Cross Build nghttp2 for Andriod

Build Environment Prepare

If you wan to build nghttp2 for andriod you shoud do two things. Frist you should get nghttp2 source code, second you need to configure your build environment.

Get Nghttp2-v1.41 Source Code

• The nghttp2 source web site at:
  https://github.com/nghttp2/nghttp2

• Get libevent sorce code
  git clone https://github.com/nghttp2/nghttp2.git after you clone you need to switch to a stable tag like v1.4.1.

Get Andriod NDK and Configure Environment Variable.

• NDK cross build tools web site at:
  https://developer.android.google.cn/ndk/downloads/index.html
• Set NDK Environment Variable
  export NDK_HOME=/home/heyongxin/android-ndk-r16b
• Openssl and libcrpto Note
  if you wan to use libevent_openssl.a, you need to set openssl include path in build scripts. My computer have make and install libevent in defaut path so i don’t need set it.

Writing the Build Scripts

Arm64-v8a and Armeabi-v7a chip arch hvave covered the most device in the market. so we only provide Arm64-v8a arch’s build script,the armeabi-v7a’s build scripts reference the v8a.

The Target Device for Arm64-v8a

#!/bin/sh
export ANDROID_NDK_ROOT=/home/heyongxin/android-ndk-r16b
NDK=/home/heyongxin/android-ndk-r16b
NGHTTP2_TMP_FOLDER=$PWD
NGHTTP2_TARGET_API=android-23
NGHTTP2_GCC_VERSION=4.9
NGHTTP2_OUTPUT_PATH=$PWD/nghttp2_build
rm -rf $NGHTTP2_OUTPUT_PATH
mkdir -p $NGHTTP2_OUTPUT_PATH
mkdir -p $NGHTTP2_TMP_FOLDER/android-toolchain-aarch64
NDK_MAKE_TOOLCHAIN=$NDK/build/tools/make-standalone-toolchain.sh
${NDK_MAKE_TOOLCHAIN} \
    --platform=${NGHTTP2_TARGET_API} \
    --arch=arm64 \
    --toolchain=aarch64-linux-android-${NGHTTP2_GCC_VERSION} \
    --install-dir="${NGHTTP2_TMP_FOLDER}/android-toolchain-aarch64" \
    --force
export TOOLCHAIN_PATH="${NGHTTP2_TMP_FOLDER}/android-toolchain-aarch64/bin"
export TOOL=aarch64-linux-android
export NDK_TOOLCHAIN_BASENAME=${TOOLCHAIN_PATH}/${TOOL}
export CC=${NDK_TOOLCHAIN_BASENAME}-gcc
export CXX=${NDK_TOOLCHAIN_BASENAME}-g++
export LINK=${CXX}
export LD=${NDK_TOOLCHAIN_BASENAME}-ld
export AR=${NDK_TOOLCHAIN_BASENAME}-ar
export RANLIB=${NDK_TOOLCHAIN_BASENAME}-ranlib
export STRIP=${NDK_TOOLCHAIN_BASENAME}-strip
export ARCH_FLAGS=
export ARCH_LINK=
export CPPFLAGS=" ${ARCH_FLAGS} -fpic -ffunction-sections -funwind-tables -fstack-protector -fno-strict-aliasing -finline-limit=64 "
export CXXFLAGS=" ${ARCH_FLAGS} -fpic -ffunction-sections -funwind-tables -fstack-protector -fno-strict-aliasing -finline-limit=64 -frtti -fexceptions "
export CFLAGS=" ${ARCH_FLAGS} -fpic -ffunction-sections -funwind-tables -fstack-protector -fno-strict-aliasing -finline-limit=64 "
export LDFLAGS=" ${ARCH_LINK} "
cd ${NGHTTP2_TMP_FOLDER}
echo $CC
./configure --host=aarch64-linux-android  --disable-shared --enable-static 
make 

The Arch for Armeabi-v7a

#!/bin/sh
export ANDROID_NDK_ROOT=/home/heyongxin/android-ndk-r16b
NDK=/home/heyongxin/android-ndk-r16b
NGHTTP2_TMP_FOLDER=$PWD
NGHTTP2_TARGET_API=android-23
NGHTTP2_GCC_VERSION=4.9
NGHTTP2_OUTPUT_PATH=$PWD/nghttp2_build
rm -rf $NGHTTP2_OUTPUT_PATH
mkdir -p $NGHTTP2_OUTPUT_PATH
mkdir -p $NGHTTP2_TMP_FOLDER/android-toolchain-arm
NDK_MAKE_TOOLCHAIN=$NDK/build/tools/make-standalone-toolchain.sh
${NDK_MAKE_TOOLCHAIN} \
    --platform=${NGHTTP2_TARGET_API} \
    --arch=arm \
    --toolchain=arm-linux-androideabi-${NGHTTP2_GCC_VERSION} \
    --install-dir="${NGHTTP2_TMP_FOLDER}/android-toolchain-arm" \
    --force
export TOOLCHAIN_PATH="${NGHTTP2_TMP_FOLDER}/android-toolchain-arm/bin"
export TOOL=arm-linux-androideabi
export NDK_TOOLCHAIN_BASENAME=${TOOLCHAIN_PATH}/${TOOL}
export CC=${NDK_TOOLCHAIN_BASENAME}-gcc
export CXX=${NDK_TOOLCHAIN_BASENAME}-g++
export LINK=${CXX}
export LD=${NDK_TOOLCHAIN_BASENAME}-ld
export AR=${NDK_TOOLCHAIN_BASENAME}-ar
export RANLIB=${NDK_TOOLCHAIN_BASENAME}-ranlib
export STRIP=${NDK_TOOLCHAIN_BASENAME}-strip
export ARCH_FLAGS="-march=armv7-a -mfloat-abi=softfp -mfpu=vfpv3-d16"
export ARCH_LINK="-march=armv7-a -Wl,--fix-cortex-a8"
export CPPFLAGS=" ${ARCH_FLAGS} -fpic -ffunction-sections -funwind-tables -fstack-protector -fno-strict-aliasing -finline-limit=64 "
export CXXFLAGS=" ${ARCH_FLAGS} -fpic -ffunction-sections -funwind-tables -fstack-protector -fno-strict-aliasing -finline-limit=64 -frtti -fexceptions "
export CFLAGS=" ${ARCH_FLAGS} -fpic -ffunction-sections -funwind-tables -fstack-protector -fno-strict-aliasing -finline-limit=64 "
export LDFLAGS=" ${ARCH_LINK} "
cd ${NGHTTP2_TMP_FOLDER}
echo $CC
./configure --host=arm-linux-androideabi  --disable-shared --enable-static
make

Build Output

If you run build scripts no error, it mean you have build success. Right now you can check the build output, in the source code root path. you will find the .libs folder. the folder context are as follows:

.libs
├── libnghttp2.a
├── libnghttp2.la -> ../libnghttp2.la
└── libnghttp2.lai