Simple HOWTO building some linux apps and libraries from scratch on android

This howto is only draft! Sometimes i went upgrade this, or make page on my site and post link on it. Also we have a project for automated building, like buildroot and opkg repository for android.
All needed configs in attached file. If you have error on unpack - just rename my.zip in my.tar.bz2 and try to unpack. Please correct me, if needed.
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All work will be in home directory (/home/xvilka)
create dir build

mkdir build

1. Download the kernel (for android on your version for device) and unpack

make headers_install ARCH=arm INSTALL_HDR_PATH=~/build/kern_h/

For some optimisations you need know, which proccessor (SoC) in your android-system(gcc.gnu.org/onlinedocs/gcc-4.4.3/gcc/ARM-Options.html#ARM-Options)
Im have Motorola Milestone - SoC = TI OMAP3430 - ARM Cortex a8 (arch - armv7a)
(en.wikipedia.org/wiki/ARM_architecture)
So, if you have OMAP3430-processor - use the config files with -omap3430 suffix
If you have Quallcomm MSM7200A (HTC Hero) - use the config files with -msm7200a suffix

First, we need to define _XXFLAGS, which contain some optimisation options for your compiler:

export _XXCFLAGS=" -mcpu=cortex-a8 -march=armv7-a -mtune=cortex-a8 -mfpu=vfpv3 -O3 -Os" (if you have Motorola Milestone/Droid or other device with TI OMAP3430)
export _XXCFLAGS=" -march=armv6j -mtune=arm1136jf-s -O3 -Os" (if you have HTC Hero or other device with Quallcomm MSM 7200A)
............................................................................................
If you don't know which chip you have in phone use _XXCFLAGS=" -O3 -Os"

2. Download crosstool-ng (ymorin.is-a-geek.org/dokuwiki/projects/crosstool),
unpack, build (you must have make,install,bash,cut,sed,grep,gcc,awk,bison,flex,automake,libtool,stat,
wget,cvs,patch,tar,gzip,bzip2,lzma,readlink,ncurses)

.configure
make
make install

3. Create directory toolchain-android, and copy config to this
XVilka-crosstool-<suffix>.config in .config
XVilka-uClibc-<suffix>.config in uClibc-0.9.30.2.config (or later version, if available)
and then run:

ct-ng menuconfig

you may change some options, if needed!

(Also use options from XXCFLAGS:
Target options -> Target optimizations ->
Architecture-level equal -march, use armv7-a
Emit assembly for CPU equal -mcpu, use cortex-a8
Tune for cpu equal -mtune, use cortex-a8
Use specific FPU equal -mfpu, use vfpv3
Floating point use hardware, because it built-in TI OMAP3430
Target CFLAGS - use -O3 -Os
) - for the Motorola Milestone/Droid

(Also use options from _XXCFLAGS:
Target options -> Target optimizations ->
Architecture-level equal -march, use armv6j
Emit assembly for CPU equal -mcpu, use nothing
Tune for cpu equal -mtune, use arm1136jf-s
Floating point use software
Target CFLAGS - use -O3 -Os
) - for the HTC Hero

Save in .config

In file uClibs-0.9.30.2.config
edit this strings:
{
UCLIBC_HAS_FLOATS=y
UCLIBC_HAS_FPU=y
# UCLIBC_HAS_SOFT_FLOAT=y
UCLIBC_EXTRA_CFLAGS=" -march=armv7-a -mcpu=cortex-a8 -mtune=cortex-a8 -mfpu=vfpv3 -O3 -Os"
} - for the Motorola Milestone/Droid

{
UCLIBC_HAS_FLOATS=y
#UCLIBC_HAS_FPU=y
UCLIBC_HAS_SOFT_FLOAT=y
UCLIBC_EXTRA_CFLAGS=" -march=armv6j -mtune=arm1136jf-s -O3 -Os"
} - for the HTC Hero

and then run

ct-ng build

4. Ok, done. We have installed cross - toolchain in directory build/x-tools.
And all programs in it with names arm-android-linux-uclibsgnueabi-*
For easy using add this directory in PATH:

PATH=~/build/x-tools/arm-android-linux-uclibcgnueabi/bin:$PATH

so we can run cross-gcc by the command:
arm-android-linux-uclibcgnueabi-gcc
Root directory of target system is:
~/build/x-tools/arm-android-linux-uclibcgnueabi/arm-android-linux-uclibcgnueabi/sys-root
But for the safe - make new root dir and copy files too.
Copy files in ~/build/cross/sys-root
chmod +w sys-root
chmod +w sys-root/usr

5. Building busybox (only static build, but if we have static busybox in any problems with system problems with libs
we can easy use busybox as repair-mode tool)
copy file XVilka-busybox-<suffix>.config in .config

make menuconfig
make ARCH=arm CC="arm-android-linux-uclibcgnueabi-gcc" CROSS_COMPILE="arm-android-linux-uclibcgnueabi-" \
CFLAGS=" -static $_XXFLAGS"
make install CONFIG_PREFIX=~/build/cross/sys-root

Copy ~/build/cross/sys-root/bin/busybox in /system/bin on device

chown root /system/bin/busybox
chmod 755 /system/bin/busybox
ln -s /system/bin/busybox /system/bin/ash

Or in other directory and you can install all programs included in busybox by the command:
busybox --install

7. Building simple but powerful text editor jupp (mirbsd.org/jupp.htm)

chmod +x configure
./configure --prefix=/system/local --disable-curses --disable-termcap --disable-termidx --host=arm-android-linux-uclibcgnueabi ARCH=arm \
CC="arm-android-linux-uclibcgnueabi-gcc" CROSS_COMPILE="arm-android-linux-uclibcgnueabi-" sysconfdir=/system/usr/local/etc sysconfjoesubdir=/joe \
CFLAGS=" -static $_XXFLAGS"
make
arm-android-linux-uclibcgnueabi-strip joe

On device:
copy joe in /system/bin
copy joerc in /system/usr/local/etc/joe
copy jupprc in /system/usr/local/etc/joe
copy jmacsrc in /system/usr/local/etc/joe
copy sintax files in /system/usr/local/etc/joe/syntax
chmod 755 /system/bin/joe
ln -s /system/bin/joe /system/bin/jupp
ln -s /system/bin/joe /system/bin/jmacs
chmod 644 /system/usr/local/etc/joe/joerc
chmod 644 /system/usr/local/etc/joe/jupprc
chmod 644 /system/usr/local/etc/joe/jmacsrc

before running joe we must define TERM

export TERM=ansi

8. How to use dinamic linking and shared libraries
(if we installed programs in local directory in sys-root,
so copy lib from local)

cd ~/build/cross/sys-root
tar -jcf lib.tar.bz2 lib/

And on device:

cd /system/usr/local
busybox tar -xcf /sdcard/lib.tar.bz2

For our programs, wich uses this non-standart library path we may create this script and run your programs by it:

#!/bin/sh
export LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH
exec /usr/bin/local/some_program $*

9. Building libFLAC in shared library, which we can use easy and copy to /system/lib,
which have nothing in NEEDED - just kernel and you, also no any libc (bionic, or uClibc) not used.

Download latest version of libFLAC from the official site, unpack and cd to dir:

./autogen.sh --host=arm --target=arm-android-linux-uclibcgnueabi CC="arm-android-linux-uclibcgnueabi-gcc" \
CXX="arm-android-linux-uclibcgnueabi-g++" STRIP="arm-android-linux-uclibcgnueabi-strip" \
AR="arm-android-linux-uclibcgnueabi-ar" AS="arm-android-linux-uclibcgnueabi-as" LD="arm-android-linux-uclibcgnueabi-ld" \
RANLIB="arm-android-linux-uclibcgnueabi-ranlib" OBJDUMP="arm-android-linux-uclibcgnueabi-objdump" \
NM="arm-android-linux-uclibcgnueabi-nm" CROSS_COMPILE="arm-android-linux-uclibcgnueabi-" \
CFLAGS=" -nodefaultlibs -nostdlib -fPIC $_XXFLAGS" \
CXXFLAGS=" -nodefaultlibs -nostdlib -fPIC $_XXFLAGS" \
LDFLAGS=" -fPIC -static -s -L$HOME/build/cross/sys-root/usr/lib -lm -lc" --prefix="$HOME/build/cross/sys-root/usr" \
--disable-ogg --disable-oggtest --disable-rpath --disable-xmms-plugin --disable-cpplibs --disable-altivec \
--disable-3dnow --disable-thorough-tests --disable-doxygen-docs

cd src/libFLAC
make
cd .libs
arm-android-linux-uclibcgnueabi-ld -shared -s -o libFLAC.so -whole-archive libFLAC.a

And now we have shared library libFLAC.so, lybrary without any dependency, and which we can just copy in /system/lib
on device and use it from any program.

For programming on libFLAC you must see header files of libFLAC

10. Building xvid in shared library, without any dependecy, same as libFLAC.

cd src/build/generic
./configure --host=arm --target=arm-android-linux-uclibcgnueabi CC="arm-android-linux-uclibcgnueabi-gcc" \
CXX="arm-android-linux-uclibcgnueabi-g++" STRIP="arm-android-linux-uclibcgnueabi-strip" \
AR="arm-android-linux-uclibcgnueabi-ar" AS="arm-android-linux-uclibcgnueabi-as" \
LD="arm-android-linux-uclibcgnueabi-ld" RANLIB="arm-android-linux-uclibcgnueabi-ranlib" \
OBJDUMP="arm-android-linux-uclibcgnueabi-objdump" NM="arm-android-linux-uclibcgnueabi-nm" \
CROSS_COMPILE="arm-android-linux-uclibcgnueabi-" \
CFLAGS=" -nodefaultlibs -nostdlib -fPIC $_XXFLAGS" \
CXXFLAGS=" -nodefaultlibs -nostdlib -fPIC $_XXFLAGS" \
LDFLAGS=" -fPIC -static -s -L$HOME/build/cross/sys-root/usr/lib -lm -lc" --prefix="$HOME/build/cross/sys-root/usr"
cd =build
rm-android-linux-uclibcgnueabi-ld -shared -s -o libxvidcore.so -whole-archive libxvidcore.a

So we have libxvidcore.so, which using very-very simple and copy-only-use too.


11. Building nmap

svn co --username guest --password "" svn://svn.insecure.org/nmap/
cd nmap
./configure --host=arm-android-linux-uclibcgnueabi CC="arm-android-linux-uclibcgnueabi-gcc" \
CROSS_COMPILE="arm-android-linux-uclibcgnueabi-" CFLAGS=" -static $_XXFLAGS" \
CXXFLAGS=" -static $_XXFLAGS" \
--prefix="$HOME/build/cross/sys-root/system/usr/local" --with-lua=included --with-pcap=included --with-pcre=included --with-dnet=included
make
make install


12. Building dropbear

./configure --host=arm-android-linux-uclibcgnueabi CC="arm-android-linux-uclibcgnueabi-gcc" \
CROSS_COMPILE="arm-android-linux-uclibcgnueabi-" \
CFLAGS=" -static $_XXFLAGS" \
--prefix="$HOME/build/cross/sys-root/system/usr/local" --disable-zlib
make
make install

copy dbclient, dropbearconvert and dropbearkey in /system/bin
copy dropbear in /system/sbin

chown root on all copied files
chmod 755 on all copied files

Here is russian version of manual http://wiki.androidfan.ru/Сборка_c_нуля

Also there some updates too: https://www.droid-developers.org/wiki/Toolchain