From 8184adabe5018ff930fde64456029471c1ebcd2e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=8D=9C=E9=83=A8=E6=98=8C=E5=B9=B3?=
 <shyouhei@ruby-lang.org>
Date: Wed, 25 Dec 2019 13:40:10 +0900
Subject: internal/stdbool.h rework

Noticed that internal/stdbool.h and addr2line.c are the only two place
where missing/stdbool.h is included.  Why not delete the file so that
we can merge internal/stdbool.h and missing/stdbool.h into one.
---
 addr2line.c        |  6 +-----
 internal/stdbool.h | 16 +++++++++++++++-
 missing/stdbool.h  | 20 --------------------
 3 files changed, 16 insertions(+), 26 deletions(-)
 delete mode 100644 missing/stdbool.h

diff --git a/addr2line.c b/addr2line.c
index 635194b96b..c6704858a9 100644
--- a/addr2line.c
+++ b/addr2line.c
@@ -25,11 +25,7 @@
 #include <libproc.h>
 #endif
 
-#ifdef HAVE_STDBOOL_H
-#include <stdbool.h>
-#else
-#include "missing/stdbool.h"
-#endif
+#include "internal/stdbool.h"
 
 #if defined(USE_ELF) || defined(HAVE_MACH_O_LOADER_H)
 
diff --git a/internal/stdbool.h b/internal/stdbool.h
index 4c103b43ce..e090e575e7 100644
--- a/internal/stdbool.h
+++ b/internal/stdbool.h
@@ -13,8 +13,22 @@
 
 #ifdef HAVE_STDBOOL_H
 # include <stdbool.h>
+#endif
+
+/* Note that we assume the compiler isn't C++. */
+#ifdef __bool_true_false_are_defined
+# undef bool
+# undef true
+# undef false
+# undef __bool_true_false_are_defined
 #else
-# include "missing/stdbool.h"
+typedef unsigned char _Bool;
 #endif
 
+/* See also http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2229.htm */
+#define bool  _Bool
+#define true  ((_Bool)+1)
+#define false ((_Bool)+0)
+#define __bool_true_false_are_defined
+
 #endif /* INTERNAL_STDBOOL_H */
diff --git a/missing/stdbool.h b/missing/stdbool.h
deleted file mode 100644
index f370e01e92..0000000000
--- a/missing/stdbool.h
+++ /dev/null
@@ -1,20 +0,0 @@
-/*
- * missing/stdbool.h: Quick alternative of C99 stdbool.h
- */
-
-#ifndef _MISSING_STDBOOL_H_
-#define _MISSING_STDBOOL_H_
-
-#ifndef __bool_true_false_are_defined
-# ifndef __cplusplus
-#  undef bool
-#  undef false
-#  undef true
-#  define bool signed char
-#  define false 0
-#  define true 1
-#  define __bool_true_false_are_defined 1
-# endif
-#endif
-
-#endif /* _MISSING_STDBOOL_H_ */
-- 
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