From 804a401a6e6726de6c24f54c3984358f7c07f14d Mon Sep 17 00:00:00 2001
From: David Hebbeker <dhebbeker@users.noreply.github.com>
Date: Thu, 29 Sep 2022 09:20:54 +0200
Subject: [PATCH] Automatically detect native endianness for IAR compiler
 platform. (#612)
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* Auto detect native endianness for IAR compiler platform.

References:

- [IAR C/C++ Development Guide Compiling and Linking for Arm Limited’s **Arm**® Cores](https://wwwfiles.iar.com/arm/webic/doc/ewarm_developmentguide.enu.pdf)
- [IAR C/C++ Compiler User Guide for Microchip Technology’s **AVR** Microcontroller Family](https://wwwfiles.iar.com/AVR/webic/doc/EWAVR_CompilerGuide.pdf)

* Fix spelling mistake.
---
 include/etl/endianness.h | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/include/etl/endianness.h b/include/etl/endianness.h
index 1b758bea..ecb1dde6 100644
--- a/include/etl/endianness.h
+++ b/include/etl/endianness.h
@@ -42,9 +42,17 @@ SOFTWARE.
 #endif
 
 ///\defgroup endian endian
-/// Constants & utilities for endianess
+/// Constants & utilities for endianness
 ///\ingroup utilities
 
+#if !defined(ETL_ENDIAN_NATIVE) && defined(__IAR_SYSTEMS_ICC__) && defined(__LITTLE_ENDIAN__)
+  #if __LITTLE_ENDIAN__ == 1
+    #define ETL_ENDIAN_NATIVE 0
+  #elif __LITTLE_ENDIAN__ == 0
+    #define ETL_ENDIAN_NATIVE 1
+  #endif
+#endif
+
 // Have we not already defined ETL_ENDIAN_NATIVE?
 #if !defined(ETL_ENDIAN_NATIVE)
   // Can we use the C++20 definitions?