Question

I need libjpeg-turbo for android ndk. Did anyone managed to compile it as .a (static) lib? I have tried a few times, but it gave me a lot of errors only.

Was it helpful?

Solution

Install Android NDK. Following instructions were verified with r8b, older versions may have problems, I don't know.

Get the Android sources for libjpeg-turbo from Benjamin Gaignard:

git clone git://git.linaro.org/people/tomgall/libjpeg-turbo/libjpeg-turbo.git -b linaro-android

In the libjpeg-turbo directory created by git, edit file Android.mk: after line 70, LOCAL_MODULE := libjpeg, add the following:

ifeq ($(notdir $(MAKECMDGOALS)),libjpeg.a)
  LOCAL_SRC_FILES +=  $(libsimd_SOURCES_DIST)
  include $(BUILD_STATIC_LIBRARY)
  include $(CLEAR_VARS)
  LOCAL_MODULE := dummy
endif

Run ndk-build:

ndk-build NDK_PROJECT_PATH=. APP_BUILD_SCRIPT=./Android.mk obj/local/armeabi/libjpeg.a

Profit!

PS: You may want the armeabi-v7a version:

ndk-build NDK_PROJECT_PATH=. APP_BUILD_SCRIPT=./Android.mk APP_ABI=armeabi-v7a obj/local/armeabi-v7a/libjpeg.a

Or compile for ARM, to improve performance, add to command line:

LOCAL_ARM_MODE=arm

If your target has NEON support, add to command line:

LOCAL_ARM_NEON=true ARCH_ARM_HAVE_NEON=true

UPDATE: to get it work with Android NDK r15 and later, remove all references to libcutils from Android.mk.

OTHER TIPS

This answer expands on Alex Cohn's answer. Full credit goes to him for getting me started. This answer will allow you to build libjpeg-turbo with assembly for ARM (with or without NEON) as well as x86. Compatibility is also provided for MIPS so that you can be a good citizen and build your app for all of the platforms that the r8e version of the Android NDK supports.

I still a relative newbie to actually answering questions, so don't have permissions to include attachments. So I'm going to have to inline a bunch of code. I'm also sure there are better ways to do bits and pieces of the below, so am open to suggestions for improvement.

Getting this all to work was done in six main steps (step two has many sub-steps -- each of which can be found after the main six steps):

  1. Download via git the libjpeg-turbo library containing a set of code and .mk files for Android. I downloaded it from here with git:

    git clone git://git.linaro.org/people/tomgall/libjpeg-turbo/libjpeg-turbo.git -b linaro-android

    Full credit and thanks must be given to Tom Gall for doing the initial work.

  2. Download YASM (an assembler for x86) and configure the Android build environment to support it. See the set of instructions on configuring YASM for the Android NDK that I am including below the horizontal rule at the end of my Android.mk changes in step 6. Supporting x86 requires that you aren't shy about tweaking the NDK install.

    I perhaps could have used the NASM compiler, but was far enough down the YASM path before investigating NASM that I brought the YASM path to completion.

  3. Create the simd/jsmidcfg.inc file. The libjpeg-turbo library provides simd/jsmidcfg.inc.h. It is meant for the pre-processor to take the .h and convert it to a .inc. I'm sure there is a better way for it to happen than what I did. But couldn't get it sorted out due to time pressures. Instead, I manually ran one the gcc that came with Android to create the file using the following command:

    C:\development\android\ide\android-ndk-r8e-windows-x86_64\toolchains\x86-4.4.3\prebuilt\windows-x86_64\bin\i686-linux-android-gcc.exe -E C:\development\thirdparty\libjpeg-turbo\libjpeg-turbo-android-1.2.0\simd\jsimdcfg.inc.h -o C:\development\thirdparty\libjpeg-turbo\libjpeg-turbo-android1.2.0\simd\jsimdcfg.inc

    After the pre-processor completed, I had to hand-edit the file to get it into a usable state. I had to select all of the lines above "; -- jpeglib.h" and delete them.

    Next, I had to find each of the %defines that started with _cpp_protection_ and duplicate each of those %defines WITHOUT the _cpp_protection_. For example, %define _cpp_protection_RGB_RED 0 became %define RGB_RED 0

  4. For ARM, I wanted my code to dynamically support NEON instructions on hardware that had it, and to fallback to something simpler on hardware that didn't, I modified simd/jsimd_arm.c to dynamically query for the information. I didn't want to have to make that choice when building libjpeg-turbo.

    I added the following lines of code:

    #ifdef ANDROID
#include <cpufeatures/cpu-features.h>
#endif

    and

    #ifdef ANDROID
  uint64_t cpuFeatures = android_getCpuFeatures();
  if (cpuFeatures & ANDROID_CPU_ARM_FEATURE_NEON) {
     simd_support |= JSIMD_ARM_NEON;
  }
#endif

    within the init_simd() method.

  5. Enabling MIPS.

    To be a good citizen, I wanted to enable compilation on MIPS. While there isn't any assembler code for MIPS, the code should at least compile and run. To do that, I copied simd/jsimd_arm.c to simd/jsimd_mips.c. I edited the file so that init_simd() set simd_support = 0; I also changed all of the jsimd_can_*() methods to return 0. Finally, I removed the implementation from all of the other methods.

  6. Because I was interested in more than just a build for ARM, I changed the Application.mk file to include the following lines:

    APP_ABI := all
APP_OPTIM := release

    The APP_OPTIM comes from How to optimize a native code with android-ndk (Speed Optimization)

    Within Android.mk, I commented out everything from the "cjpeg" comment block and below. To do a block comment, I followed the advice of How to add multi line comments in makefiles

    I next customized the Android.mk file itself so that I could build for all currently supported CPUs (ARM, x86, MIPS). Here is what I ended up with (some code commented out because I wanted a static library -- also to leave the original code in place so I can see what changed). You will most likely have to change (or remove) the addprefix method calls because the file below is customized for my build environment. But other than that, it should work for you.

.

##################################################
###                simd                        ###
##################################################
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)

#ifeq ($(ARCH_ARM_HAVE_NEON),true)
#LOCAL_CFLAGS += -D__ARM_HAVE_NEON
#endif

# From autoconf-generated Makefile
EXTRA_DIST = simd/nasm_lt.sh simd/jcclrmmx.asm simd/jcclrss2.asm simd/jdclrmmx.asm simd/jdclrss2.asm \
simd/jdmrgmmx.asm simd/jdmrgss2.asm simd/jcclrss2-64.asm simd/jdclrss2-64.asm \
simd/jdmrgss2-64.asm simd/CMakeLists.txt

#libsimd_SOURCES_DIST = simd/jsimd_arm_neon.S \
                       simd/jsimd_arm.c

libsimd_SOURCES_DIST :=


ifeq ($(TARGET_ARCH),arm)
libsimd_SOURCES_DIST := simd/jsimd_arm_neon.S \
                       simd/jsimd_arm.c
endif

ifeq ($(TARGET_ARCH),x86)
#libsimd_SOURCES_DIST := simd/jsimd_mips.c

# List of assembly files needed is derived from content within simd/CMakelists.txt
# The Intel Atom supports x86 32-bit assembly.  So take those files and leave the
# 64-bit behind.

libsimd_SOURCES_DIST := simd/jsimd_i386.c \
simd/jsimdcpu.asm simd/jccolmmx.asm simd/jcgrammx.asm simd/jdcolmmx.asm simd/jcsammmx.asm simd/jdsammmx.asm \
    simd/jdmermmx.asm simd/jcqntmmx.asm simd/jfmmxfst.asm simd/jfmmxint.asm simd/jimmxred.asm simd/jimmxint.asm simd/jimmxfst.asm simd/jcqnt3dn.asm \
    simd/jf3dnflt.asm simd/ji3dnflt.asm simd/jcqntsse.asm simd/jfsseflt.asm simd/jisseflt.asm simd/jccolss2.asm simd/jcgrass2.asm simd/jdcolss2.asm \
    simd/jcsamss2.asm simd/jdsamss2.asm simd/jdmerss2.asm simd/jcqnts2i.asm simd/jfss2fst.asm simd/jfss2int.asm simd/jiss2red.asm simd/jiss2int.asm \
    simd/jiss2fst.asm simd/jcqnts2f.asm simd/jiss2flt.asm
endif

ifeq ($(TARGET_ARCH),mips)
libsimd_SOURCES_DIST := simd/jsimd_mips.c
endif


#LOCAL_SRC_FILES := $(libsimd_SOURCES_DIST)
#LOCAL_SRC_FILES := $(addprefix ../../libjpeg-turbo-android-1.2.0/,$(LOCAL_SRC_FILES))

LOCAL_C_INCLUDES := $(LOCAL_PATH)/simd \
                    $(LOCAL_PATH)/android

LOCAL_C_INCLUDES := simd android
#LOCAL_C_INCLUDES := $(addprefix ../../libjpeg-turbo-android-1.2.0/,$(LOCAL_C_INCLUDES))


#AM_CFLAGS := -march=armv7-a -mfpu=neon
#AM_CCASFLAGS := -march=armv7-a -mfpu=neon

#LOCAL_MODULE_TAGS := debug

#LOCAL_MODULE := libsimd

#include $(BUILD_STATIC_LIBRARY)

######################################################
###           libjpeg.so                       ##
######################################################

#include $(CLEAR_VARS)

# From autoconf-generated Makefile
libjpeg_SOURCES_DIST =  jcapimin.c jcapistd.c jccoefct.c jccolor.c \
        jcdctmgr.c jchuff.c jcinit.c jcmainct.c jcmarker.c jcmaster.c \
        jcomapi.c jcparam.c jcphuff.c jcprepct.c jcsample.c jctrans.c \
        jdapimin.c jdapistd.c jdatadst.c jdatasrc.c jdcoefct.c jdcolor.c \
        jddctmgr.c jdhuff.c jdinput.c jdmainct.c jdmarker.c jdmaster.c \
        jdmerge.c jdphuff.c jdpostct.c jdsample.c jdtrans.c jerror.c \
        jfdctflt.c jfdctfst.c jfdctint.c jidctflt.c jidctfst.c jidctint.c \
        jidctred.c jquant1.c jquant2.c jutils.c jmemmgr.c jmemnobs.c \
jaricom.c jcarith.c jdarith.c \
turbojpeg.c transupp.c jdatadst-tj.c jdatasrc-tj.c #\
turbojpeg-mapfile

LOCAL_SRC_FILES:= $(libjpeg_SOURCES_DIST) $(libsimd_SOURCES_DIST)
#LOCAL_SRC_FILES:= $(libjpeg_SOURCES_DIST)
LOCAL_SRC_FILES := $(addprefix ../../../libjpeg-turbo-android-1.2.0/,$(LOCAL_SRC_FILES))

#LOCAL_SHARED_LIBRARIES := libcutils
#LOCAL_STATIC_LIBRARIES := libsimd

#LOCAL_C_INCLUDES := $(LOCAL_PATH) 

# Include C:/development/android/ide/android-ndk-r8e-windows-x86_64/sources/android
# instead of the lower-level cpufeatures because of how I had to include
# cpu-features.h.  It appears as if there is a naming conflict, so I had to
# change how the file was included to avoid naming conflicts.

LOCAL_C_INCLUDES := $(addprefix ../../../libjpeg-turbo-android-1.2.0/,$(LOCAL_C_INCLUDES)) \
C:/development/thirdparty/libjpeg-turbo/libjpeg-turbo-android-1.2.0 \
C:/development/android/ide/android-ndk-r8e-windows-x86_64/sources/android
#LOCAL_C_INCLUDES := $(LOCAL_C_INCLUDES)) ./
#LOCAL_C_INCLUDES := $(addprefix $(LOCAL_PATH),$(LOCAL_C_INCLUDES)) $(LOCAL_PATH)../../../libjpeg-turbo-android-1.2.0/

LOCAL_CFLAGS := -DAVOID_TABLES  -O3 -fstrict-aliasing -fprefetch-loop-arrays  -DANDROID \
        -DANDROID_TILE_BASED_DECODE -DENABLE_ANDROID_NULL_CONVERT
LOCAL_CFLAGS += -DJPEG_LIB_VERSION=80  # I need version 8 because of some of the methods I depend on
LOCAL_YASMFLAGS := -P../../libjpeg-turbo-android-1.2.0/simd/jsimdcfg.inc

#LOCAL_MODULE_PATH := $(TARGET_OUT_OPTIONAL_STATIC_LIBRARY)

#LOCAL_MODULE_TAGS := debug

#LOCAL_MODULE := libjpeg
LOCAL_MODULE := jpeg-turbo

#include $(BUILD_SHARED_LIBRARY)
#LOCAL_STATIC_LIBRARIES := cpufeatures

include $(BUILD_STATIC_LIBRARY)

# We reference android/cpufeatures in the Android.mk file of our main app, so
# we don't need to do anything here.
#$(call import-module,android/cpufeatures)

Some of the source code that ships with libjpeg-turbo is in .asm format. That is, it needs to be compiled with the NASM assembler. As it ships, the Android NDK doesn't have support for it.

To get .asm support working with NDK, I followed the rough outline presented here: http://software.intel.com/en-us/articles/using-yasm-compiler-on-android-ndkbuild

Here are a set of more detailed instructions. Within android-ndk-r8\build\core, the following things need to occur:

  1. build-binary.mk:

    all_source_extensions := .c .s .S $(LOCAL_CPP_EXTENSION) => all_source_extensions := .c .s .asm .S $(LOCAL_CPP_EXTENSION)

    For me, the above was on line 228.

    After the line that starts with: "# Build the sources to object files" you will see several foreach loops. Add one like this (I added it on line 272):

    $(foreach src,$(filter %.asm,$(LOCAL_SRC_FILES)), $(call compile-asm-source,$(src),$(call get-object-name,$(src))))

  2. definitions.mk:

    Create a new compile-asm-source to match the new entry we added within the new for loop above. We also have to add a new define within the make file. I added the following. It is a combination and simplification of the various rules used to build .c files. We need a different set of options when using yasm that necessitate these changes.

    define  ev-compile-asm-source
_SRC:=$$(LOCAL_PATH)/$(1)
_OBJ:=$$(LOCAL_OBJS_DIR)/$(2)

_FLAGS := -f elf -DELF -DPIC $$(LOCAL_YASMFLAGS)

_TEXT := "Compile $$(call get-src-file-text,$1)"
_CC   := $$(NDK_CCACHE) $$(TARGET_ASM)

$$(_OBJ): PRIVATE_SRC      := $$(_SRC)
$$(_OBJ): PRIVATE_OBJ      := $$(_OBJ)
$$(_OBJ): PRIVATE_DEPS     := $$(call host-path,$$(_OBJ).d)
$$(_OBJ): PRIVATE_MODULE   := $$(LOCAL_MODULE)
$$(_OBJ): PRIVATE_TEXT     := "$$(_TEXT)"
$$(_OBJ): PRIVATE_CC       := $$(_CC)
$$(_OBJ): PRIVATE_CFLAGS   := $$(_FLAGS)

ifeq ($$(LOCAL_SHORT_COMMANDS),true)
_OPTIONS_LISTFILE := $$(_OBJ).cflags
$$(_OBJ): $$(call generate-list-file,$$(_FLAGS),$$(_OPTIONS_LISTFILE))
$$(_OBJ): PRIVATE_CFLAGS := @$$(call host-path,$$(_OPTIONS_LISTFILE))
$$(_OBJ): $$(_OPTIONS_LISTFILE)
endif

$$(call generate-file-dir,$$(_OBJ))

$$(_OBJ): $$(_SRC) $$(LOCAL_MAKEFILE) $$(NDK_APP_APPLICATION_MK) $$(NDK_DEPENDENCIES_CONVERTER)
@$$(HOST_ECHO) "$$(PRIVATE_TEXT)  : $$(PRIVATE_MODULE) <= $$(notdir $$(PRIVATE_SRC))"
$$(hide) $$(PRIVATE_CC) $$(PRIVATE_CFLAGS) $$(call host-path,$$(PRIVATE_SRC)) -o $$(call host-path,$$(PRIVATE_OBJ)) \
$$(call cmd-convert-deps,$$(PRIVATE_DEPS))
endef

compile-asm-source = $(eval $(call ev-compile-asm-source,$1,$2))

    Search for the line that starts with 'compile-s-source'. I found it at line 1491. The new compile-asm-source can go right below that.

    Next, search for the line that starts with "get-object-name". I found it at line 1270. Add ".asm" to the inner for-loop. Put it together with the .c, .s, and .S

  3. import-locals.mk:

    Add the following line below the LOCAL_CFLAGS and the LOCAL_CPPFLAGS line

    LOCAL_YASMFLAGS  := $(LOCAL_CFLAGS) $(strip $(LOCAL_YASMFLAGS))

  4. default-build-commands.mk:

    Add the following line anywhere in the file. I put mine under the TARGET_CXX section and above the TARGET_LD section.

    TARGET_ASM       = $(TOOLCHAIN_PREFIX)yasm

  5. Download and copy yasm.exe to the build folders:

    Download a copy of YASM from here: http://yasm.tortall.net/

    I have the Win64 version of the NDK, so downloaded the Win64 version of YASM. If you have the Win32 version of the NDS, download th Win32 version of YASM.

    You should just get the .exe. Copy it to the following directories as yasm.exe. If you have any other toolchain versions, copy it to those directories as well:

    C:\development\android\ide\android-ndk-r8e-windows-x86_64\toolchains\x86-4.4.3\prebuilt\windows-x86_64\i686-linux-android\bin

C:\development\android\ide\android-ndk-r8e-windows-x86_64\toolchains\x86-4.6\prebuilt\windows-x86_64\i686-linux-android\bin

C:\development\android\ide\android-ndk-r8e-windows-x86_64\toolchains\x86-4.7\prebuilt\windows-x86_64\i686-linux-android\bin

    Then, copy the file again to the directories below as i686-linux-android-yasm.exe. And as above, if you have any other toolchain versions, copy it to those directories as well:

    C:\development\android\ide\android-ndk-r8e-windows-x86_64\toolchains\x86-4.4.3\prebuilt\windows-x86_64\bin

C:\development\android\ide\android-ndk-r8e-windows-x86_64\toolchains\x86-4.6\prebuilt\windows-x86_64\bin

C:\development\android\ide\android-ndk-r8e-windows-x86_64\toolchains\x86-4.7\prebuilt\windows-x86_64\bin

Thanks Alex Cohn and answered Dec for share;

This answer expands on Alex Cohn's answer & answered Dec's answer;

I'm use jpeg turbo 1.3.9, ndk-r9d, about yasm.exe, the ndk-r9d is contained, on after did answered Dec's step 3, I had one error in simd/jsimdext.inc line:182 "%define EXTN(name) _ %+ name ; foo() -> _foo"; change it to "%define EXTN(name) name"; then ok, this problem had fixed;

this is my Android.mk

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)

LOCAL_CFLAGS += -D__ARM_HAVE_NEON

#ifeq ($(ARCH_ARM_HAVE_NEON),true)
#LOCAL_CFLAGS += -D__ARM_HAVE_NEON
#endif

# From autoconf-generated Makefile
EXTRA_DIST = nasm_lt.sh CMakeLists.txt \
    jccolext-mmx.asm   jcgryext-mmx.asm   jdcolext-mmx.asm   jdmrgext-mmx.asm \
    jccolext-sse2.asm  jcgryext-sse2.asm  jdcolext-sse2.asm  jdmrgext-sse2.asm \
    jccolext-sse2-64.asm  jcgryext-sse2-64.asm  jdcolext-sse2-64.asm \
    jdmrgext-sse2-64.asm



ifeq ($(TARGET_ARCH),arm)
libsimd_SOURCES_DIST := simd/jsimd_arm_neon.S \
                       simd/jsimd_arm.c

AM_CFLAGS := -march=armv7-a -mfpu=neon
AM_CCASFLAGS := -march=armv7-a -mfpu=neon

endif

ifeq ($(TARGET_ARCH),x86)
# List of assembly files needed is derived from content within simd/CMakelists.txt
# The Intel Atom supports x86 32-bit assembly.  So take those files and leave the
# 64-bit behind.

#libsimd_SOURCES_DIST := simd/jsimd_i386.c \
    simd/jsimdcpu.asm \
    simd/jfdctflt-3dn.asm \
    simd/jidctflt-3dn.asm \
    simd/jquant-3dn.asm \
    simd/jccolor-mmx.asm \
    simd/jcgray-mmx.asm \
    simd/jcsample-mmx.asm \
    simd/jdcolor-mmx.asm \
    simd/jdmerge-mmx.asm \
    simd/jdsample-mmx.asm \
    simd/jfdctfst-mmx.asm \
    simd/jfdctint-mmx.asm \
    simd/jidctfst-mmx.asm \
    simd/jidctint-mmx.asm \
    simd/jidctred-mmx.asm \
    simd/jquant-mmx.asm \
    simd/jfdctflt-sse.asm \
    simd/jidctflt-sse.asm \
    simd/jquant-sse.asm \
    simd/jccolor-sse2.asm \
    simd/jcgray-sse2.asm \
    simd/jcsample-sse2.asm \
    simd/jdcolor-sse2.asm \
    simd/jdmerge-sse2.asm \
    simd/jdsample-sse2.asm \
    simd/jfdctfst-sse2.asm \
    simd/jfdctint-sse2.asm \
    simd/jidctflt-sse2.asm \
    simd/jidctfst-sse2.asm \
    simd/jidctint-sse2.asm \
    simd/jidctred-sse2.asm \
    simd/jquantf-sse2.asm \
    simd/jquanti-sse2.asm

libsimd_SOURCES_DIST := simd/jsimd_i386.c simd/jsimd.h simd/jsimdcfg.inc.h simd/jsimdext.inc \
    simd/jcolsamp.inc simd/jdct.inc simd/jsimdcpu.asm \
    simd/jfdctflt-3dn.asm   simd/jidctflt-3dn.asm   simd/jquant-3dn.asm \
    simd/jccolor-mmx.asm    simd/jcgray-mmx.asm     simd/jcsample-mmx.asm \
    simd/jdcolor-mmx.asm    simd/jdmerge-mmx.asm    simd/jdsample-mmx.asm \
    simd/jfdctfst-mmx.asm   simd/jfdctint-mmx.asm   simd/jidctfst-mmx.asm \
    simd/jidctint-mmx.asm   simd/jidctred-mmx.asm   simd/jquant-mmx.asm \
    simd/jfdctflt-sse.asm   simd/jidctflt-sse.asm   simd/jquant-sse.asm \
    simd/jccolor-sse2.asm   simd/jcgray-sse2.asm    simd/jcsample-sse2.asm \
    simd/jdcolor-sse2.asm   simd/jdmerge-sse2.asm   simd/jdsample-sse2.asm \
    simd/jfdctfst-sse2.asm  simd/jfdctint-sse2.asm  simd/jidctflt-sse2.asm \
    simd/jidctfst-sse2.asm  simd/jidctint-sse2.asm  simd/jidctred-sse2.asm  \
    simd/jquantf-sse2.asm   simd/jquanti-sse2.asm
endif

ifeq ($(TARGET_ARCH),mips)
libsimd_SOURCES_DIST := simd/jsimd_mips.c
endif

LOCAL_C_INCLUDES := $(LOCAL_PATH)/simd \
                    $(LOCAL_PATH)/android

LOCAL_SRC_FILES:= $(libsimd_SOURCES_DIST)

LOCAL_CFLAGS := -DAVOID_TABLES  -O3 -fstrict-aliasing -fprefetch-loop-arrays  -DANDROID \
        -DANDROID_TILE_BASED_DECODE -DENABLE_ANDROID_NULL_CONVERT
LOCAL_CFLAGS += -DJPEG_LIB_VERSION=80  # I need version 8 because of some of the methods I depend on

$(warning "libsimd")
LOCAL_MODULE := libsimd
LOCAL_MODULE_FILENAME := libsimd
include $(BUILD_STATIC_LIBRARY)

######################################################
###           libjpeg.so                       ##
######################################################

#include $(CLEAR_VARS)

# From autoconf-generated Makefile
libjpeg_SOURCES_DIST =  jcapimin.c jcapistd.c jccoefct.c jccolor.c \
        jcdctmgr.c jchuff.c jcinit.c jcmainct.c jcmarker.c jcmaster.c \
        jcomapi.c jcparam.c jcphuff.c jcprepct.c jcsample.c jctrans.c \
        jdapimin.c jdapistd.c jdatadst.c jdatasrc.c jdcoefct.c jdcolor.c \
        jddctmgr.c jdhuff.c jdinput.c jdmainct.c jdmarker.c jdmaster.c \
        jdmerge.c jdphuff.c jdpostct.c jdsample.c jdtrans.c jerror.c \
        jfdctflt.c jfdctfst.c jfdctint.c jidctflt.c jidctfst.c jidctint.c \
        jidctred.c jquant1.c jquant2.c jutils.c jmemmgr.c jmemnobs.c \
    jaricom.c jcarith.c jdarith.c \
    turbojpeg.c transupp.c jdatadst-tj.c jdatasrc-tj.c \
    turbojpeg-mapfile

LOCAL_SRC_FILES:= $(libjpeg_SOURCES_DIST)

LOCAL_SHARED_LIBRARIES += libcutils
LOCAL_STATIC_LIBRARIES += libsimd

LOCAL_C_INCLUDES := $(LOCAL_PATH) 



$(warning "libjpeg")

LOCAL_CFLAGS := -DAVOID_TABLES  -O3 -fstrict-aliasing -fprefetch-loop-arrays  -DANDROID \
        -DANDROID_TILE_BASED_DECODE -DENABLE_ANDROID_NULL_CONVERT
LOCAL_CFLAGS += -DJPEG_LIB_VERSION=80  # I need version 8 because of some of the methods I depend on

#D:\android-ndk-r9d\toolchains\x86-4.8\prebuilt\windows-x86_64\bin\i686-linux-android-gcc.exe -E D:\WORKSPACE\MINE\libjpeg_turbo_1.3.9_multi_platform\jni\simd\jsimdcfg.inc.h -o D:\WORKSPACE\MINE\libjpeg_turbo_1.3.9_multi_platform\jni\simd\jsimdcfg.inc

LOCAL_MODULE := libjpeg
LOCAL_MODULE_FILENAME:=libjpeg

LOCAL_STATIC_LIBRARIES += cpufeatures

include $(BUILD_STATIC_LIBRARY)

For anyone trying to build the official repo version, I had success using the patch attached here: libjpeg-turbo cross-compile to Android fails.

Then, depending on whether you're compiling for 32-bit or 64-bit:

export CFLAGS="-DSIZEOF_SIZE_T=4"

or

export CFLAGS="-DSIZEOF_SIZE_T=4"

And run cmake with -DWITH_SIMD=FALSE -DCMAKE_TOOLCHAIN_FILE=your_toolchain_file.

Of course, I'm aware that disabling SIMD is not ideal, but at least I managed to get a build I can start using. Hopefully, the buildsystem's NEON SIMD support will get fixed, in the future. Using ./configure also failed to build the correct SIMD for ARM.

Incidentally, I wish folks would contribute fixes to the main repo, rather than simply forking it. It's been 2 years since the last change to the repo cited in alex-cohn's answer.

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