Support C89 if possible

* addr2line.c: Because stdbool.h is a C99 feature, compile error
  occurs with some old compilers without specifying C99 options.
  Fix compile error with Oracle Solaris Studio 12.4 on Solaris 10.
  [Bug #14200] [ruby-dev:50366]

* missing/stdbool.h: Alternative of stdbool.h for C89 compilers.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61326 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

addr2line.c

@@ -13,9 +13,14 @@
 #include "addr2line.h"
 
 #include <stdio.h>
-#include <stdbool.h>
 #include <errno.h>
 
+#ifdef HAVE_STDBOOL_H
+#include <stdbool.h>
+#else
+#include "missing/stdbool.h"
+#endif
+
 #ifdef USE_ELF
 
 #include <fcntl.h>

missing/stdbool.h

@@ -0,0 +1,20 @@
+/*
+ * missing/stdbool.h: Quick alternative of C99 stdbool.h
+ */
+
+#ifndef _MISSING_STDBOOL_H_
+#define _MISSING_STDBOOL_H_
+
+#ifndef __cplusplus
+
+#define bool _Bool
+#define true 1
+#define false 0
+
+#ifndef HAVE__BOOL /* AC_HEADER_STDBOOL in configure.ac */
+typedef int _Bool;
+#endif /* HAVE__BOOL */
+
+#endif /* __cplusplus */
+
+#endif /* _MISSING_STDBOOL_H_ */