Shell script to build boost for Android

build-boost-for-android.sh

#!/bin/bash

version=1.68.0
echo "Building boost $version..."

set -eu

toolchain=$PWD/toolchain
if [ ! -d "$toolchain" ]; then
  echo "Building toolchain..."
  $ANDROID_NDK_ROOT/build/tools/make-standalone-toolchain.sh \
      --arch=arm --platform=android-21 \
      --install-dir="$toolchain" \
      --toolchain=arm-linux-androideabi-clang \
      --use-llvm --stl=libc++
else
  echo "Toolchain already built"
fi

dir_name=boost_$(sed 's#\.#_#g' <<< $version)
archive=${dir_name}.tar.bz2
if [ ! -f "$archive" ]; then
  wget -O $archive "https://dl.bintray.com/boostorg/release/$version/source/$archive"
else
  echo "Archive $archive already downloaded"
fi

echo "Extracting..."
if [ ! -d "$dir_name" ]; then
  # rm -rf $dir_name
  tar xf $archive
else
  echo "Archive $archive already unpacked into $dir_name"
fi
cd $dir_name

echo "Generating config..."
user_config=tools/build/src/user-config.jam
rm -f $user_config
cat <<EOF > $user_config
import os ;

using clang : android
:
"$toolchain/bin/clang++"
:
<archiver>$toolchain/bin/arm-linux-androideabi-ar
<ranlib>$toolchain/bin/arm-linux-androideabi-ranlib
;
EOF

echo "Bootstrapping..."
./bootstrap.sh #--with-toolset=clang

echo "Building..."
./b2 -j32 \
    --with-atomic \
    --with-chrono \
    --with-container \
    --with-date_time \
    --with-exception \
    --with-fiber \
    --with-filesystem \
    --with-graph \
    --with-graph_parallel \
    --with-iostreams \
    --with-locale \
    --with-log \
    --with-math \
    --with-mpi \
    --with-program_options \
    --with-random \
    --with-regex \
    --with-serialization \
    --with-signals \
    --with-system \
    --with-test \
    --with-thread \
    --with-timer \
    --with-type_erasure \
    --with-wave \
    toolset=clang-android \
    architecture=arm \
    variant=release \
    --layout=versioned \
    target-os=android \
    threading=multi \
    threadapi=pthread \
    link=static \
    runtime-link=static \

echo "Running ranlib on libraries..."
libs=$(find "bin.v2/libs/" -name '*.a')
for lib in $libs; do
  "$toolchain/bin/arm-linux-androideabi-ranlib" "$lib"
done

echo "Done!"

Can you change this:
./b2 -j32
to
./b2 -j$NUM_CPU \

...and add this to top
#update the cpu count of your machine here
NUM_CPU=32

I lost few hours to understand why my linux box is freezing during build!

Or use b2 -j$(nproc) to autodetect the number of CPUs

Can you build with-context?

For anyone who might be interested in building boost for Android with c++17 support you can add the following
<cxxflags>-std=c++17
just above the line in the script
<archiver>$toolchain/bin/arm-linux-androideabi-ar

Thank you - works great for 1.68
I was trying to use this script to build 1.71 version - failed in

/home/v.sharayenko/boost_1_71_0/tools/build/src/tools/common.jam:983: in toolset-tag
*** argument error
* rule numbers.less ( n1 n2 )
* called with: ( 3 )
* missing argument n2

Component configuration:

    - atomic                   : building
    - chrono                   : building
    - container                : building
    - context                  : not building
    - contract                 : not building
    - coroutine                : not building
    - date_time                : building
    - exception                : building
    - fiber                    : building
    - filesystem               : building
    - graph                    : building
    - graph_parallel           : building
    - iostreams                : building
    - locale                   : building
    - log                      : building
    - math                     : building
    - mpi                      : building
    - program_options          : building
    - python                   : not building
    - random                   : building
    - regex                    : building
    - serialization            : building
    - signals                  : building
    - stacktrace               : not building
    - system                   : building
    - test                     : building
    - thread                   : building
    - timer                    : building
    - type_erasure             : building
    - wave                     : building

...patience...
...patience...
...patience...
...patience...
...patience...
...found 10925 targets...
...updating 362 targets...
clang-linux.compile.c++.without-pth bin.v2\libs\atomic\build\clang-linux-android\release\architecture-arm\link-static\target-os-android\threading-multi\lockpool.o
The system cannot find the path specified.

  "/c/Users/las3/Downloads/code/1/toolchain/bin/clang++" -c -x c++ -std=c++17 -O3 -Wall -Wno-inline  -DBOOST_ALL_NO_LIB=1 -DBOOST_ATOMIC_SOURCE -DBOOST_ATOMIC_STATIC_LINK=1 -DNDEBUG -I"." -o "bin.v2\libs\atomic\build\clang-linux-android\release\architecture-arm\link-static\target-os-android\threading-multi\lockpool.o" "libs\atomic\src\lockpool.cpp"

Anyone can help me please?

see
https://github.com/dec1/Boost-for-Android