From 9901fc3058fbdba2443c9634a24586c3f506dbda Mon Sep 17 00:00:00 2001
From: Ivan Grokhotkov <ivan@espressif.com>
Date: Tue, 16 Nov 2021 00:04:36 +0100
Subject: [PATCH] cmake: don't pass --gc-sections to macOS linker, use
 -dead_strip

When building for "linux" (~POSIX) target on macOS, the system linker
is normally used. MacOS linker doesn't recognise --gc-sections, but
has a -dead_strip flag which is equivalent.
---
 CMakeLists.txt          | 6 ++++++
 tools/cmake/build.cmake | 3 ---
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0b86ac6027..ec4e2bcc66 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -196,6 +196,12 @@ endif()
 
 list(APPEND link_options "-fno-lto")
 
+if(CONFIG_IDF_TARGET_LINUX AND CMAKE_HOST_SYSTEM_NAME STREQUAL "Darwin")
+    list(APPEND link_options "-Wl,-dead_strip")
+else()
+    list(APPEND link_options "-Wl,--gc-sections")
+endif()
+
 # Placing jump tables in flash would cause issues with code that required
 # to be placed in IRAM
 list(APPEND compile_options "-fno-jump-tables")
diff --git a/tools/cmake/build.cmake b/tools/cmake/build.cmake
index 78b95f8d45..51fd0d40c4 100644
--- a/tools/cmake/build.cmake
+++ b/tools/cmake/build.cmake
@@ -111,13 +111,10 @@ function(__build_set_default_build_specifications)
 
     list(APPEND cxx_compile_options "-std=gnu++11")
 
-    list(APPEND link_options "-Wl,--gc-sections")
-
     idf_build_set_property(COMPILE_DEFINITIONS "${compile_definitions}" APPEND)
     idf_build_set_property(COMPILE_OPTIONS "${compile_options}" APPEND)
     idf_build_set_property(C_COMPILE_OPTIONS "${c_compile_options}" APPEND)
     idf_build_set_property(CXX_COMPILE_OPTIONS "${cxx_compile_options}" APPEND)
-    idf_build_set_property(LINK_OPTIONS "${link_options}" APPEND)
 endfunction()
 
 #