diff --git a/Makefile b/Makefile
index 840bde1..f70ef17 100644
--- a/Makefile
+++ b/Makefile
@@ -608,6 +608,16 @@
   CC_FLAGS_FTRACE := -pg
 endif
 
+# Make toolchain changes before including arch/$(SRCARCH)/Makefile to ensure
+# ar/cc/ld-* macros return correct values.
+ifdef CONFIG_LTO_CLANG
+# use llvm-ar for building symbol tables from IR files, and llvm-nm instead
+# of objdump for processing symbol versions and exports
+LLVM_AR		:= llvm-ar
+LLVM_NM		:= llvm-nm
+export LLVM_AR LLVM_NM
+endif
+
 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
 # values of the respective KBUILD_* variables
 ARCH_CPPFLAGS :=
@@ -795,6 +805,22 @@
 LDFLAGS_vmlinux += --gc-sections
 endif
 
+ifdef CONFIG_LTO_CLANG
+lto-clang-flags	:= -flto -fvisibility=hidden
+
+# allow disabling only clang LTO where needed
+DISABLE_LTO_CLANG := -fno-lto -fvisibility=default
+export DISABLE_LTO_CLANG
+endif
+
+ifdef CONFIG_LTO
+LTO_CFLAGS	:= $(lto-clang-flags)
+KBUILD_CFLAGS	+= $(LTO_CFLAGS)
+
+DISABLE_LTO	:= $(DISABLE_LTO_CLANG)
+export LTO_CFLAGS DISABLE_LTO
+endif
+
 # arch Makefile may override CC so keep this after arch Makefile is included
 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
 
@@ -1583,7 +1609,8 @@
 		-o -name modules.builtin -o -name '.tmp_*.o.*' \
 		-o -name '*.c.[012]*.*' \
 		-o -name '*.ll' \
-		-o -name '*.gcno' \) -type f -print | xargs rm -f
+		-o -name '*.gcno' \
+		-o -name '*.*.symversions' \) -type f -print | xargs rm -f
 
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