From f0ea0fe278c5b87d637be0cae0680b61c183e7bd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vin=C3=ADcius=20Tinti?= <viniciustinti@gmail.com>
Date: Mon, 24 Apr 2017 13:04:58 -0700
Subject: kbuild: Add support to generate LLVM assembly files
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commit 433db3e260bc8134d4a46ddf20b3668937e12556 upstream.

Add rules to kbuild in order to generate LLVM assembly files with the .ll
extension when using clang.

  # from c code
  make CC=clang kernel/pid.ll

Signed-off-by: Vinícius Tinti <viniciustinti@gmail.com>
Signed-off-by: Behan Webster <behanw@converseincode.com>
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
[nc: Fix conflicts due to lack of commit 6b90bd4ba40b3 in linux-4.4.y]
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 scripts/Makefile.build | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'scripts')

diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 18209917e379..42aef001dfdd 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -175,6 +175,14 @@ cmd_cc_symtypes_c =                                                         \
 $(obj)/%.symtypes : $(src)/%.c FORCE
 	$(call cmd,cc_symtypes_c)
 
+# LLVM assembly
+# Generate .ll files from .c
+quiet_cmd_cc_ll_c = CC $(quiet_modtag)  $@
+      cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $<
+
+$(obj)/%.ll: $(src)/%.c FORCE
+	$(call if_changed_dep,cc_ll_c)
+
 # C (.c) files
 # The C file is compiled and updated dependency information is generated.
 # (See cmd_cc_o_c + relevant part of rule_cc_o_c)
-- 
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