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Some corrections and improvements from testing on my side #2

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bcded04
Build for arm target on x86_64 Linux work only with zlib included
dmikushin Jan 28, 2020
a6dab51
Do not remove existing Git clones of Google repos, if they are valid …
dmikushin Jan 28, 2020
1c0a0b9
Print some initial build info
dmikushin Jan 28, 2020
46d7bc9
Formatting README.md and adding some instructions
dmikushin Jan 28, 2020
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26 changes: 18 additions & 8 deletions README.md
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Original file line number Diff line number Diff line change
@@ -1,13 +1,23 @@
# libc-bionic
This repository contains scripts to build bionic libc (used in Android) only.
# Android Bionic Libc Standalone build

I was unable to find any documentation to build just bionic, which gave rise to this.
This repository contains scripts to build standalone **Bionic Libc** - the C Runtime Library used in Android. I was unable to find any documentation to build bionic alone, which gave rise to this.

## Prerequisites

Please install `python2`, `libc-dev-i386` and `g++-multilib` first.

Building under Linux subsystem for Windows is not supported, yet. The subsystem cannot
run 32-bit executables generated while building.
## Build

Execute the script, specifying the target configuration:

```
arch=arm ./build.sh
```

The resulting libraries with be placed into `./android_build/out/target/product/generic/obj/lib`.

## Status

Building under Linux subsystem for Windows (WSL) is not supported, yet. The subsystem cannot run 32-bit executables generated while building.

Only the latest nougat-release branch is supported as of now. I'm open to pull requests
adding support for older ones. As a consequence, the build system will use ninja, which
is mandatory post Marshmallow releases.
Only the latest Nougat release branch is supported as of now. I'm open to pull requests adding support for older ones. As a consequence, the build system will use `ninja`, which is mandatory post Marshmallow releases.
24 changes: 14 additions & 10 deletions build.sh
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Expand Up @@ -14,14 +14,19 @@ sources=('bionic' 'libnativehelper' 'build' 'build/kati' 'system/core' 'system/e
: ${skipndk:='no'}
# benchmarks are broken right now
: ${skipbenches:='yes'}
# zlib is not required for building
: ${skipzlib:='yes'}
: ${skipzlib:='no'}
ndkarch=$arch
gccarch=$arch
luncharch=$arch
gccver=4.9

echo "==========="
echo "libc-bionic"
echo "==========="
echo

abi="$arch-linux-android"
echo "Target ABI: $abi"

case $arch in
x86) abi='x86_64-linux-android'; ndkarch='x86_64';;
Expand All @@ -35,17 +40,16 @@ prebuilts=( "prebuilts/gcc/linux-x86/$gccarch/$abi-$gccver" "prebuilts/gcc/linux
'prebuilts/clang/host/linux-x86' 'prebuilts/gcc/linux-x86/host/x86_64-w64-mingw32-4.8' 'prebuilts/ninja/linux-x86' 'prebuilts/misc')

download_from_git () {
echo "downloading $1"
echo "Cloning $1"

if [ -d "$topdir/$1" ]
then
rm -rf "$topdir/$1"
if [ ! -d "$topdir/$1" ]; then
mkdir -p "$topdir/$1"
cd "$topdir/$1"
git init -q
git remote add origin "$googlebaseurl/$1"
fi
mkdir -p "$topdir/$1"
cd "$topdir/$1"

git init -q
git remote add origin "$googlebaseurl/$1"
cd "$topdir/$1"
git fetch --depth 1 origin "$2" -q
git reset --hard FETCH_HEAD -q

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