mirror of
https://github.com/openssl/openssl.git
synced 2024-11-21 01:15:20 +08:00
99ffd5ade5
According to forum discussions with NDK developers, ANDROID_NDK_HOME is used for something else. Fixes #11205 Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/11206)
88 lines
4.4 KiB
Plaintext
88 lines
4.4 KiB
Plaintext
|
|
NOTES FOR ANDROID PLATFORMS
|
|
===========================
|
|
|
|
Requirement details
|
|
-------------------
|
|
|
|
Beside basic tools like perl and make you'll need to download the Android
|
|
NDK. It's available for Linux, Mac OS X and Windows, but only Linux
|
|
version was actually tested. There is no reason to believe that Mac OS X
|
|
wouldn't work. And as for Windows, it's unclear which "shell" would be
|
|
suitable, MSYS2 might have best chances. NDK version should play lesser
|
|
role, the goal is to support a range of most recent versions.
|
|
|
|
Configuration
|
|
-------------
|
|
|
|
Android is a naturally cross-compiled target and you can't use ./config.
|
|
You have to use ./Configure and name your target explicitly; there are
|
|
android-arm, android-arm64, android-mips, android-mip64, android-x86
|
|
and android-x86_64 (*MIPS targets are no longer supported with NDK R20+).
|
|
Do not pass --cross-compile-prefix (as you might be tempted), as it will
|
|
be "calculated" automatically based on chosen platform. Though you still
|
|
need to know the prefix to extend your PATH, in order to invoke
|
|
$(CROSS_COMPILE)clang [*gcc on NDK 19 and lower] and company. (Configure
|
|
will fail and give you a hint if you get it wrong.) Apart from PATH
|
|
adjustment you need to set ANDROID_NDK_ROOT environment to point at the
|
|
NDK directory. If you're using a side-by-side NDK the path will look
|
|
something like /some/where/android-sdk/ndk/<ver>, and for a standalone
|
|
NDK the path will be something like /some/where/android-ndk-<ver>.
|
|
Both variables are significant at both configuration and compilation times.
|
|
The NDK customarily supports multiple Android API levels, e.g. android-14,
|
|
android-21, etc. By default latest API level is chosen. If you need to
|
|
target an older platform pass the argument -D__ANDROID_API__=N to Configure,
|
|
with N being the numerical value of the target platform version. For example,
|
|
to compile for Android 10 arm64 with a side-by-side NDK r20.0.5594570
|
|
|
|
export ANDROID_NDK_ROOT=/home/whoever/Android/android-sdk/ndk/20.0.5594570
|
|
PATH=$ANDROID_NDK_ROOT/toolchains/llvm/prebuilt/linux-x86_64/bin:$ANDROID_NDK_ROOT/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin:$PATH
|
|
./Configure android-arm64 -D__ANDROID_API__=29
|
|
make
|
|
|
|
Older versions of the NDK have GCC under their common prebuilt tools directory, so the bin path
|
|
will be slightly different. EG: to compile for ICS on ARM with NDK 10d:
|
|
|
|
export ANDROID_NDK_ROOT=/some/where/android-ndk-10d
|
|
PATH=$ANDROID_NDK_ROOT/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin:$PATH
|
|
./Configure android-arm -D__ANDROID_API__=14
|
|
make
|
|
|
|
Caveat lector! Earlier OpenSSL versions relied on additional CROSS_SYSROOT
|
|
variable set to $ANDROID_NDK_ROOT/platforms/android-<api>/arch-<arch> to
|
|
appoint headers-n-libraries' location. It's still recognized in order
|
|
to facilitate migration from older projects. However, since API level
|
|
appears in CROSS_SYSROOT value, passing -D__ANDROID_API__=N can be in
|
|
conflict, and mixing the two is therefore not supported. Migration to
|
|
CROSS_SYSROOT-less setup is recommended.
|
|
|
|
One can engage clang by adjusting PATH to cover same NDK's clang. Just
|
|
keep in mind that if you miss it, Configure will try to use gcc...
|
|
Also, PATH would need even further adjustment to cover unprefixed, yet
|
|
target-specific, ar and ranlib. It's possible that you don't need to
|
|
bother, if binutils-multiarch is installed on your Linux system.
|
|
|
|
Another option is to create so called "standalone toolchain" tailored
|
|
for single specific platform including Android API level, and assign its
|
|
location to ANDROID_NDK_ROOT. In such case you have to pass matching
|
|
target name to Configure and shouldn't use -D__ANDROID_API__=N. PATH
|
|
adjustment becomes simpler, $ANDROID_NDK_ROOT/bin:$PATH suffices.
|
|
|
|
Running tests (on Linux)
|
|
------------------------
|
|
|
|
This is not actually supported. Notes are meant rather as inspiration.
|
|
|
|
Even though build output targets alien system, it's possible to execute
|
|
test suite on Linux system by employing qemu-user. The trick is static
|
|
linking. Pass -static to Configure, then edit generated Makefile and
|
|
remove occurrences of -ldl and -pie flags. You would also need to pick
|
|
API version that comes with usable static libraries, 42/2=21 used to
|
|
work. Once built, you should be able to
|
|
|
|
env EXE_SHELL=qemu-<arch> make test
|
|
|
|
If you need to pass additional flag to qemu, quotes are your friend, e.g.
|
|
|
|
env EXE_SHELL="qemu-mips64el -cpu MIPS64R6-generic" make test
|