kernel-inline-lld-gcc-support.patch

From 33c6a4b53675e72cac7bbc26582a8be4c1fdf7c5 Mon Sep 17 00:00:00 2001
From: Vaisakh Murali <[email protected]>
Date: Thu, 31 Dec 2020 23:08:02 +0530
Subject: [PATCH] kernel: Add support for usage of inline LLD with GCC Cross
 Compilers

* LLD has shown to be much faster than the GCC Standard BFD ld and Gold ld.
* With newer android kernels, usage of these GCC Standard linkers becomes difficult as they
  don't support relative relocations.
* LLD supports such relocations, being a modern linker and with the amazing linking speed, it
  is a useful addition to GCC.
* This patch is for LLD integrated into GCC Cross Compiler
---
 Makefile                    | 4 ++++
 scripts/gcc-plugins/Kconfig | 5 +++++
 2 files changed, 9 insertions(+)

diff --git a/Makefile b/Makefile
index 1bf6734cc3d2..05ba67f069cb 100644
--- a/Makefile
+++ b/Makefile
@@ -392,7 +392,11 @@ KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
 
 # Make variables (CC, etc...)
 AS		= $(CROSS_COMPILE)as
+ifeq ($(CONFIG_GCC_LLD),y)
+LD		= $(CROSS_COMPILE)ld.lld
+else
 LD		= $(CROSS_COMPILE)ld
+endif
 REAL_CC		= $(CROSS_COMPILE)gcc
 CPP		= $(CC) -E
 AR		= $(CROSS_COMPILE)ar
diff --git a/scripts/gcc-plugins/Kconfig b/scripts/gcc-plugins/Kconfig
index 21f4b68eb273..d018b2368ba4 100644
--- a/scripts/gcc-plugins/Kconfig
+++ b/scripts/gcc-plugins/Kconfig
@@ -13,6 +13,11 @@ config HAVE_GCC_PLUGINS
 	  An arch should select this symbol if it supports building with
 	  GCC plugins.
 
+config GCC_LLD
+	bool
+	help
+	  Allow the usage of LLVM LLD linker with GCC.
+
 config GCC_PLUGINS
 	bool
 	depends on HAVE_GCC_PLUGINS
-- 
2.29.2