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# $Id: Makefile-footer.gmk $
## @file
# VirtualBox Guest Additions kernel module Makefile, common parts.
#
# See Makefile-header.gmk for details of how to use this.
#
#
# Copyright (C) 2006-2023 Oracle and/or its affiliates.
#
# This file is part of VirtualBox base platform packages, as
# available from https://www.virtualbox.org.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation, in version 3 of the
# License.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, see <https://www.gnu.org/licenses>.
#
# SPDX-License-Identifier: GPL-3.0-only
#
VBOXMOD_0_TARGET = $(VBOXMOD_NAME)
KBUILD_VERBOSE ?= 1 # Variable belongs to our kBuild, not the linux one.
VBOX_LNX_VERBOSE = $(if $(KBUILD_VERBOSE),1,)
#
# Compiler options
#
VBOXMOD_0_KFLAGS := -D__KERNEL__ -DMODULE -DRT_WITHOUT_PRAGMA_ONCE $(addprefix -D,$(VBOXMOD_DEFS))
ifeq ($(VBOX_KBUILD_TARGET_ARCH),amd64)
VBOXMOD_0_KFLAGS += -DRT_ARCH_AMD64
else
VBOXMOD_0_KFLAGS += -DRT_ARCH_X86
endif
ifeq ($(VBOX_KBUILD_TYPE),debug)
# The -Wno-array-bounds is because of a bug in gcc 4.something, see
# https://sourceware.org/bugzilla/show_bug.cgi?id=10001
VBOXMOD_0_KFLAGS += -DDEBUG -DDEBUG_$(subst $(subst _, ,_),_,$(USERNAME)) -DDEBUG_USERNAME=$(subst $(subst _, ,_),_,$(USERNAME))
ifeq ($(shell expr $(KERN_VER) : '[23]\.'),0)
VBOXMOD_0_KFLAGS += -Werror -Wall -Wno-array-bounds
# clang objects to calls to __builtin_frame_address with a non-zero argument
# on general principles in -Wall mode. The x86 linux kernel has two such calls
# in the thread_info.h / arch_within_stack_frames(), though probably safe.
ifndef ($(LLVM),) # (This is how the Linux root Makefile (since 5.7) does the test.)
VBOXMOD_0_KFLAGS += -Wno-frame-address
endif
endif
endif
ifeq ($(VBOX_KERN_GROKS_EXTMOD),)
#
# Pre 2.6.6
#
# Note: While pre 2.6.6 kernels could also do "proper" builds from kbuild, the
# make script needed to support it was somewhat different from 2.6. Since this
# script works and pre-2.6.6 is not a moving target we will not try do do things
# the "proper" way.
#
VBOXMOD_EXT := o
ifeq ($(VBOX_KBUILD_TARGET_ARCH),amd64)
VBOXMOD_0_KFLAGS += -mcmodel=kernel
endif
ifeq ($(KERN_VERSION),24)
VBOXMOD_0_KFLAGS += -DVBOX_LINUX_2_4
endif
CFLAGS := -O2 $(VBOXMOD_CFLAGS) $(addprefix -I,$(KERN_INCL) $(VBOXMOD_INCL)) $(VBOXMOD_0_KFLAGS) $(KDEBUG)
# 2.4 Module linking
$(VBOXMOD_0_TARGET).$(VBOXMOD_EXT): $(VBOXMOD_OBJS)
$(LD) -o $@ -r $(VBOXMOD_OBJS)
all: $(VBOXMOD_0_TARGET)
$(VBOXMOD_0_TARGET): $(VBOXMOD_0_TARGET).$(VBOXMOD_EXT)
install: $(VBOXMOD_0_TARGET)
@mkdir -p $(MODULE_DIR); \
install -m 0644 -o root -g root $(VBOXMOD_0_TARGET).$(VBOXMOD_EXT) $(MODULE_DIR); \
PATH="$(PATH):/bin:/sbin" depmod -a; sync
clean:
for f in $(sort $(dir $(VBOXMOD_OBJS))); do rm -f $$f/*.o $$f/.*.cmd $$f/.*.flags; done
rm -rf .$(VBOXMOD_NAME)* .tmp_ver* $(VBOXMOD_NAME).* Modules.symvers modules.order
.PHONY: all $(VBOXMOD_0_TARGET) install clean
else # VBOX_KERN_GROKS_EXTMOD
#
# 2.6.6 and later
#
VBOXMOD_EXT := ko
# build defs
EXTRA_CFLAGS += $(VBOXMOD_CFLAGS) $(addprefix -I,$(KERN_INCL) $(VBOXMOD_INCL)) $(VBOXMOD_0_KFLAGS) $(KDEBUG)
$(VBOXMOD_0_TARGET)-y := $(VBOXMOD_OBJS)
obj-m += $(VBOXMOD_0_TARGET).o
# Trigger parallel make job.
ifndef VBOX_NOJOBS
JOBS := $(shell (getconf _NPROCESSORS_ONLN || grep -Ec '^processor|^CPU[0-9]' /proc/cpuinfo) 2>/dev/null)
ifeq ($(JOBS),0)
override JOBS := 1
endif
else
JOBS :=
endif
VBOX_SUBDIR_VAR=$(if $(VBOX_KERN_GROKS_SUBDIRS),SUBDIRS,M)
# OL/UEK: CONFIG_MODULE_SIG= disables module signing for external modules.
# Ubuntu 18.04.3: CONFIG_MODULE_SIG_ALL= disables signing of all modules.
# We disable signing because we don't have any private key and want to leave
# the key handling and secure boot config to the user.
ifndef VBOX_ALLOW_MODULE_SIGNING
VBOX_DISABLE_SIGN=CONFIG_MODULE_SIG= CONFIG_MODULE_SIG_ALL=
endif
# rules:
all: $(VBOXMOD_0_TARGET)
$(VBOXMOD_0_TARGET):
$(MAKE) V=$(VBOX_LNX_VERBOSE) $(VBOX_DISABLE_SIGN) -C $(KERN_DIR) $(VBOX_SUBDIR_VAR)=$(CURDIR) SRCROOT=$(CURDIR) $(if $(JOBS),-j$(JOBS),) modules
install: $(VBOXMOD_0_TARGET)
$(MAKE) V=$(VBOX_LNX_VERBOSE) $(VBOX_DISABLE_SIGN) -C $(KERN_DIR) $(VBOX_SUBDIR_VAR)=$(CURDIR) SRCROOT=$(CURDIR) INSTALL_MOD_PATH=$(INSTALL_MOD_PATH) INSTALL_MOD_DIR=$(INSTALL_MOD_DIR) modules_install
modules_install: install
clean:
$(MAKE) V=$(VBOX_LNX_VERBOSE) $(VBOX_DISABLE_SIGN) -C $(KERN_DIR) $(VBOX_SUBDIR_VAR)=$(CURDIR) SRCROOT=$(CURDIR) clean
.PHONY: all $(VBOXMOD_0_TARGET) install modules_install clean
endif # VBOX_KERN_GROKS_EXTMOD
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