https://git.ruby-lang.org/ruby.git/commit/?id=5aa28d9d6d

From 5aa28d9d6d8d070a4f29905f3a2c76b0f000ed44 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sat, 2 Jan 2021 09:48:42 +0900
Subject: Check if x86intrin.h is available not only existing


diff --git a/ext/bigdecimal/extconf.rb b/ext/bigdecimal/extconf.rb
index ab856b8..4ad5172 100644
--- a/ext/bigdecimal/extconf.rb
+++ b/ext/bigdecimal/extconf.rb
@@ -46,7 +46,9 @@ have_builtin_func("__builtin_clz", "__builtin_clz(0)") https://github.com/ruby/ruby/blob/trunk/ext/bigdecimal/extconf.rb#L46
 have_builtin_func("__builtin_clzl", "__builtin_clzl(0)")
 
 have_header("stdbool.h")
-have_header("x86intrin.h")
+if have_func("_lzcnt_u64", "x86intrin.h") # check availability
+  $defs << "-DHAVE_X86INTRIN_H"
+end
 
 have_func("labs", "stdlib.h")
 have_func("llabs", "stdlib.h")
-- 
cgit v0.10.2


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