I recently updated to NDK revision 13 and also found ndk samples are now cmake + ninja based. Today 3-4 hours were consumed while trying to compile libpng but finally done it after editing CMakeLists.txt of libpng.
I tried to build libpng using Androud Studio's Gradle plugin from IDE but that was more problematic as it too required CMakeLists.txt editing and kept throwing bad link to libpng.so error. I decided to use shell which is my 1st and last choice to work in most cases. Before putting the scripts/code lets setup our work directory and data and also look at how cmake based build system compiles libpng.
Before starting ensure below tools are installed and working correctly on your system.
Build process:
Copy below bash script to create a file build.sh in libpng folder. Change the cmake, ninja, toolchain, sdk, ndk paths in script and run to build libpng. Replace the toolchain path copied through above steps. I have not tested this on Windows but using UnixUtils's sh.exe it should work.
Below is the CMakeOutput.log to check details of build environment.
Head of CMakeLists.txt file for reference
This script will build libpng for specified ABI. Change the ABI to build x86, MIPS etc binaries. Sample output binary for above script can be downloaded from here:
https://github.com/bindeshkumarsingh/android-native-libs/blob/master/armeabi-v7a_libpng-1.6.28.7z
I tried to build libpng using Androud Studio's Gradle plugin from IDE but that was more problematic as it too required CMakeLists.txt editing and kept throwing bad link to libpng.so error. I decided to use shell which is my 1st and last choice to work in most cases. Before putting the scripts/code lets setup our work directory and data and also look at how cmake based build system compiles libpng.
Before starting ensure below tools are installed and working correctly on your system.
- Android NDK revision 12+ is installed. If you have Android SDK installed but NDK is at some other location then you can move NDK inside SDK and rename it to ndk-bundle Or create a sym-link "ndk-bundle" in SDK pointing to actual NDK. After this NDK will start showing in the Android Studio 2.2+ SDK manager.
- Install cmake from SDK manager. It will get extracted in Android SDK directory.
- A good command shell. I use Ubuntu-Studio Linux with bash shell(s). Windows users can use cmd.exe or bash shell through UnixUtils.
Build process:
- Dowload libpng 1.6.28 from here http://ftp.osuosl.org/pub/blfs/conglomeration/libpng/libpng-1.6.28.tar.xz and extract to some location with shorter path without spaces. e.g. /home/username/projects/libpng in Linux or c:\work\libpng in windows. This is for convenience and avoid space related issues while compiling.
- Copy full path of android.toolchain.cmake present in NDK. Example /media/bindesh/WORK/SDK_IDE/android-ndk-r13b/build/cmake/android.toolchain.cmake. There is same named file present in ANDROID_SDK/cmake/ like this /media/bindesh/WORK/SDK_IDE/android-sdk-linux-windows/cmake/3.6.3155560/android.toolchain.cmake but we must use toolchain file present in NDK. If toolchain present in sdk/cmake is used incompatibility issues like "Invalid Android NDK revision (should be 12" can occur.
- Open libpng/CMakeLists.txt file in text editor and add include("/home/bindesh/bin/ndk/build/cmake/android.toolchain.cmake") line after project(libpng C). Change the NDK path to yours.
Copy below bash script to create a file build.sh in libpng folder. Change the cmake, ninja, toolchain, sdk, ndk paths in script and run to build libpng. Replace the toolchain path copied through above steps. I have not tested this on Windows but using UnixUtils's sh.exe it should work.
build script:
#!/bin/sh # run this script after changing the paths of ndk, sdk, cmake, ninja etc to build libpng or other cmake based library. # Don't forget to add below line in main CMakeLists.txt after project() line of code. # include("PATH_TO_NDK/build/cmake/android.toolchain.cmake") clear reset # clean previous files rm CMakeCache.txt # Change these paths and run this script to build libpng ANDROID_NDK_PATH=/home/bindesh/bin/ndk ANDROID_SDK_PATH=/home/bindesh/bin/android-sdk ANDROID_NDK=${ANDROID_NDK_PATH} ANDROID_CMAKE_PATH=${ANDROID_SDK_PATH}/cmake/3.6.3155560/bin ANDROID_CMAKE_TOOLCHAIN=${ANDROID_NDK_PATH}/build/cmake/android.toolchain.cmake # Don't use toolchain from cmake #ANDROID_CMAKE_TOOLCHAIN=/media/bindesh/WORK/SDK_IDE/android-sdk-linux-windows/cmake/3.6.3155560/android.toolchain.cmake ANDROID_API=9 ANDROID_ARCH=arm ANDROID_ABI=armeabi-v7a ANDROID_PLATFORM=android-${ANDROID_API} ANDROID_ARCH=arch-${ANDROID_ARCH} ${ANDROID_CMAKE_PATH}/cmake -DCMAKE_TOOLCHAIN_FILE=${ANDROID_CMAKE_TOOLCHAIN} -DANDROID_ABI=${ANDROID_ABI} -DANDROID_TOOLCHAIN=gcc -DANDROID_NATIVE_API_LEVEL=${ANDROID_API} -DANDROID_PLATFORM=${ANDROID_PLATFORM} -DCMAKE_MAKE_PROGRAM=${ANDROID_CMAKE_PATH}/ninja -G"Android Gradle - Ninja" #-DCMAKE_BUILD_TYPE=Release #${ANDROID_CMAKE_PATH}/cmake -DCMAKE_TOOLCHAIN_FILE=${ANDROID_CMAKE_TOOLCHAIN} -DCMAKE_MAKE_PROGRAM=${ANDROID_CMAKE_PATH}/ninja -G"Android Gradle - Ninja" -DANDROID_NDK=${ANDROID_NDK} ${ANDROID_CMAKE_PATH}/ninja #make
mv ./libpng16.a ./libpng16-${ANDROID_ABI}.a
Below is the CMakeOutput.log to check details of build environment.
Preview:
The target system is: Android - 9 - armv7-a
The host system is: Linux - 4.8.0-22-lowlatency - x86_64
Compiling the C compiler identification source file "CMakeCCompilerId.c" succeeded.
Compiler: /home/bindesh/bin/ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc
Build flags: -g;-DANDROID;-ffunction-sections;-funwind-tables;-fstack-protector-strong;-no-canonical-prefixes;-march=armv7-a;-mfloat-abi=softfp;-mfpu=vfpv3-d16;-mthumb;-Wa,--noexecstack;-Wformat;-Werror=format-security;-g;-DANDROID;-ffunction-sections;-funwind-tables;-fstack-protector-strong;-no-canonical-prefixes;-march=armv7-a;-mfloat-abi=softfp;-mfpu=vfpv3-d16;-mthumb;-Wa,--noexecstack;-Wformat;-Werror=format-security;
Id flags: -c
The output was:
0
Compilation of the C compiler identification source "CMakeCCompilerId.c" produced "CMakeCCompilerId.o"
The C compiler identification is GNU, found in "/media/bindesh/WORK/00_write/libpng-1.6.28/CMakeFiles/3.6.0-rc2/CompilerIdC/CMakeCCompilerId.o"
Determining if the C compiler works passed with the following output:
Change Dir: /media/bindesh/WORK/00_write/libpng-1.6.28/CMakeFiles/CMakeTmp
Run Build Command:"/home/bindesh/bin/android-sdk/cmake/3.6.3155560/bin/ninja" "cmTC_76f0a"
[1/2] Building C object CMakeFiles/cmTC_76f0a.dir/testCCompiler.c.o
[2/2] Linking C executable cmTC_76f0a
Detecting C compiler ABI info compiled with the following output:
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Run Build Command:"/home/bindesh/bin/android-sdk/cmake/3.6.3155560/bin/ninja" "cmTC_7ad81"
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arg [-L/home/bindesh/bin/ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/lib/armv7-a/thumb] ==> dir [/home/bindesh/bin/ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/lib/armv7-a/thumb]
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arg [-L/home/bindesh/bin/ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/../lib/gcc] ==> dir [/home/bindesh/bin/ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/../lib/gcc]
arg [-L/home/bindesh/bin/ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/lib] ==> dir [/home/bindesh/bin/ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/lib]
arg [-L/home/bindesh/bin/ndk/platforms/android-9/arch-arm/usr/lib] ==> dir [/home/bindesh/bin/ndk/platforms/android-9/arch-arm/usr/lib]
arg [--build-id] ==> ignore
arg [--warn-shared-textrel] ==> ignore
arg [--fatal-warnings] ==> ignore
arg [--fix-cortex-a8] ==> ignore
arg [--no-undefined] ==> ignore
arg [-znoexecstack] ==> ignore
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arg [-lgcc] ==> lib [gcc]
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arg [-ldl] ==> lib [dl]
arg [-lgcc] ==> lib [gcc]
arg [/home/bindesh/bin/ndk/platforms/android-9/arch-arm/usr/lib/crtend_android.o] ==> ignore
remove lib [gcc]
remove lib [gcc]
collapse library dir [/home/bindesh/bin/ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9.x/armv7-a/thumb] ==> [/home/bindesh/bin/ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/armv7-a/thumb]
collapse library dir [/home/bindesh/bin/ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/lib/armv7-a/thumb] ==> [/home/bindesh/bin/ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/arm-linux-androideabi/lib/armv7-a/thumb]
collapse library dir [/home/bindesh/bin/ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9.x] ==> [/home/bindesh/bin/ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/lib/gcc/arm-linux-androideabi/4.9.x]
collapse library dir [/home/bindesh/bin/ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/../lib/gcc] ==> [/home/bindesh/bin/ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/lib/gcc]
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Detecting C [-std=c11] compiler features compiled with the following output:
Change Dir: /media/bindesh/WORK/00_write/libpng-1.6.28/CMakeFiles/CMakeTmp
Run Build Command:"/home/bindesh/bin/android-sdk/cmake/3.6.3155560/bin/ninja" "cmTC_5d10b"
[1/2] Building C object CMakeFiles/cmTC_5d10b.dir/feature_tests.c.o
[2/2] Linking C executable cmTC_5d10b
Feature record: C_FEATURE:1c_function_prototypes
Feature record: C_FEATURE:1c_restrict
Feature record: C_FEATURE:1c_static_assert
Feature record: C_FEATURE:1c_variadic_macros
Detecting C [-std=c99] compiler features compiled with the following output:
Change Dir: /media/bindesh/WORK/00_write/libpng-1.6.28/CMakeFiles/CMakeTmp
Run Build Command:"/home/bindesh/bin/android-sdk/cmake/3.6.3155560/bin/ninja" "cmTC_bb98c"
[1/2] Building C object CMakeFiles/cmTC_bb98c.dir/feature_tests.c.o
[2/2] Linking C executable cmTC_bb98c
Feature record: C_FEATURE:1c_function_prototypes
Feature record: C_FEATURE:1c_restrict
Feature record: C_FEATURE:0c_static_assert
Feature record: C_FEATURE:1c_variadic_macros
Detecting C [-std=c90] compiler features compiled with the following output:
Change Dir: /media/bindesh/WORK/00_write/libpng-1.6.28/CMakeFiles/CMakeTmp
Run Build Command:"/home/bindesh/bin/android-sdk/cmake/3.6.3155560/bin/ninja" "cmTC_f387f"
[1/2] Building C object CMakeFiles/cmTC_f387f.dir/feature_tests.c.o
[2/2] Linking C executable cmTC_f387f
Feature record: C_FEATURE:1c_function_prototypes
Feature record: C_FEATURE:0c_restrict
Feature record: C_FEATURE:0c_static_assert
Feature record: C_FEATURE:0c_variadic_macros
Performing C SOURCE FILE Test HAVE_LD_VERSION_SCRIPT succeeded with the following output:
Change Dir: /media/bindesh/WORK/00_write/libpng-1.6.28/CMakeFiles/CMakeTmp
Run Build Command:"/home/bindesh/bin/android-sdk/cmake/3.6.3155560/bin/ninja" "cmTC_d0d1b"
[1/2] Building C object CMakeFiles/cmTC_d0d1b.dir/src.c.o
[2/2] Linking C executable cmTC_d0d1b
Source file was:
void sym(void) {}
void sym2(void) {}
int main(void) {return 0;}
Head of CMakeLists.txt file for reference
# CMakeLists.txt # Copyright (C) 2007,2009-2016 Glenn Randers-Pehrson # Written by Christian Ehrlicher, 2007 # Revised by Roger Lowman, 2009-2010 # Revised by Clifford Yapp, 2011-2012 # Revised by Roger Leigh, 2016 # Revised by Andreas Franek, 2016 # This code is released under the libpng license. # For conditions of distribution and use, see the disclaimer # and license in png.h cmake_minimum_required(VERSION 2.8.3) cmake_policy(VERSION 2.8.3) # Set MacOSX @rpath usage globally. if (POLICY CMP0020) cmake_policy(SET CMP0020 NEW) endif(POLICY CMP0020) if (POLICY CMP0042) cmake_policy(SET CMP0042 NEW) endif(POLICY CMP0042) # Use new variable expansion policy. if (POLICY CMP0053) cmake_policy(SET CMP0053 NEW) endif(POLICY CMP0053) if (POLICY CMP0054) cmake_policy(SET CMP0054 NEW) endif(POLICY CMP0054) set(CMAKE_CONFIGURATION_TYPES "Release;Debug;MinSizeRel;RelWithDebInfo") project(libpng C) enable_testing() set(PNGLIB_MAJOR 1) set(PNGLIB_MINOR 6) set(PNGLIB_RELEASE 28) set(PNGLIB_NAME libpng${PNGLIB_MAJOR}${PNGLIB_MINOR}) set(PNGLIB_VERSION ${PNGLIB_MAJOR}.${PNGLIB_MINOR}.${PNGLIB_RELEASE}) include("/home/bindesh/bin/ndk/build/cmake/android.toolchain.cmake") # needed packages #Allow users to specify location of Zlib, # Useful if zlib is being built alongside this as a sub-project option(PNG_BUILD_ZLIB "Custom zlib Location, else find_package is used" OFF)
This script will build libpng for specified ABI. Change the ABI to build x86, MIPS etc binaries. Sample output binary for above script can be downloaded from here:
https://github.com/bindeshkumarsingh/android-native-libs/blob/master/armeabi-v7a_libpng-1.6.28.7z
