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Code Issues Releases Wiki Activity

INSTALL.md: provide Android build instructions

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Closes #4606
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Andreas Falkenhahn 2019-11-16 22:05:43 +01:00 committed by Daniel Stenberg
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docs/INSTALL.md
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@ -284,6 +284,47 @@ will run on cats as old as OS X 10.6 ("Snow Leopard") (using bash):
./configure --with-darwinssl
make
# Android
When building curl for Android it's recommended to use a Linux environment
since using curl's `configure` script is the easiest way to build curl
for Android. Before you can build curl for Android, you need to install the
Android NDK first. This can be done using the SDK Manager that is part of
Android Studio. Once you have installed the Android NDK, you need to figure out
where it has been installed and then set up some environment variables before
launching `configure`. On macOS, those variables could look like this to compile
for `aarch64` and API level 29:
export NDK=~/Library/Android/sdk/ndk/20.1.5948944
export HOST_TAG=darwin-x86_64
export TOOLCHAIN=$NDK/toolchains/llvm/prebuilt/$HOST_TAG
export AR=$TOOLCHAIN/bin/aarch64-linux-android-ar
export AS=$TOOLCHAIN/bin/aarch64-linux-android-as
export CC=$TOOLCHAIN/bin/aarch64-linux-android29-clang
export CXX=$TOOLCHAIN/bin/aarch64-linux-android29-clang++
export LD=$TOOLCHAIN/bin/aarch64-linux-android-ld
export RANLIB=$TOOLCHAIN/bin/aarch64-linux-android-ranlib
export STRIP=$TOOLCHAIN/bin/aarch64-linux-android-strip
When building on Linux or targetting other API levels or architectures, you need
to adjust those variables accordingly. After that you can build curl like this:
./configure --host aarch64-linux-android --with-pic --disable-shared
Note that this won't give you SSL/TLS support. If you need SSL/TLS, you have
to build curl against a SSL/TLS layer, e.g. OpenSSL, because it's impossible for
curl to access Android's native SSL/TLS layer. To build curl for Android using
OpenSSL, follow the OpenSSL build instructions and then install `libssl.a` and
`libcrypto.a` to `$TOOLCHAIN/sysroot/usr/lib` and copy `include/openssl` to
`$TOOLCHAIN/sysroot/usr/include`. Now you can build curl for Android using
OpenSSL like this:
./configure --host aarch64-linux-android --with-pic --disable-shared --with-ssl="$TOOLCHAIN/sysroot/usr"
Note, however, that you must target at least Android M (API level 23) or `configure`
won't be able to detect OpenSSL since `stderr` (and the like) weren't defined
before Android M.
# Cross compile
Download and unpack the curl package.