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buildroot/package/Makefile.in
Yann E. MORIN 8b525dc934 package-infra: add helper to build kernel modules 
The Linux kernel offers a nice and easy-to-use infra to build
out-of-tree kernel modules.

Currently, we have quite a few packages that build kernel modules, and
most duplicate (or rewrite) the same code over-and-over again.

Introduce a new infrastructure that provides helpers to build kernel
modules, so packages do not have to duplicate/rewrite that.

The infrastructure, unlike any other package infra, is not standalone.
It needs another package infra to be used. This is so that packages that
provide both userland and kernel modules can be built easily. So, this
infra only defines post-build and post-install hooks, that will build
the kernel modules after the rest of the package.

We need to override PWD, because some packages will use it to find their
own includes (and other helper files). PWD is inherited from the
environment, so it gets whatever value it had when make was launched,
which happens to be Buildroot's own top source tree. So, we just force
PWD to the proper value, rather than cd-ing first.

Also, no host version is provided, since it does not make sense to build
kernel modules for the host.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Baruch Siach <baruch@tkos.co.il>
Cc: Arnout Vandecappelle <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
2015-07-12 11:56:18 +02:00

403 lines
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Makefile
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ifndef MAKE
MAKE := make
endif
ifndef HOSTMAKE
HOSTMAKE = $(MAKE)
endif
HOSTMAKE := $(shell which $(HOSTMAKE) || type -p $(HOSTMAKE) || echo make)
# If BR2_JLEVEL is 0, scale the maximum concurrency with the number of
# CPUs. An additional job is used in order to keep processors busy
# while waiting on I/O.
# If the number of processors is not available, assume one.
ifeq ($(BR2_JLEVEL),0)
PARALLEL_JOBS := $(shell echo \
$$((1 + `getconf _NPROCESSORS_ONLN 2>/dev/null || echo 1`)))
else
PARALLEL_JOBS := $(BR2_JLEVEL)
endif
MAKE1 := $(HOSTMAKE) -j1
override MAKE = $(HOSTMAKE) \
$(if $(findstring j,$(filter-out --%,$(MAKEFLAGS))),,-j$(PARALLEL_JOBS))
ifeq ($(BR2_TOOLCHAIN_BUILDROOT),y)
TARGET_VENDOR = $(call qstrip,$(BR2_TOOLCHAIN_BUILDROOT_VENDOR))
else
TARGET_VENDOR = buildroot
endif
# Sanity checks
ifeq ($(TARGET_VENDOR),)
$(error BR2_TOOLCHAIN_BUILDROOT_VENDOR is not allowed to be empty)
endif
ifeq ($(TARGET_VENDOR),unknown)
$(error BR2_TOOLCHAIN_BUILDROOT_VENDOR cannot be 'unknown'. \
It might be confused with the native toolchain)
endif
# Compute GNU_TARGET_NAME
GNU_TARGET_NAME = $(ARCH)-$(TARGET_VENDOR)-$(TARGET_OS)-$(LIBC)$(ABI)
# FLAT binary format needs uclinux
ifeq ($(BR2_BINFMT_FLAT),y)
TARGET_OS = uclinux
else
TARGET_OS = linux
endif
ifeq ($(BR2_TOOLCHAIN_USES_UCLIBC),y)
LIBC = uclibc
else ifeq ($(BR2_TOOLCHAIN_USES_MUSL),y)
LIBC = musl
else
LIBC = gnu
endif
# The ABI suffix is a bit special on ARM, as it needs to be
# -uclibcgnueabi for uClibc EABI, and -gnueabi for glibc EABI.
# This means that the LIBC and ABI aren't strictly orthogonal,
# which explains why we need the test on LIBC below.
ifeq ($(BR2_arm)$(BR2_armeb),y)
ifeq ($(LIBC),uclibc)
ABI = gnueabi
else
ABI = eabi
endif
ifeq ($(BR2_ARM_EABIHF),y)
ABI := $(ABI)hf
endif
endif
# For FSL PowerPC there's SPE
ifeq ($(BR2_powerpc_SPE),y)
ABI = spe
# MPC8540s are e500v1 with single precision FP
ifeq ($(BR2_powerpc_8540),y)
TARGET_ABI += -mabi=spe -mfloat-gprs=single -Wa,-me500
endif
ifeq ($(BR2_powerpc_8548),y)
TARGET_ABI += -mabi=spe -mfloat-gprs=double -Wa,-me500x2
endif
ifeq ($(BR2_powerpc_e500mc),y)
TARGET_ABI += -mabi=spe -mfloat-gprs=double -Wa,-me500mc
endif
endif
# Use longcalls option for Xtensa globally.
# The 'longcalls' option allows calls across a greater range of addresses,
# and is required for some packages. While this option can degrade both
# code size and performance, the linker can usually optimize away the
# overhead when a call ends up within a certain range.
#
# Use text-section-literals for Xtensa globally.
# Collecting literals into separate section can be advantageous if that
# section is placed into DTCM at link time. This is applicable for code
# running on bare metal, but makes no sense under linux, where userspace
# is isolated from the physical memory details. OTOH placing literals into
# separate section breaks build of huge source files, because l32r
# instruction can only access literals in 256 KBytes range.
#
ifeq ($(BR2_xtensa),y)
TARGET_ABI += -mlongcalls -mtext-section-literals
endif
ifeq ($(BR2_arc)$(BR2_ARC_ATOMIC_EXT),yy)
TARGET_ABI += -matomic
endif
STAGING_SUBDIR = usr/$(GNU_TARGET_NAME)/sysroot
STAGING_DIR = $(HOST_DIR)/$(STAGING_SUBDIR)
TARGET_OPTIMIZATION := $(call qstrip,$(BR2_TARGET_OPTIMIZATION))
ifeq ($(BR2_OPTIMIZE_0),y)
TARGET_OPTIMIZATION += -O0
endif
ifeq ($(BR2_OPTIMIZE_1),y)
TARGET_OPTIMIZATION += -O1
endif
ifeq ($(BR2_OPTIMIZE_2),y)
TARGET_OPTIMIZATION += -O2
endif
ifeq ($(BR2_OPTIMIZE_3),y)
TARGET_OPTIMIZATION += -O3
endif
ifeq ($(BR2_OPTIMIZE_S),y)
TARGET_OPTIMIZATION += -Os
endif
ifeq ($(BR2_DEBUG_1),y)
TARGET_DEBUGGING = -g1
endif
ifeq ($(BR2_DEBUG_2),y)
TARGET_DEBUGGING = -g2
endif
ifeq ($(BR2_DEBUG_3),y)
TARGET_DEBUGGING = -g3
endif
TARGET_CPPFLAGS += -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
TARGET_CFLAGS = $(TARGET_CPPFLAGS) $(TARGET_ABI) $(TARGET_OPTIMIZATION) $(TARGET_DEBUGGING)
TARGET_CXXFLAGS = $(TARGET_CFLAGS)
TARGET_LDFLAGS = $(call qstrip,$(BR2_TARGET_LDFLAGS))
ifeq ($(BR2_BINFMT_FLAT),y)
TARGET_CFLAGS += $(if $($(PKG)_FLAT_STACKSIZE),-Wl$(comma)-elf2flt=-s$($(PKG)_FLAT_STACKSIZE),\
-Wl$(comma)-elf2flt)
TARGET_CXXFLAGS += $(if $($(PKG)_FLAT_STACKSIZE),-Wl$(comma)-elf2flt=-s$($(PKG)_FLAT_STACKSIZE),\
-Wl$(comma)-elf2flt)
TARGET_LDFLAGS += $(if $($(PKG)_FLAT_STACKSIZE),-elf2flt=-s$($(PKG)_FLAT_STACKSIZE),-elf2flt)
endif
ifeq ($(BR2_BINFMT_FLAT_SHARED),y)
TARGET_LDFLAGS += -mid-shared-library -mshared-library-id=0
TARGET_CFLAGS += -mid-shared-library -mshared-library-id=0
TARGET_CXXFLAGS += -mid-shared-library -mshared-library-id=0
endif
ifeq ($(BR2_BINFMT_FLAT_SEP_DATA),y)
TARGET_LDFLAGS += -msep-data
TARGET_CFLAGS += -msep-data
TARGET_CXXFLAGS += -msep-data
endif
ifeq ($(BR2_ENABLE_SSP),y)
TARGET_CFLAGS += -fstack-protector-all
TARGET_CXXFLAGS += -fstack-protector-all
endif
ifeq ($(BR2_TOOLCHAIN_BUILDROOT),y)
TARGET_CROSS = $(HOST_DIR)/usr/bin/$(GNU_TARGET_NAME)-
else
TARGET_CROSS = $(HOST_DIR)/usr/bin/$(call qstrip,$(BR2_TOOLCHAIN_EXTERNAL_PREFIX))-
endif
# Define TARGET_xx variables for all common binutils/gcc
TARGET_AR = $(TARGET_CROSS)ar
TARGET_AS = $(TARGET_CROSS)as
TARGET_CC = $(TARGET_CROSS)gcc
TARGET_CPP = $(TARGET_CROSS)cpp
TARGET_CXX = $(TARGET_CROSS)g++
TARGET_FC = $(TARGET_CROSS)gfortran
TARGET_LD = $(TARGET_CROSS)ld
TARGET_NM = $(TARGET_CROSS)nm
TARGET_RANLIB = $(TARGET_CROSS)ranlib
TARGET_READELF = $(TARGET_CROSS)readelf
TARGET_OBJCOPY = $(TARGET_CROSS)objcopy
TARGET_OBJDUMP = $(TARGET_CROSS)objdump
TARGET_CC_NOCCACHE := $(TARGET_CC)
TARGET_CXX_NOCCACHE := $(TARGET_CXX)
ifeq ($(BR2_CCACHE),y)
TARGET_CC := $(CCACHE) $(TARGET_CC)
TARGET_CXX := $(CCACHE) $(TARGET_CXX)
endif
ifeq ($(BR2_STRIP_strip),y)
STRIP_STRIP_DEBUG := --strip-debug
STRIP_STRIP_UNNEEDED := --strip-unneeded
STRIP_STRIP_ALL := --strip-all
TARGET_STRIP = $(TARGET_CROSS)strip
STRIPCMD = $(TARGET_CROSS)strip --remove-section=.comment --remove-section=.note
KSTRIPCMD = $(STRIPCMD) $(STRIP_STRIP_UNNEEDED)
endif
ifeq ($(BR2_STRIP_sstrip),y)
STRIP_STRIP_DEBUG :=
STRIP_STRIP_UNNEEDED :=
STRIP_STRIP_ALL :=
TARGET_STRIP = $(HOST_DIR)/usr/bin/$(GNU_TARGET_NAME)-sstrip
STRIPCMD = $(TARGET_STRIP)
KSTRIPCMD = $(TARGET_CROSS)strip --remove-section=.comment --remove-section=.note --strip-unneeded
endif
ifeq ($(BR2_STRIP_none),y)
TARGET_STRIP = true
STRIPCMD = $(TARGET_STRIP)
KSTRIPCMD = $(TARGET_STRIP)
endif
INSTALL := $(shell which install || type -p install)
FLEX := $(shell which flex || type -p flex)
BISON := $(shell which bison || type -p bison)
SED := $(shell which sed || type -p sed) -i -e
UNZIP := $(shell which unzip || type -p unzip) -q
APPLY_PATCHES = support/scripts/apply-patches.sh $(if $(QUIET),-s)
HOST_CPPFLAGS = -I$(HOST_DIR)/usr/include
HOST_CFLAGS ?= -O2
HOST_CFLAGS += $(HOST_CPPFLAGS)
HOST_CXXFLAGS += $(HOST_CFLAGS)
HOST_LDFLAGS += -L$(HOST_DIR)/lib -L$(HOST_DIR)/usr/lib -Wl,-rpath,$(HOST_DIR)/usr/lib
# hostcc version as an integer - E.G. 4.3.2 => 432
HOSTCC_VERSION := $(shell $(HOSTCC_NOCCACHE) --version | \
sed -n 's/^.* \([0-9]*\)\.\([0-9]*\)\.\([0-9]*\)[ ]*.*$$/\1\2\3/p')
# host-intltool should be executed with the system perl, so we save
# the path to the system perl, before a host-perl built by Buildroot
# might get installed into $(HOST_DIR)/usr/bin and therefore appears
# in our PATH. This system perl will be used as INTLTOOL_PERL.
export PERL=$(shell which perl)
# host-intltool needs libxml-parser-perl, which Buildroot installs in
# $(HOST_DIR)/usr/lib/perl, so we must make sure that the system perl
# finds this perl module by exporting the proper value for PERL5LIB.
export PERL5LIB=$(HOST_DIR)/usr/lib/perl
TARGET_CONFIGURE_OPTS = \
PATH=$(BR_PATH) \
AR="$(TARGET_AR)" \
AS="$(TARGET_AS)" \
LD="$(TARGET_LD)" \
NM="$(TARGET_NM)" \
CC="$(TARGET_CC)" \
GCC="$(TARGET_CC)" \
CPP="$(TARGET_CPP)" \
CXX="$(TARGET_CXX)" \
FC="$(TARGET_FC)" \
RANLIB="$(TARGET_RANLIB)" \
READELF="$(TARGET_READELF)" \
STRIP="$(TARGET_STRIP)" \
OBJCOPY="$(TARGET_OBJCOPY)" \
OBJDUMP="$(TARGET_OBJDUMP)" \
AR_FOR_BUILD="$(HOSTAR)" \
AS_FOR_BUILD="$(HOSTAS)" \
CC_FOR_BUILD="$(HOSTCC)" \
GCC_FOR_BUILD="$(HOSTCC)" \
CXX_FOR_BUILD="$(HOSTCXX)" \
LD_FOR_BUILD="$(HOSTLD)" \
CPPFLAGS_FOR_BUILD="$(HOST_CPPFLAGS)" \
CFLAGS_FOR_BUILD="$(HOST_CFLAGS)" \
CXXFLAGS_FOR_BUILD="$(HOST_CXXFLAGS)" \
LDFLAGS_FOR_BUILD="$(HOST_LDFLAGS)" \
FCFLAGS_FOR_BUILD="$(HOST_FCFLAGS)" \
DEFAULT_ASSEMBLER="$(TARGET_AS)" \
DEFAULT_LINKER="$(TARGET_LD)" \
CPPFLAGS="$(TARGET_CPPFLAGS)" \
CFLAGS="$(TARGET_CFLAGS)" \
CXXFLAGS="$(TARGET_CXXFLAGS)" \
LDFLAGS="$(TARGET_LDFLAGS)" \
FCFLAGS="$(TARGET_FCFLAGS)" \
PKG_CONFIG="$(PKG_CONFIG_HOST_BINARY)" \
STAGING_DIR="$(STAGING_DIR)" \
INTLTOOL_PERL=$(PERL)
TARGET_MAKE_ENV = PATH=$(BR_PATH)
HOST_CONFIGURE_OPTS = \
PATH=$(BR_PATH) \
AR="$(HOSTAR)" \
AS="$(HOSTAS)" \
LD="$(HOSTLD)" \
NM="$(HOSTNM)" \
CC="$(HOSTCC)" \
GCC="$(HOSTCC)" \
CXX="$(HOSTCXX)" \
CPP="$(HOSTCPP)" \
OBJCOPY="$(HOSTOBJCOPY)" \
RANLIB="$(HOSTRANLIB)" \
CPPFLAGS="$(HOST_CPPFLAGS)" \
CFLAGS="$(HOST_CFLAGS)" \
CXXFLAGS="$(HOST_CXXFLAGS)" \
LDFLAGS="$(HOST_LDFLAGS)" \
PKG_CONFIG_ALLOW_SYSTEM_CFLAGS=1 \
PKG_CONFIG_ALLOW_SYSTEM_LIBS=1 \
PKG_CONFIG="$(PKG_CONFIG_HOST_BINARY)" \
PKG_CONFIG_SYSROOT_DIR="/" \
PKG_CONFIG_LIBDIR="$(HOST_DIR)/usr/lib/pkgconfig:$(HOST_DIR)/usr/share/pkgconfig" \
LD_LIBRARY_PATH="$(HOST_DIR)/usr/lib$(if $(LD_LIBRARY_PATH),:$(LD_LIBRARY_PATH))" \
INTLTOOL_PERL=$(PERL)
HOST_MAKE_ENV = \
PATH=$(BR_PATH) \
LD_LIBRARY_PATH="$(HOST_DIR)/usr/lib$(if $(LD_LIBRARY_PATH),:$(LD_LIBRARY_PATH))" \
PKG_CONFIG="$(PKG_CONFIG_HOST_BINARY)" \
PKG_CONFIG_SYSROOT_DIR="/" \
PKG_CONFIG_LIBDIR="$(HOST_DIR)/usr/lib/pkgconfig"
# This is extra environment we can not export ourselves (eg. because some
# packages use that variable internally, eg. uboot), so we have to
# explicitly pass it to user-supplied external hooks (eg. post-build,
# post-images)
EXTRA_ENV = \
PATH=$(BR_PATH) \
BR2_DL_DIR=$(BR2_DL_DIR) \
BUILD_DIR=$(BUILD_DIR) \
BR2_EXTERNAL=$(BR2_EXTERNAL)
################################################################################
# settings we need to pass to configure
# does unaligned access trap?
BR2_AC_CV_TRAP_CHECK = ac_cv_lbl_unaligned_fail=yes
ifeq ($(BR2_i386),y)
BR2_AC_CV_TRAP_CHECK = ac_cv_lbl_unaligned_fail=no
endif
ifeq ($(BR2_x86_64),y)
BR2_AC_CV_TRAP_CHECK = ac_cv_lbl_unaligned_fail=no
endif
ifeq ($(BR2_m68k),y)
BR2_AC_CV_TRAP_CHECK = ac_cv_lbl_unaligned_fail=no
endif
ifeq ($(BR2_powerpc)$(BR2_powerpc64)$(BR2_powerpc64le),y)
BR2_AC_CV_TRAP_CHECK = ac_cv_lbl_unaligned_fail=no
endif
ifeq ($(BR2_ENDIAN),"BIG")
BR2_AC_CV_C_BIGENDIAN = ac_cv_c_bigendian=yes
else
BR2_AC_CV_C_BIGENDIAN = ac_cv_c_bigendian=no
endif
TARGET_CONFIGURE_ARGS = \
$(BR2_AC_CV_TRAP_CHECK) \
ac_cv_func_mmap_fixed_mapped=yes \
ac_cv_func_memcmp_working=yes \
ac_cv_have_decl_malloc=yes \
gl_cv_func_malloc_0_nonnull=yes \
ac_cv_func_malloc_0_nonnull=yes \
ac_cv_func_calloc_0_nonnull=yes \
ac_cv_func_realloc_0_nonnull=yes \
lt_cv_sys_lib_search_path_spec="" \
$(BR2_AC_CV_C_BIGENDIAN)
################################################################################
ifeq ($(BR2_ENABLE_LOCALE),y)
DISABLE_NLS :=
else
DISABLE_NLS :=--disable-nls
endif
ifneq ($(BR2_INSTALL_LIBSTDCPP),y)
TARGET_CONFIGURE_OPTS += CXX=false
endif
ifeq ($(BR2_STATIC_LIBS),y)
SHARED_STATIC_LIBS_OPTS = --enable-static --disable-shared
TARGET_CFLAGS += -static
TARGET_CXXFLAGS += -static
TARGET_LDFLAGS += -static
else ifeq ($(BR2_SHARED_LIBS),y)
SHARED_STATIC_LIBS_OPTS = --disable-static --enable-shared
else ifeq ($(BR2_SHARED_STATIC_LIBS),y)
SHARED_STATIC_LIBS_OPTS = --enable-static --enable-shared
endif
ifeq ($(BR2_COMPILER_PARANOID_UNSAFE_PATH),y)
export BR_COMPILER_PARANOID_UNSAFE_PATH=enabled
endif
include package/pkg-download.mk
include package/pkg-autotools.mk
include package/pkg-cmake.mk
include package/pkg-luarocks.mk
include package/pkg-perl.mk
include package/pkg-python.mk
include package/pkg-virtual.mk
include package/pkg-generic.mk
include package/pkg-kconfig.mk
include package/pkg-rebar.mk
include package/pkg-kernel-module.mk
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