From d87171a2f19ef4ea0b6f75ab02e3896e65e39376 Mon Sep 17 00:00:00 2001
From: Sudeep Mohanty <sudeep.mohanty@espressif.com>
Date: Wed, 14 Aug 2024 14:56:42 +0200
Subject: [PATCH] fix(cmake): Fixed linker not supporting -warn_commons for
 linux target on MacOS

This commit updates the ld linker flags to conditionally include the
-warn_commons flag when the linux target is built on MacOS. This is
because, not all versions of ld support the -warn_commons option.

Closes https://github.com/espressif/esp-idf/issues/13185
---
 CMakeLists.txt | 29 ++++++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5869c4c1e4..f85ac1cda5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -198,8 +198,35 @@ endif()
 list(APPEND link_options "-fno-lto")
 
 if(CONFIG_IDF_TARGET_LINUX AND CMAKE_HOST_SYSTEM_NAME STREQUAL "Darwin")
+    # Not all versions of the MacOS linker support the -warn_commons flag.
+    # ld version 1053.12 (and above) have been tested to support it.
+    # Hence, we extract the version string from the linker output
+    # before including the flag.
+
+    # Get the ld version, capturing both stdout and stderr
+    execute_process(
+        COMMAND ${CMAKE_LINKER} -v
+        OUTPUT_VARIABLE LD_VERSION_OUTPUT
+        ERROR_VARIABLE LD_VERSION_ERROR
+        OUTPUT_STRIP_TRAILING_WHITESPACE
+        ERROR_STRIP_TRAILING_WHITESPACE
+    )
+
+    # Combine stdout and stderr
+    set(LD_VERSION_OUTPUT "${LD_VERSION_OUTPUT}\n${LD_VERSION_ERROR}")
+
+    # Extract the version string
+    string(REGEX MATCH "PROJECT:(ld|dyld)-([0-9]+)\\.([0-9]+)" LD_VERSION_MATCH "${LD_VERSION_OUTPUT}")
+    set(LD_VERSION_MAJOR_MINOR "${CMAKE_MATCH_2}.${CMAKE_MATCH_3}")
+
+    message(STATUS "Linker Version: ${LD_VERSION_MAJOR_MINOR}")
+
+    # Compare the version with 1053.12
+    if(LD_VERSION_MAJOR_MINOR VERSION_GREATER_EQUAL "1053.12")
+        list(APPEND link_options "-Wl,-warn_commons")
+    endif()
+
     list(APPEND link_options "-Wl,-dead_strip")
-    list(APPEND link_options "-Wl,-warn_commons")
 else()
     list(APPEND link_options "-Wl,--gc-sections")
     list(APPEND link_options "-Wl,--warn-common")