2018-03-16 11:14:28 +00:00
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NOTES FOR ANDROID PLATFORMS
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===========================
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Requirement details
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-------------------
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Beside basic tools like perl and make you'll need to download the Android
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NDK. It's available for Linux, Mac OS X and Windows, but only Linux
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version was actually tested. There is no reason to believe that Mac OS X
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wouldn't work. And as for Windows, it's unclear which "shell" would be
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suitable, MSYS2 might have best chances. NDK version should play lesser
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role, the goal is to support a range of most recent versions.
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Configuration
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-------------
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Android is naturally cross-compiled target and you can't use ./config.
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You have to use ./Configure and name your target explicitly; there are
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android-arm, android-arm64, android-mips, android-mip64, android-x86
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and android-x86_64. Do not pass --cross-compile-prefix (as you might
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be tempted), as it will be "calculated" automatically based on chosen
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platform. Though you still need to know the prefix to extend your PATH,
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in order to invoke $(CROSS_COMPILE)gcc and company. (Configure will fail
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and give you a hint if you get it wrong.) Apart from PATH adjustment
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you need to set ANDROID_NDK environment to point at NDK directory
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as /some/where/android-ndk-<ver>. NDK customarily supports multiple
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Android API levels, e.g. android-14, android-21, etc. By default latest
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one available is chosen. If you need to target older platform, pass
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additional -D__ANDROID_API__=N to Configure. N is numeric value of the
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target platform version. For example, to compile for ICS on ARM with
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NDK 10d:
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ANDROID_NDK=/some/where/android-ndk-10d
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PATH=$ANDROID_NDK/toolchains/arm-linux-androideabi-4.8/prebuild/linux-x86_64/bin:$PATH
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./Configure android-arm -D__ANDROID_API__=14
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Caveat lector! Earlier OpenSSL versions relied on additional CROSS_SYSROOT
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variable set to $ANDROID_NDK/platforms/android-<api>/arch-<arch> to
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appoint headers-n-libraries' location. It's still recognized in order
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to facilitate migration from older projects. However, since API level
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appears in CROSS_SYSROOT value, passing -D__ANDROID_API__=N can be in
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conflict, and mixing the two is therefore not supported. Migration to
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CROSS_SYSROOT-less setup is recommended.
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2018-03-17 09:59:57 +00:00
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One can engage clang by adjusting PATH to cover NDK's clang. Just keep
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in mind that if you miss it, Configure will try to use gcc... Also,
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PATH would need even further adjustment to cover unprefixed, yet
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target-specific, ar and ranlib (or not, if you use binutils-multiarch
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on your Linux).
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2018-03-16 11:14:28 +00:00
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Running tests (on Linux)
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------------------------
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This is not actually supported. Notes are meant rather as inspiration.
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Even though build output targets alien system, it's possible to execute
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test suite on Linux system by employing qemu-user. The trick is static
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linking. Pass -static to Configure, then edit generated Makefile and
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remove occurrences of -ldl and -pie flags. You would also need to pick
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API version that comes with usable static libraries, 42/2=21 used to
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work. Once built, you should be able to
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env EXE_SHELL=qemu-<arch> make test
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If you need to pass additional flag to qemu, quotes are your friend, e.g.
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env EXE_SHELL="qemu-mips64el -cpu MIPS64R6-generic" make test
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