From 80d9328c1f05355ad2eaa967798b2dc77b67ddb3 Mon Sep 17 00:00:00 2001
From: Ruben Ayrapetyan <r.ayrapetyan@samsung.com>
Date: Fri, 27 Mar 2015 14:19:33 +0300
Subject: [PATCH] Providing option for disabling LTO build mode.

---
 CMakeLists.txt | 11 +++++++++--
 Makefile       | 20 ++++++++++++++------
 2 files changed, 23 insertions(+), 8 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index c778bd6b8..52ab6eccc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -60,6 +60,7 @@ project (Jerry CXX C ASM)
 
 # Determining platform and defining options
  option(ENABLE_VALGRIND "Enable valgrind helpers in memory allocators" OFF)
+ option(ENABLE_LTO      "Enable LTO build" ON)
 
  set(PLATFORM "${CMAKE_SYSTEM_NAME}")
  string(TOUPPER "${PLATFORM}" PLATFORM)
@@ -156,8 +157,14 @@ project (Jerry CXX C ASM)
        ${MODIFIERS_LISTS_LINUX})
 
 # Compiler / Linker flags
- set(COMPILE_FLAGS_JERRY "-flto -fno-fat-lto-objects -fno-builtin")
- set(LINKER_FLAGS_COMMON "-flto")
+ set(COMPILE_FLAGS_JERRY "-fno-builtin")
+ set(LINKER_FLAGS_COMMON "")
+
+ # LTO
+  if("${ENABLE_LTO}" STREQUAL "ON")
+   set(COMPILE_FLAGS_JERRY "${COMPILE_FLAGS_JERRY} -flto -fno-fat-lto-objects")
+   set(LINKER_FLAGS_COMMON "${LINKER_FLAGS_COMMON} -flto")
+  endif()
 
  # Turn off stack protector
   set(COMPILE_FLAGS_JERRY "${COMPILE_FLAGS_JERRY} -fno-stack-protector")
diff --git a/Makefile b/Makefile
index 31b83fcfb..6b617ba56 100644
--- a/Makefile
+++ b/Makefile
@@ -47,6 +47,7 @@
   ifneq ($(VALGRIND),ON)
    VALGRIND := OFF
   endif
+
  # Static checkers
   STATIC_CHECK ?= OFF
 
@@ -54,6 +55,13 @@
    STATIC_CHECK := OFF
   endif
 
+ # LTO
+  LTO ?= ON
+
+  ifneq ($(LTO),ON)
+   LTO := OFF
+  endif
+
 # External build configuration
  EXTERNAL_LIBS_INTERFACE ?= $(shell pwd)/third-party/nuttx/include
  EXTERNAL_C_COMPILER ?= arm-none-eabi-gcc
@@ -102,10 +110,10 @@ export SHELL=/bin/bash
 
 # Building all options combinations
  OPTIONS_COMBINATIONS := $(foreach __OPTION,ON OFF,$(__COMBINATION)-VALGRIND-$(__OPTION))
- # OPTIONS_COMBINATIONS := $(foreach __COMBINATION,$(OPTIONS_COMBINATIONS),$(foreach __OPTION,ON OFF,$(__COMBINATION)-{ANOTHER_OPTION}-$(__OPTION)))
+ OPTIONS_COMBINATIONS := $(foreach __COMBINATION,$(OPTIONS_COMBINATIONS),$(foreach __OPTION,ON OFF,$(__COMBINATION)-LTO-$(__OPTION)))
 
 # Building current options string
- OPTIONS_STRING := -VALGRIND-$(VALGRIND)
+ OPTIONS_STRING := -VALGRIND-$(VALGRIND)-LTO-$(LTO)
 
 # Build directories
  BUILD_DIR_PREFIX := ./build/obj
@@ -138,7 +146,7 @@ $(BUILD_DIRS_NATIVE):
           fi; \
 	  mkdir -p $@ && \
           cd $@ && \
-          cmake -DENABLE_VALGRIND=$(VALGRIND) -DCMAKE_TOOLCHAIN_FILE=build/configs/toolchain_linux_$$arch.cmake ../../.. &>cmake.log || \
+          cmake -DENABLE_VALGRIND=$(VALGRIND) -DENABLE_LTO=$(LTO) -DCMAKE_TOOLCHAIN_FILE=build/configs/toolchain_linux_$$arch.cmake ../../.. &>cmake.log || \
           (echo "CMake run failed. See "`pwd`"/cmake.log for details."; exit 1;)
 
 $(BUILD_DIRS_NUTTX):
@@ -151,7 +159,7 @@ $(BUILD_DIRS_NUTTX):
 	@ mkdir -p $@ && \
           cd $@ && \
           cmake \
-          -DENABLE_VALGRIND=$(VALGRIND) \
+          -DENABLE_VALGRIND=$(VALGRIND) -DENABLE_LTO=$(LTO) \
           -DCMAKE_TOOLCHAIN_FILE=build/configs/toolchain_external.cmake \
           -DEXTERNAL_LIBC_INTERFACE=${EXTERNAL_LIBS_INTERFACE} \
           -DEXTERNAL_CMAKE_C_COMPILER=${EXTERNAL_C_COMPILER} \
@@ -162,13 +170,13 @@ $(BUILD_DIRS_NUTTX):
 $(BUILD_DIRS_STM32F3):
 	@ mkdir -p $@ && \
           cd $@ && \
-          cmake -DENABLE_VALGRIND=$(VALGRIND) -DCMAKE_TOOLCHAIN_FILE=build/configs/toolchain_mcu_stm32f3.cmake ../../.. &>cmake.log || \
+          cmake -DENABLE_VALGRIND=$(VALGRIND) -DENABLE_LTO=$(LTO) -DCMAKE_TOOLCHAIN_FILE=build/configs/toolchain_mcu_stm32f3.cmake ../../.. &>cmake.log || \
           (echo "CMake run failed. See "`pwd`"/cmake.log for details."; exit 1;)
 
 $(BUILD_DIRS_STM32F4):
 	@ mkdir -p $@ && \
           cd $@ && \
-          cmake -DENABLE_VALGRIND=$(VALGRIND) -DCMAKE_TOOLCHAIN_FILE=build/configs/toolchain_mcu_stm32f4.cmake ../../.. &>cmake.log || \
+          cmake -DENABLE_VALGRIND=$(VALGRIND) -DENABLE_LTO=$(LTO) -DCMAKE_TOOLCHAIN_FILE=build/configs/toolchain_mcu_stm32f4.cmake ../../.. &>cmake.log || \
           (echo "CMake run failed. See "`pwd`"/cmake.log for details."; exit 1;)
 
 $(JERRY_LINUX_TARGETS): $(BUILD_DIR)/native