From 5f6ee7f30f13ecded4847776a66f912a59116a6e Mon Sep 17 00:00:00 2001
From: ridiculousfish <corydoras@ridiculousfish.com>
Date: Sat, 14 Sep 2019 15:07:48 -0700
Subject: [PATCH] Use the gold linker if available

The big reason to do this is that the gold linker doesn't complain about
_sys_nerr and _sys_errlist.
---
 CMakeLists.txt | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 475b00741..73ca4a860 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -47,6 +47,15 @@ set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra \
 # Disable exception handling.
 ADD_COMPILE_OPTIONS(-fno-exceptions)
 
+# Prefer the gold linker because it doesn't emit useless warnings about sys_nerr and _sys_errlist.
+if (UNIX AND NOT APPLE)
+  EXECUTE_PROCESS(COMMAND ${CMAKE_C_COMPILER} -fuse-ld=gold -Wl,--version
+                  ERROR_QUIET OUTPUT_VARIABLE LD_VERSION)
+  if ("${LD_VERSION}" MATCHES "GNU gold")
+    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -fuse-ld=gold")
+  endif()
+endif()
+
 # Hide the CMake Rules directories in Xcode projects.
 SOURCE_GROUP("CMake Rules" REGULAR_EXPRESSION "^$")