build: add option to enable LTO

[dpdk.git] / mk / toolchain / icc / rte.vars.mk

diff --git a/mk/toolchain/icc/rte.vars.mk b/mk/toolchain/icc/rte.vars.mk
index 2c5bdad..8aa87aa 100644 (file)
--- a/mk/toolchain/icc/rte.vars.mk
+++ b/mk/toolchain/icc/rte.vars.mk
@@ -1,53 +1,20 @@
-#   BSD LICENSE
-#
-#   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
-#   All rights reserved.
-#
-#   Redistribution and use in source and binary forms, with or without
-#   modification, are permitted provided that the following conditions
-#   are met:
-#
-#     * Redistributions of source code must retain the above copyright
-#       notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above copyright
-#       notice, this list of conditions and the following disclaimer in
-#       the documentation and/or other materials provided with the
-#       distribution.
-#     * Neither the name of Intel Corporation nor the names of its
-#       contributors may be used to endorse or promote products derived
-#       from this software without specific prior written permission.
-#
-#   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-#   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-#   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-#   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-#   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-#   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-#   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-#   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-#   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-#   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-#   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright(c) 2010-2014 Intel Corporation
 
 #
 # toolchain:
 #
-#   - define CC, LD, AR, AS, ... (overriden by cmdline value)
-#   - define TOOLCHAIN_CFLAGS variable (overriden by cmdline value)
-#   - define TOOLCHAIN_LDFLAGS variable (overriden by cmdline value)
-#   - define TOOLCHAIN_ASFLAGS variable (overriden by cmdline value)
-#
-# examples for RTE_TOOLCHAIN: gcc, icc
+#   - define CC, LD, AR, AS, ... (overridden by cmdline value)
+#   - define TOOLCHAIN_CFLAGS variable (overridden by cmdline value)
+#   - define TOOLCHAIN_LDFLAGS variable (overridden by cmdline value)
+#   - define TOOLCHAIN_ASFLAGS variable (overridden by cmdline value)
 #
 
 # Warning: we do not use CROSS environment variable as icc is mainly a
 # x86->x86 compiler
 
-ifeq ($(KERNELRELEASE),)
 CC        = icc
-else
-CC        = gcc
-endif
+KERNELCC  = gcc
 CPP       = cpp
 AS        = nasm
 AR        = ar
@@ -71,26 +38,29 @@ TOOLCHAIN_ASFLAGS =
 # Turn off some ICC warnings -
 #   Remark #271   : trailing comma is nonstandard
 #   Warning #1478 : function "<func_name>" (declared at line N of "<filename>")
+#   error #13368: loop was not vectorized with "vector always assert"
+#   error #15527: loop was not vectorized: function call to fprintf cannot be vectorize
 #                   was declared "deprecated"
-ifeq ($(CONFIG_RTE_EXEC_ENV),"linuxapp")
-WERROR_FLAGS := -Wall -Werror-all -w2 -diag-disable 271 -diag-warning 1478
-else
+#   Warning #11074, 11076: to prevent "inline-max-size" warnings.
+WERROR_FLAGS := -Wall -w2 -diag-disable 271 -diag-warning 1478
+WERROR_FLAGS += -diag-disable 13368 -diag-disable 15527
+WERROR_FLAGS += -diag-disable 188
+WERROR_FLAGS += -diag-disable 11074 -diag-disable 11076 -Wdeprecated
 
-# Turn off some ICC warnings -
-#   Remark #193   : zero used for undefined preprocessing identifier
-#                  (needed for newlib)
-#   Remark #271   : trailing comma is nonstandard
-#   Remark #1292  : attribute "warning" ignored ((warning ("the use of
-#                   `mktemp' is dangerous; use `mkstemp' instead"))));
-#                   (needed for newlib)
-#   Warning #1478 : function "<func_name>" (declared at line N of "<filename>")
-#                   was declared "deprecated"
-WERROR_FLAGS := -Wall -Werror-all -w2 -diag-disable 193,271,1292 \
-               -diag-warning 1478
+ifeq ($(RTE_DEVEL_BUILD),y)
+WERROR_FLAGS += -Werror-all
 endif
 
 # process cpu flags
 include $(RTE_SDK)/mk/toolchain/$(RTE_TOOLCHAIN)/rte.toolchain-compat.mk
 
+ifeq ($(CONFIG_RTE_ENABLE_LTO),y)
+# 'fat-lto' is used since pmdinfogen needs to have 'this_pmd_nameX'
+# exported in symbol table and without this option only internal
+# representation is present.
+TOOLCHAIN_CFLAGS += -flto -ffat-lto-objects
+TOOLCHAIN_LDFLAGS += -flto
+endif
+
 export CC AS AR LD OBJCOPY OBJDUMP STRIP READELF
 export TOOLCHAIN_CFLAGS TOOLCHAIN_LDFLAGS TOOLCHAIN_ASFLAGS