From af10d16a087b4264e55f39696b495ef45f135261 Mon Sep 17 00:00:00 2001
From: Daniel Leung <daniel.leung@intel.com>
Date: Sat, 9 Mar 2019 00:58:57 -0800
Subject: [PATCH] linker: sort sections by alignment

This turns on the linker flag to sort sections by alignment
in decreasing size of symbols. This helps to minimize
padding between symbols.

This also adds the linker options to sort common symbols by
alignment in descending to minimize the need for padding.

Signed-off-by: Daniel Leung <daniel.leung@intel.com>
---
 CMakeLists.txt | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4e04694a38b..3ab4ef394cc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -384,6 +384,13 @@ zephyr_ld_options(
   ${LINKERFLAGPREFIX},--build-id=none
   )
 
+# Sort the common symbols and each input section by alignment
+# in descending order to minimize padding between these symbols.
+zephyr_ld_options(
+  ${LINKERFLAGPREFIX},--sort-common=descending
+  ${LINKERFLAGPREFIX},--sort-section=alignment
+  )
+
 get_property(TOPT GLOBAL PROPERTY TOPT)
 set_ifndef(  TOPT -T)