From ecbe5be43968de534a6587499ef370a169c36c94 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Tue, 1 Dec 2015 01:05:48 +0000
Subject: configure.in: FUNC_UNOPTIMIZED

* configure.in: check if optimize pragma is supported.

* include/ruby/defines.h (FUNC_UNOPTIMIZED): fallback definition.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52823 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 configure.in             | 1 +
 include/ruby/defines.h   | 3 +++
 missing/explicit_bzero.c | 6 ++++--
 3 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/configure.in b/configure.in
index 916d93a1b8..2f8d4af02e 100644
--- a/configure.in
+++ b/configure.in
@@ -1757,6 +1757,7 @@ if_i386=${universal_binary+[defined __i386__]}
 RUBY_FUNC_ATTRIBUTE(stdcall,  [], [], ${if_i386})
 RUBY_FUNC_ATTRIBUTE(cdecl,    [], [], ${if_i386})
 RUBY_FUNC_ATTRIBUTE(fastcall, [], [], ${if_i386})
+RUBY_FUNC_ATTRIBUTE(optimize("O0"), FUNC_UNOPTIMIZED, rb_cv_func_unoptimized)
 RUBY_FUNC_ATTRIBUTE(optimize("-Os","-fomit-frame-pointer"), FUNC_MINIMIZED, rb_cv_func_minimized)
 
 if test "$GCC" = yes; then
diff --git a/include/ruby/defines.h b/include/ruby/defines.h
index 54a56ff9e6..b4d75294d4 100644
--- a/include/ruby/defines.h
+++ b/include/ruby/defines.h
@@ -244,6 +244,9 @@ void rb_ia64_flushrs(void);
 #ifndef FUNC_MINIMIZED
 #define FUNC_MINIMIZED(x) x
 #endif
+#ifndef FUNC_UNOPTIMIZED
+#define FUNC_UNOPTIMIZED(x) x
+#endif
 #ifndef RUBY_ALIAS_FUNCTION_TYPE
 #define RUBY_ALIAS_FUNCTION_TYPE(type, prot, name, args) \
     FUNC_MINIMIZED(type prot) {return (type)name args;}
diff --git a/missing/explicit_bzero.c b/missing/explicit_bzero.c
index c89bdbc0a8..e7bb11e69f 100644
--- a/missing/explicit_bzero.c
+++ b/missing/explicit_bzero.c
@@ -12,13 +12,15 @@
  * http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1381.pdf
  */
 
-#ifdef __GNUC__
-#pragma GCC optimize ("O0")
+#ifndef FUNC_UNOPTIMIZED
+# define FUNC_UNOPTIMIZED(x) x
 #endif
 
 #ifndef HAVE_EXPLICIT_BZERO
 /* Similar to bzero(), but have a guarantee not to be eliminated from compiler
    optimization. */
+FUNC_UNOPTIMIZED(void explicit_bzero(void *b, size_t len));
+
 void
 explicit_bzero(void *b, size_t len)
 {
-- 
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