+++ /dev/null
-
- 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
- $(CROSS_COMPILE)clang [*gcc on NDK 19 and lower] and company. (Configure
- will fail and give you a hint if you get it wrong.) Apart from PATH
- adjustment you need to set ANDROID_NDK_HOME environment to point at the
- NDK directory. If you're using a side-by-side NDK the path will look
- something like /some/where/android-sdk/ndk/<ver>, and for a standalone
- NDK the path will be something like /some/where/android-ndk-<ver>.
- Both variables are significant at both configuration and compilation times.
- The NDK customarily supports multiple Android API levels, e.g. android-14,
- android-21, etc. By default latest API level is chosen. If you need to
- target an older platform pass the argument -D__ANDROID_API__=N to Configure,
- with N being the numerical value of the target platform version. For example,
- to compile for Android 10 arm64 with a side-by-side NDK r20.0.5594570
-
- export ANDROID_NDK_HOME=/home/whoever/Android/android-sdk/ndk/20.0.5594570
- PATH=$ANDROID_NDK_HOME/toolchains/llvm/prebuilt/linux-x86_64/bin:$ANDROID_NDK_HOME/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin:$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_HOME=/some/where/android-ndk-10d
- PATH=$ANDROID_NDK_HOME/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin:$PATH
- ./Configure android-arm -D__ANDROID_API__=14
- make
-
- Caveat lector! Earlier OpenSSL versions relied on additional CROSS_SYSROOT
- variable set to $ANDROID_NDK_HOME/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_HOME. In such case you have to pass matching
- target name to Configure and shouldn't use -D__ANDROID_API__=N. PATH
- adjustment becomes simpler, $ANDROID_NDK_HOME/bin:$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
projects / openssl.git / blobdiff