99 standard defines that isnan() is a macro, though.)
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* http://www.gnu.org/software/automake/manual/autoconf/Function-Portability.html
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*
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* macro only: uClibc
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* both: GNU libc
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*
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* This file is compile if no isnan() function is available.
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* (autoconf AC_REPLACE_FUNCS detects only the function.)
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* The macro is detected by following #ifndef.
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*/
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#ifndef isnan
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static int double_ne(double n1, double n2);
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int
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isnan(double n)
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{
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return double_ne(n, n);
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}
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static int
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double_ne(double n1, double n2)
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{
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return n1 != n2;
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}
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#endif
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