kernel: support setting extra CFLAGS for kernel compilation

[openwrt/staging/jow.git] / include / kernel.mk

diff --git a/include/kernel.mk b/include/kernel.mk
index 1466048b0c1edb220557ca3a4c79a54513b8bda5..d99dd0a534097a79fd44b0ceba823671f6d6d430 100644 (file)
--- a/include/kernel.mk
+++ b/include/kernel.mk
@@ -1,9 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0-only
 #
-# Copyright (C) 2006-2015 OpenWrt.org
-#
-# This is free software, licensed under the GNU General Public License v2.
-# See /LICENSE for more information.
-#
+# Copyright (C) 2006-2020 OpenWrt.org
 
 ifneq ($(filter check,$(MAKECMDGOALS)),)
 CHECK:=1
@@ -104,7 +101,7 @@ endif
 KERNEL_MAKE = $(MAKE) $(KERNEL_MAKEOPTS)
 
 KERNEL_MAKE_FLAGS = \
-       KCFLAGS="$(call iremap,$(BUILD_DIR),$(notdir $(BUILD_DIR)))" \
+       KCFLAGS="$(call iremap,$(BUILD_DIR),$(notdir $(BUILD_DIR))) $(call qstrip,$(CONFIG_EXTRA_OPTIMIZATION)) $(call qstrip,$(CONFIG_KERNEL_CFLAGS))" \
        HOSTCFLAGS="$(HOST_CFLAGS) -Wall -Wmissing-prototypes -Wstrict-prototypes" \
        CROSS_COMPILE="$(KERNEL_CROSS)" \
        ARCH="$(LINUX_KARCH)" \
@@ -113,14 +110,16 @@ KERNEL_MAKE_FLAGS = \
        KBUILD_BUILD_HOST="$(call qstrip,$(CONFIG_KERNEL_BUILD_DOMAIN))" \
        KBUILD_BUILD_TIMESTAMP="$(KBUILD_BUILD_TIMESTAMP)" \
        KBUILD_BUILD_VERSION="0" \
-       HOST_LOADLIBES="-L$(STAGING_DIR_HOST)/lib" \
-       KBUILD_HOSTLDLIBS="-L$(STAGING_DIR_HOST)/lib" \
+       KBUILD_HOSTLDFLAGS="-L$(STAGING_DIR_HOST)/lib" \
        CONFIG_SHELL="$(BASH)" \
        $(if $(findstring c,$(OPENWRT_VERBOSE)),V=1,V='') \
        $(if $(PKG_BUILD_ID),LDFLAGS_MODULE=--build-id=0x$(PKG_BUILD_ID)) \
        cmd_syscalls= \
        $(if $(__package_mk),KBUILD_EXTRA_SYMBOLS="$(wildcard $(PKG_SYMVERS_DIR)/*.symvers)")
 
+KERNEL_NOSTDINC_FLAGS = \
+       -nostdinc $(if $(DUMP),, -isystem $(shell $(TARGET_CC) -print-file-name=include))
+
 ifeq ($(call qstrip,$(CONFIG_EXTERNAL_KERNEL_TREE))$(call qstrip,$(CONFIG_KERNEL_GIT_CLONE_URI)),)
   KERNEL_MAKE_FLAGS += \
        KERNELRELEASE=$(LINUX_VERSION)