From 086283ed7f1886de05407bc75dd4c070c78a6f50 Mon Sep 17 00:00:00 2001
From: Lothar Felten <lothar.felten@gmail.com>
Date: Mon, 8 Oct 2018 13:29:44 +0200
Subject: [PATCH] Fix include guards for older kernel/u-boot sources

Linux kernels before 4.17 and U-Boot versions before 2018.07 use libfdt
include guards with leading underscores.

Those have been removed in dtc-1.4.7.

This patch handles both include guard types and allows the compilation
of older Linux kernel and u-boot sources.

Signed-off-by: Lothar Felten <lothar.felten@gmail.com>
[ThomasDS: also update fdt.h which has the same issue, seen on U-Boot
2011.03]
Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
---
 libfdt/fdt.h        | 4 ++++
 libfdt/libfdt.h     | 4 ++++
 libfdt/libfdt_env.h | 4 ++++
 3 files changed, 12 insertions(+)

diff --git a/libfdt/fdt.h b/libfdt/fdt.h
index 74961f9..2904f48 100644
--- a/libfdt/fdt.h
+++ b/libfdt/fdt.h
@@ -1,3 +1,7 @@
+#ifdef _FDT_H
+#warning "Please consider updating your kernel and/or u-boot version"
+#define FDT_H
+#endif
 #ifndef FDT_H
 #define FDT_H
 /*
diff --git a/libfdt/libfdt.h b/libfdt/libfdt.h
index 830b77e..bef4566 100644
--- a/libfdt/libfdt.h
+++ b/libfdt/libfdt.h
@@ -1,3 +1,7 @@
+#ifdef _LIBFDT_H
+#warning "Please consider updating your kernel and/or u-boot version"
+#define LIBFDT_H
+#endif
 #ifndef LIBFDT_H
 #define LIBFDT_H
 /*
diff --git a/libfdt/libfdt_env.h b/libfdt/libfdt_env.h
index eb20538..6a61e6a 100644
--- a/libfdt/libfdt_env.h
+++ b/libfdt/libfdt_env.h
@@ -1,3 +1,7 @@
+#ifdef _LIBFDT_ENV_H
+#warning "Please consider updating your kernel and/or u-boot version"
+#define LIBFDT_ENV_H
+#endif
 #ifndef LIBFDT_ENV_H
 #define LIBFDT_ENV_H
 /*
-- 
2.19.2