Makefile文件
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639行
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22.45 KB
# Copyright (C) 2009-2010 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Initialization of the NDK build system. This file is included by
# several build scripts.
#
# Disable GNU Make implicit rules
# this turns off the suffix rules built into make
.SUFFIXES:
# this turns off the RCS / SCCS implicit rules of GNU Make
% : RCS/%,v
% : RCS/%
% : %,v
% : s.%
% : SCCS/s.%
# If a rule fails, delete $@.
.DELETE_ON_ERROR:
# Define NDK_LOG=1 in your environment to display log traces when
# using the build scripts. See also the definition of ndk_log below.
#
NDK_LOG := $(strip $(NDK_LOG))
ifeq ($(NDK_LOG),true)
override NDK_LOG := 1
endif
# Check that we have at least GNU Make 3.81
# We do this by detecting whether 'lastword' is supported
#
MAKE_TEST := $(lastword a b c d e f)
ifneq ($(MAKE_TEST),f)
$(error Android NDK: GNU Make version $(MAKE_VERSION) is too low (should be >= 3.81))
endif
ifeq ($(NDK_LOG),1)
$(info Android NDK: GNU Make version $(MAKE_VERSION) detected)
endif
# NDK_ROOT *must* be defined and point to the root of the NDK installation
NDK_ROOT := $(strip $(NDK_ROOT))
ifndef NDK_ROOT
$(error ERROR while including init.mk: NDK_ROOT must be defined !)
endif
ifneq ($(words $(NDK_ROOT)),1)
$(info,The Android NDK installation path contains spaces: '$(NDK_ROOT)')
$(error,Please fix the problem by reinstalling to a different location.)
endif
# ====================================================================
#
# Define a few useful variables and functions.
# More stuff will follow in definitions.mk.
#
# ====================================================================
# Used to output warnings and error from the library, it's possible to
# disable any warnings or errors by overriding these definitions
# manually or by setting NDK_NO_WARNINGS or NDK_NO_ERRORS
__ndk_name := Android NDK
__ndk_info = $(info $(__ndk_name): $1 $2 $3 $4 $5)
__ndk_warning = $(warning $(__ndk_name): $1 $2 $3 $4 $5)
__ndk_error = $(error $(__ndk_name): $1 $2 $3 $4 $5)
ifdef NDK_NO_INFO
__ndk_info :=
endif
ifdef NDK_NO_WARNINGS
__ndk_warning :=
endif
ifdef NDK_NO_ERRORS
__ndk_error :=
endif
# -----------------------------------------------------------------------------
# Function : ndk_log
# Arguments: 1: text to print when NDK_LOG is defined to 1
# Returns : None
# Usage : $(call ndk_log,<some text>)
# -----------------------------------------------------------------------------
ifeq ($(NDK_LOG),1)
ndk_log = $(info $(__ndk_name): $1)
else
ndk_log :=
endif
# -----------------------------------------------------------------------------
# Function : host-toolchain-path
# Arguments: 1: NDK root
# 2: Toolchain name
# Returns : The parent path of all toolchains for this host. Note that
# HOST_TAG64 == HOST_TAG for 32-bit systems.
# -----------------------------------------------------------------------------
ifeq ($(NDK_NEW_TOOLCHAINS_LAYOUT),true)
host-toolchain-path = $1/$(HOST_TAG64)/$2
else
host-toolchain-path = $1/$2/prebuilt/$(HOST_TAG64)
endif
# -----------------------------------------------------------------------------
# Function : get-toolchain-root
# Arguments: 1: Toolchain name
# Returns : Path to the given prebuilt toolchain.
# -----------------------------------------------------------------------------
get-toolchain-root = $(call host-toolchain-path,$(NDK_TOOLCHAINS_ROOT),$1)
# -----------------------------------------------------------------------------
# Function : get-binutils-root
# Arguments: 1: NDK root
# 2: Toolchain name (no version number)
# Returns : Path to the given prebuilt binutils.
# -----------------------------------------------------------------------------
get-binutils-root = $1/binutils/$2
# -----------------------------------------------------------------------------
# Function : get-gcclibs-path
# Arguments: 1: NDK root
# 2: Toolchain name (no version number)
# Returns : Path to the given prebuilt gcclibs.
# -----------------------------------------------------------------------------
get-gcclibs-path = $1/gcclibs/$2
# ====================================================================
#
# Host system auto-detection.
#
# ====================================================================
#
# Determine host system and architecture from the environment
#
HOST_OS := $(strip $(HOST_OS))
ifndef HOST_OS
# On all modern variants of Windows (including Cygwin and Wine)
# the OS environment variable is defined to 'Windows_NT'
#
# The value of PROCESSOR_ARCHITECTURE will be x86 or AMD64
#
ifeq ($(OS),Windows_NT)
HOST_OS := windows
else
# For other systems, use the `uname` output
UNAME := $(shell uname -s)
ifneq (,$(findstring Linux,$(UNAME)))
HOST_OS := linux
endif
ifneq (,$(findstring Darwin,$(UNAME)))
HOST_OS := darwin
endif
# We should not be there, but just in case !
ifneq (,$(findstring CYGWIN,$(UNAME)))
HOST_OS := windows
endif
ifeq ($(HOST_OS),)
$(call __ndk_info,Unable to determine HOST_OS from uname -s: $(UNAME))
$(call __ndk_info,Please define HOST_OS in your environment.)
$(call __ndk_error,Aborting.)
endif
endif
$(call ndk_log,Host OS was auto-detected: $(HOST_OS))
else
$(call ndk_log,Host OS from environment: $(HOST_OS))
endif
# For all systems, we will have HOST_OS_BASE defined as
# $(HOST_OS), except on Cygwin where we will have:
#
# HOST_OS == cygwin
# HOST_OS_BASE == windows
#
# Trying to detect that we're running from Cygwin is tricky
# because we can't use $(OSTYPE): It's a Bash shell variable
# that is not exported to sub-processes, and isn't defined by
# other shells (for those with really weird setups).
#
# Instead, we assume that a program named /bin/uname.exe
# that can be invoked and returns a valid value corresponds
# to a Cygwin installation.
#
HOST_OS_BASE := $(HOST_OS)
ifeq ($(HOST_OS),windows)
ifneq (,$(strip $(wildcard /bin/uname.exe)))
$(call ndk_log,Found /bin/uname.exe on Windows host, checking for Cygwin)
# NOTE: The 2>NUL here is for the case where we're running inside the
# native Windows shell. On cygwin, this will create an empty NUL file
# that we're going to remove later (see below).
UNAME := $(shell /bin/uname.exe -s 2>NUL)
$(call ndk_log,uname -s returned: $(UNAME))
ifneq (,$(filter CYGWIN%,$(UNAME)))
$(call ndk_log,Cygwin detected: $(shell uname -a))
HOST_OS := cygwin
DUMMY := $(shell rm -f NUL) # Cleaning up
else
ifneq (,$(filter MINGW32%,$(UNAME)))
$(call ndk_log,MSys detected: $(shell uname -a))
HOST_OS := cygwin
else
$(call ndk_log,Cygwin *not* detected!)
endif
endif
endif
endif
ifneq ($(HOST_OS),$(HOST_OS_BASE))
$(call ndk_log, Host operating system detected: $(HOST_OS), base OS: $(HOST_OS_BASE))
else
$(call ndk_log, Host operating system detected: $(HOST_OS))
endif
# Always use /usr/bin/file on Darwin to avoid relying on broken Ports
# version. See http://b.android.com/53769 .
HOST_FILE_PROGRAM := file
ifeq ($(HOST_OS),darwin)
HOST_FILE_PROGRAM := /usr/bin/file
endif
HOST_ARCH := $(strip $(HOST_ARCH))
HOST_ARCH64 :=
ifndef HOST_ARCH
ifeq ($(HOST_OS_BASE),windows)
HOST_ARCH := $(PROCESSOR_ARCHITECTURE)
ifeq ($(HOST_ARCH),AMD64)
HOST_ARCH := x86
endif
# Windows is 64-bit if either ProgramW6432 or ProgramFiles(x86) is set
ifneq ("/",$(shell echo "%ProgramW6432%/%ProgramFiles(x86)%"))
HOST_ARCH64 := x86_64
endif
else # HOST_OS_BASE != windows
UNAME := $(shell uname -m)
ifneq (,$(findstring 86,$(UNAME)))
HOST_ARCH := x86
ifneq (,$(shell $(HOST_FILE_PROGRAM) -L $(SHELL) | grep 'x86[_-]64'))
HOST_ARCH64 := x86_64
endif
endif
# We should probably should not care at all
ifneq (,$(findstring Power,$(UNAME)))
HOST_ARCH := ppc
endif
ifeq ($(HOST_ARCH),)
$(call __ndk_info,Unsupported host architecture: $(UNAME))
$(call __ndk_error,Aborting)
endif
endif # HOST_OS_BASE != windows
$(call ndk_log,Host CPU was auto-detected: $(HOST_ARCH))
else
$(call ndk_log,Host CPU from environment: $(HOST_ARCH))
endif
ifeq (,$(HOST_ARCH64))
HOST_ARCH64 := $(HOST_ARCH)
endif
HOST_TAG := $(HOST_OS_BASE)-$(HOST_ARCH)
HOST_TAG64 := $(HOST_OS_BASE)-$(HOST_ARCH64)
# The directory separator used on this host
HOST_DIRSEP := :
ifeq ($(HOST_OS),windows)
HOST_DIRSEP := ;
endif
# The host executable extension
HOST_EXEEXT :=
ifeq ($(HOST_OS),windows)
HOST_EXEEXT := .exe
endif
# If we are on Windows, we need to check that we are not running
# Cygwin 1.5, which is deprecated and won't run our toolchain
# binaries properly.
#
ifeq ($(HOST_TAG),windows-x86)
ifeq ($(HOST_OS),cygwin)
# On cygwin, 'uname -r' returns something like 1.5.23(0.225/5/3)
# We recognize 1.5. as the prefix to look for then.
CYGWIN_VERSION := $(shell uname -r)
ifneq ($(filter XX1.5.%,XX$(CYGWIN_VERSION)),)
$(call __ndk_info,You seem to be running Cygwin 1.5, which is not supported.)
$(call __ndk_info,Please upgrade to Cygwin 1.7 or higher.)
$(call __ndk_error,Aborting.)
endif
endif
# special-case the host-tag
HOST_TAG := windows
endif
$(call ndk_log,HOST_TAG set to $(HOST_TAG))
# Check for NDK-specific versions of our host tools
HOST_TOOLS_ROOT := $(NDK_ROOT)/prebuilt/$(HOST_TAG64)
HOST_PREBUILT := $(strip $(wildcard $(HOST_TOOLS_ROOT)/bin))
HOST_AWK := $(strip $(NDK_HOST_AWK))
HOST_MAKE := $(strip $(NDK_HOST_MAKE))
HOST_PYTHON := $(strip $(NDK_HOST_PYTHON))
ifdef HOST_PREBUILT
$(call ndk_log,Host tools prebuilt directory: $(HOST_PREBUILT))
# The windows prebuilt binaries are for ndk-build.cmd
# On cygwin, we must use the Cygwin version of these tools instead.
ifneq ($(HOST_OS),cygwin)
ifndef HOST_AWK
HOST_AWK := $(wildcard $(HOST_PREBUILT)/awk$(HOST_EXEEXT))
endif
ifndef HOST_MAKE
HOST_MAKE := $(wildcard $(HOST_PREBUILT)/make$(HOST_EXEEXT))
endif
ifndef HOST_PYTHON
HOST_PYTHON := $(wildcard $(HOST_PREBUILT)/python$(HOST_EXEEXT))
endif
endif
else
$(call ndk_log,Host tools prebuilt directory not found, using system tools)
endif
HOST_ECHO := $(strip $(NDK_HOST_ECHO))
ifdef HOST_PREBUILT
ifndef HOST_ECHO
# Special case, on Cygwin, always use the host echo, not our prebuilt one
# which adds \r\n at the end of lines.
ifneq ($(HOST_OS),cygwin)
HOST_ECHO := $(strip $(wildcard $(HOST_PREBUILT)/echo$(HOST_EXEEXT)))
endif
endif
endif
ifndef HOST_ECHO
HOST_ECHO := echo
endif
$(call ndk_log,Host 'echo' tool: $(HOST_ECHO))
# Define HOST_ECHO_N to perform the equivalent of 'echo -n' on all platforms.
ifeq ($(HOST_OS),windows)
# Our custom toolbox echo binary supports -n.
HOST_ECHO_N := $(HOST_ECHO) -n
else
# On Posix, just use bare printf.
HOST_ECHO_N := printf %s
endif
$(call ndk_log,Host 'echo -n' tool: $(HOST_ECHO_N))
HOST_CMP := $(strip $(NDK_HOST_CMP))
ifdef HOST_PREBUILT
ifndef HOST_CMP
HOST_CMP := $(strip $(wildcard $(HOST_PREBUILT)/cmp$(HOST_EXEEXT)))
endif
endif
ifndef HOST_CMP
HOST_CMP := cmp
endif
$(call ndk_log,Host 'cmp' tool: $(HOST_CMP))
#
# Verify that the 'awk' tool has the features we need.
# Both Nawk and Gawk do.
#
HOST_AWK := $(strip $(HOST_AWK))
ifndef HOST_AWK
HOST_AWK := awk
endif
$(call ndk_log,Host 'awk' tool: $(HOST_AWK))
# Location of all awk scripts we use
BUILD_AWK := $(NDK_ROOT)/build/awk
AWK_TEST := $(shell $(HOST_AWK) -f $(BUILD_AWK)/check-awk.awk)
$(call ndk_log,Host 'awk' test returned: $(AWK_TEST))
ifneq ($(AWK_TEST),Pass)
$(call __ndk_info,Host 'awk' tool is outdated. Please define NDK_HOST_AWK to point to Gawk or Nawk !)
$(call __ndk_error,Aborting.)
endif
#
# On Cygwin/MSys, define the 'cygwin-to-host-path' function here depending on the
# environment. The rules are the following:
#
# 1/ If NDK_USE_CYGPATH=1 and cygpath does exist in your path, cygwin-to-host-path
# calls "cygpath -m" for each host path. Since invoking 'cygpath -m' from GNU
# Make for each source file is _very_ slow, this is only a backup plan in
# case our automatic substitution function (described below) doesn't work.
#
# 2/ Generate a Make function that performs the mapping from cygwin/msys to host
# paths through simple substitutions. It's really a series of nested patsubst
# calls, that loo like:
#
# cygwin-to-host-path = $(patsubst /cygdrive/c/%,c:/%,\
# $(patsusbt /cygdrive/d/%,d:/%, \
# $1)
# or in MSys:
# cygwin-to-host-path = $(patsubst /c/%,c:/%,\
# $(patsusbt /d/%,d:/%, \
# $1)
#
# except that the actual definition is built from the list of mounted
# drives as reported by "mount" and deals with drive letter cases (i.e.
# '/cygdrive/c' and '/cygdrive/C')
#
ifeq ($(HOST_OS),cygwin)
CYGPATH := $(strip $(HOST_CYGPATH))
ifndef CYGPATH
$(call ndk_log, Probing for 'cygpath' program)
CYGPATH := $(strip $(shell which cygpath 2>/dev/null))
ifndef CYGPATH
$(call ndk_log, 'cygpath' was *not* found in your path)
else
$(call ndk_log, 'cygpath' found as: $(CYGPATH))
endif
endif
ifeq ($(NDK_USE_CYGPATH),1)
ifndef CYGPATH
$(call __ndk_info,No cygpath)
$(call __ndk_error,Aborting)
endif
$(call ndk_log, Forced usage of 'cygpath -m' through NDK_USE_CYGPATH=1)
cygwin-to-host-path = $(strip $(shell $(CYGPATH) -m $1))
else
# Call an awk script to generate a Makefile fragment used to define a function
WINDOWS_HOST_PATH_FRAGMENT := $(shell mount | tr '\\' '/' | $(HOST_AWK) -f $(BUILD_AWK)/gen-windows-host-path.awk)
ifeq ($(NDK_LOG),1)
$(info Using cygwin substitution rules:)
$(eval $(shell mount | tr '\\' '/' | $(HOST_AWK) -f $(BUILD_AWK)/gen-windows-host-path.awk -vVERBOSE=1))
endif
$(eval cygwin-to-host-path = $(WINDOWS_HOST_PATH_FRAGMENT))
endif
endif # HOST_OS == cygwin
# The location of the build system files
BUILD_SYSTEM := $(NDK_ROOT)/build/core
# Include common definitions
include $(BUILD_SYSTEM)/definitions.mk
# ====================================================================
#
# Read all platform-specific configuration files.
#
# Each platform must be located in build/platforms/android-<apilevel>
# where <apilevel> corresponds to an API level number, with:
# 3 -> Android 1.5
# 4 -> next platform release
#
# ====================================================================
# The platform files were moved in the Android source tree from
# $TOP/ndk/build/platforms to $TOP/development/ndk/platforms. However,
# the official NDK release packages still place them under the old
# location for now, so deal with this here
#
NDK_PLATFORMS_ROOT := $(strip $(NDK_PLATFORMS_ROOT))
ifndef NDK_PLATFORMS_ROOT
NDK_PLATFORMS_ROOT := $(strip $(wildcard $(NDK_ROOT)/platforms))
ifndef NDK_PLATFORMS_ROOT
NDK_PLATFORMS_ROOT := $(strip $(wildcard $(NDK_ROOT)/build/platforms))
endif
ifndef NDK_PLATFORMS_ROOT
$(call __ndk_info,Could not find platform files (headers and libraries))
$(if $(strip $(wildcard $(NDK_ROOT)/RELEASE.TXT)),\
$(call __ndk_info,Please define NDK_PLATFORMS_ROOT to point to a valid directory.)\
,\
$(call __ndk_info,Please run build/tools/gen-platforms.sh to build the corresponding directory.)\
)
$(call __ndk_error,Aborting)
endif
$(call ndk_log,Found platform root directory: $(NDK_PLATFORMS_ROOT))
endif
ifeq ($(strip $(wildcard $(NDK_PLATFORMS_ROOT)/android-*)),)
$(call __ndk_info,Your NDK_PLATFORMS_ROOT points to an invalid directory)
$(call __ndk_info,Current value: $(NDK_PLATFORMS_ROOT))
$(call __ndk_error,Aborting)
endif
NDK_ALL_PLATFORMS := $(strip $(notdir $(wildcard $(NDK_PLATFORMS_ROOT)/android-*)))
$(call ndk_log,Found supported platforms: $(NDK_ALL_PLATFORMS))
$(foreach _platform,$(NDK_ALL_PLATFORMS),\
$(eval include $(BUILD_SYSTEM)/add-platform.mk)\
)
# we're going to find the maximum platform number of the form android-<number>
# ignore others, which could correspond to special and experimental cases
NDK_PREVIEW_LEVEL := L
NDK_ALL_PLATFORM_LEVELS := $(filter android-%,$(NDK_ALL_PLATFORMS))
NDK_ALL_PLATFORM_LEVELS := $(patsubst android-%,%,$(NDK_ALL_PLATFORM_LEVELS))
ifneq (,$(filter $(NDK_PREVIEW_LEVEL),$(NDK_ALL_PLATFORM_LEVELS)))
$(call __ndk_info,Please remove stale preview platforms/android-$(NDK_PREVIEW_LEVEL))
$(call __ndk_info,API level android-L is renamed as android-21.)
$(call __ndk_error,Aborting)
endif
$(call ndk_log,Found stable platform levels: $(NDK_ALL_PLATFORM_LEVELS))
NDK_MAX_PLATFORM_LEVEL := 3
$(foreach level,$(NDK_ALL_PLATFORM_LEVELS),\
$(eval NDK_MAX_PLATFORM_LEVEL := $$(call max,$$(NDK_MAX_PLATFORM_LEVEL),$$(level)))\
)
$(call ndk_log,Found max platform level: $(NDK_MAX_PLATFORM_LEVEL))
# Allow the user to point at an alternate location for the toolchains. This is
# particularly helpful if we want to use prebuilt toolchains for building an NDK
# module. Specifically, we use this to build libc++ using ndk-build instead of
# the old build-cxx-stl.sh and maintaining two sets of build rules.
NDK_TOOLCHAINS_ROOT := $(strip $(NDK_TOOLCHAINS_ROOT))
ifndef NDK_TOOLCHAINS_ROOT
NDK_TOOLCHAINS_ROOT := $(strip $(NDK_ROOT)/toolchains)
endif
# ====================================================================
#
# Read all toolchain-specific configuration files.
#
# Each toolchain must have a corresponding config.mk file located
# in build/toolchains/<name>/ that will be included here.
#
# Each one of these files should define the following variables:
# TOOLCHAIN_NAME toolchain name (e.g. arm-linux-androideabi-4.9)
# TOOLCHAIN_ABIS list of target ABIs supported by the toolchain.
#
# Then, it should include $(ADD_TOOLCHAIN) which will perform
# book-keeping for the build system.
#
# ====================================================================
# the build script to include in each toolchain config.mk
ADD_TOOLCHAIN := $(BUILD_SYSTEM)/add-toolchain.mk
# the list of known abis and archs
NDK_KNOWN_DEVICE_ABI64S := arm64-v8a x86_64 mips64
NDK_KNOWN_DEVICE_ABI32S := armeabi-v7a armeabi x86 mips
NDK_KNOWN_DEVICE_ABIS := $(NDK_KNOWN_DEVICE_ABI64S) $(NDK_KNOWN_DEVICE_ABI32S)
NDK_KNOWN_ABIS := armeabi-v7a-hard $(NDK_KNOWN_DEVICE_ABIS)
NDK_KNOWN_ABI32S := armeabi-v7a-hard $(NDK_KNOWN_DEVICE_ABI32S)
NDK_KNOWN_ARCHS := arm x86 mips arm64 x86_64 mips64
_archs := $(sort $(strip $(notdir $(wildcard $(NDK_PLATFORMS_ROOT)/android-*/arch-*))))
NDK_FOUND_ARCHS := $(_archs:arch-%=%)
# the list of abis 'APP_ABI=all' is expanded to
ifneq (,$(filter yes all all32 all64,$(_NDK_TESTING_ALL_)))
NDK_APP_ABI_ALL_EXPANDED := $(NDK_KNOWN_ABIS)
NDK_APP_ABI_ALL32_EXPANDED := $(NDK_KNOWN_ABI32S)
else
NDK_APP_ABI_ALL_EXPANDED := $(NDK_KNOWN_DEVICE_ABIS)
NDK_APP_ABI_ALL32_EXPANDED := $(NDK_KNOWN_DEVICE_ABI32S)
endif
NDK_APP_ABI_ALL64_EXPANDED := $(NDK_KNOWN_DEVICE_ABI64S)
# For testing purpose
ifeq ($(_NDK_TESTING_ALL_),all32)
NDK_APP_ABI_ALL_EXPANDED := $(NDK_APP_ABI_ALL32_EXPANDED)
else
ifeq ($(_NDK_TESTING_ALL_),all64)
NDK_APP_ABI_ALL_EXPANDED := $(NDK_APP_ABI_ALL64_EXPANDED)
endif
endif
# The first API level ndk-build enforces -fPIE for executable
NDK_FIRST_PIE_PLATFORM_LEVEL := 16
# the list of all toolchains in this NDK
NDK_ALL_TOOLCHAINS :=
NDK_ALL_ABIS :=
NDK_ALL_ARCHS :=
TOOLCHAIN_CONFIGS := $(wildcard $(NDK_ROOT)/build/core/toolchains/*/config.mk)
$(foreach _config_mk,$(TOOLCHAIN_CONFIGS),\
$(eval include $(BUILD_SYSTEM)/add-toolchain.mk)\
)
NDK_ALL_TOOLCHAINS := $(sort $(NDK_ALL_TOOLCHAINS))
NDK_ALL_ABIS := $(sort $(NDK_ALL_ABIS))
NDK_ALL_ARCHS := $(sort $(NDK_ALL_ARCHS))
# Check that each ABI has a single architecture definition
$(foreach _abi,$(strip $(NDK_ALL_ABIS)),\
$(if $(filter-out 1,$(words $(NDK_ABI.$(_abi).arch))),\
$(call __ndk_info,INTERNAL ERROR: The $(_abi) ABI should have exactly one architecture definitions. Found: '$(NDK_ABI.$(_abi).arch)')\
$(call __ndk_error,Aborting...)\
)\
)
# Allow the user to define NDK_TOOLCHAIN to a custom toolchain name.
# This is normally used when the NDK release comes with several toolchains
# for the same architecture (generally for backwards-compatibility).
#
NDK_TOOLCHAIN := $(strip $(NDK_TOOLCHAIN))
ifdef NDK_TOOLCHAIN
# check that the toolchain name is supported
$(if $(filter-out $(NDK_ALL_TOOLCHAINS),$(NDK_TOOLCHAIN)),\
$(call __ndk_info,NDK_TOOLCHAIN is defined to the unsupported value $(NDK_TOOLCHAIN)) \
$(call __ndk_info,Please use one of the following values: $(NDK_ALL_TOOLCHAINS))\
$(call __ndk_error,Aborting)\
,)
$(call ndk_log, Using specific toolchain $(NDK_TOOLCHAIN))
endif
# Allow the user to define NDK_TOOLCHAIN_VERSION to override the toolchain
# version number. Unlike NDK_TOOLCHAIN, this only changes the suffix of
# the toolchain path we're using.
#
# For example, if GCC 4.8 is the default, defining NDK_TOOLCHAIN_VERSION=4.9
# will ensure that ndk-build uses the following toolchains, depending on
# the target architecture:
#
# arm -> arm-linux-androideabi-4.9
# x86 -> x86-android-linux-4.9
# mips -> mipsel-linux-android-4.9
#
# This is used in setup-toolchain.mk
#
NDK_TOOLCHAIN_VERSION := $(strip $(NDK_TOOLCHAIN_VERSION))
$(call ndk_log, This NDK supports the following target architectures and ABIS:)
$(foreach arch,$(NDK_ALL_ARCHS),\
$(call ndk_log, $(space)$(space)$(arch): $(NDK_ARCH.$(arch).abis))\
)
$(call ndk_log, This NDK supports the following toolchains and target ABIs:)
$(foreach tc,$(NDK_ALL_TOOLCHAINS),\
$(call ndk_log, $(space)$(space)$(tc): $(NDK_TOOLCHAIN.$(tc).abis))\
)