From 8b404ade3eb376ef0619a039396823f7e2e462e0 Mon Sep 17 00:00:00 2001
From: Martin Braun <martin.braun@ettus.com>
Date: Fri, 15 Feb 2019 16:52:55 -0800
Subject: docs: Add note on manually disabling NEON extensions

---
 host/docs/build.dox | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/host/docs/build.dox b/host/docs/build.dox
index 9a6beba20..b5e9caaf5 100644
--- a/host/docs/build.dox
+++ b/host/docs/build.dox
@@ -170,6 +170,17 @@ or add it to `/etc/ld.so.conf` and make sure to run:
 
     sudo ldconfig
 
+\subsection build_instructions_unix_arm Compiling for ARM platforms
+
+When compiling for ARM platforms, the assumption is made that NEON extensions
+are available if the arm_neon.h header is found. However, this might not be
+true, e.g., when cross-compiling for an arm7l target (e.g., the Odroid XU4)
+using a standard SDK. In this case, it's necessary to tell CMake to disable NEON
+extensions:
+
+    cmake -DNEON_SIMD_ENABLE=OFF [...]
+
+
 \section build_instructions_windows Build Instructions (Windows)
 
 \subsection cmake_win Generate the project with CMake
-- 
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