From bac8fa5f9db55f8f7a9100fcb0e9cc43846442f0 Mon Sep 17 00:00:00 2001 From: akr Date: Tue, 23 Apr 2013 11:27:07 +0000 Subject: * missing/isnan.c (isnan): Don't define if isnan() macro is defined. 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 --- ChangeLog | 5 +++++ missing/isnan.c | 15 +++++++++++++++ 2 files changed, 20 insertions(+) diff --git a/ChangeLog b/ChangeLog index b9a89469cb..4a756a8ec7 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,8 @@ +Tue Apr 23 20:10:02 2013 Tanaka Akira + + * missing/isnan.c (isnan): Don't define if isnan() macro is defined. + This fixes a compilation failure on uClibc based Gentoo system. + Tue Apr 23 17:40:40 2013 Martin Duerst * lib/rexml/document.rb, lib/rexml/element.rb, diff --git a/missing/isnan.c b/missing/isnan.c index 5846947f50..ed10bf5cd6 100644 --- a/missing/isnan.c +++ b/missing/isnan.c @@ -2,6 +2,20 @@ #include "ruby/missing.h" +/* + * isnan() may be a macro, a function or both. + * (The C99 standard defines that isnan() is a macro, though.) + * http://www.gnu.org/software/automake/manual/autoconf/Function-Portability.html + * + * macro only: uClibc + * both: GNU libc + * + * This file is compile if no isnan() function is available. + * (autoconf AC_REPLACE_FUNCS detects only the function.) + * The macro is detected by following #ifndef. + */ + +#ifndef isnan static int double_ne(double n1, double n2); int @@ -15,3 +29,4 @@ double_ne(double n1, double n2) { return n1 != n2; } +#endif -- cgit v1.2.3