From fa7ab41c1b60d656e2674a8d432eefffb53a849e Mon Sep 17 00:00:00 2001
From: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>
Date: Wed, 20 Sep 2023 12:35:15 +0200
Subject: [PATCH] native_simulator: Be sure the symbol_to_keep section is kept

The native simulator final link can garbage collect unused
symbols. So let's ensure the symbol to keep ones are indeed
kept even if not used.

Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>
---
 boards/posix/common/natsim_config.cmake     |  3 +++
 boards/posix/common/natsim_linker_script.ld | 22 +++++++++++++++++++++
 2 files changed, 25 insertions(+)
 create mode 100644 boards/posix/common/natsim_linker_script.ld

diff --git a/boards/posix/common/natsim_config.cmake b/boards/posix/common/natsim_config.cmake
index 54f26aef3ef..30da901f535 100644
--- a/boards/posix/common/natsim_config.cmake
+++ b/boards/posix/common/natsim_config.cmake
@@ -4,6 +4,9 @@
 set(zephyr_build_path ${CMAKE_BINARY_DIR}/zephyr)
 get_property(CCACHE GLOBAL PROPERTY RULE_LAUNCH_COMPILE)
 
+target_link_options(native_simulator INTERFACE
+  "-T ${ZEPHYR_BASE}/boards/posix/common/natsim_linker_script.ld")
+
 set(nsi_config_content
   ${nsi_config_content}
   "NSI_BUILD_OPTIONS:=$<JOIN:$<TARGET_PROPERTY:native_simulator,INTERFACE_COMPILE_OPTIONS>,\ >"
diff --git a/boards/posix/common/natsim_linker_script.ld b/boards/posix/common/natsim_linker_script.ld
new file mode 100644
index 00000000000..add80b86c75
--- /dev/null
+++ b/boards/posix/common/natsim_linker_script.ld
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2023 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * @file
+ * @brief Extra linker command/script file for the native simulator runner
+ */
+
+SECTIONS
+ {
+	symbol_to_keep :
+	{
+		KEEP(*(symbol_to_keep*));
+	}
+ } INSERT AFTER .data;
+
+/*
+ * Note this script augments the default native simulator linker script
+ */