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source: vbox/trunk/src/libs/openssl-1.1.1l/NOTES.ANDROID@ 95000

Last change on this file since 95000 was 91772, checked in by vboxsync, 3 years ago

openssl-1.1.1l: Applied and adjusted our OpenSSL changes to 1.1.1l. bugref:10126

File size: 4.4 KB
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1
2 NOTES FOR ANDROID PLATFORMS
3 ===========================
4
5 Requirement details
6 -------------------
7
8 Beside basic tools like perl and make you'll need to download the Android
9 NDK. It's available for Linux, macOS and Windows, but only Linux
10 version was actually tested. There is no reason to believe that macOS
11 wouldn't work. And as for Windows, it's unclear which "shell" would be
12 suitable, MSYS2 might have best chances. NDK version should play lesser
13 role, the goal is to support a range of most recent versions.
14
15 Configuration
16 -------------
17
18 Android is a naturally cross-compiled target and you can't use ./config.
19 You have to use ./Configure and name your target explicitly; there are
20 android-arm, android-arm64, android-mips, android-mip64, android-x86
21 and android-x86_64 (*MIPS targets are no longer supported with NDK R20+).
22 Do not pass --cross-compile-prefix (as you might be tempted), as it will
23 be "calculated" automatically based on chosen platform. Though you still
24 need to know the prefix to extend your PATH, in order to invoke
25 $(CROSS_COMPILE)clang [*gcc on NDK 19 and lower] and company. (Configure
26 will fail and give you a hint if you get it wrong.) Apart from PATH
27 adjustment you need to set ANDROID_NDK_HOME environment to point at the
28 NDK directory. If you're using a side-by-side NDK the path will look
29 something like /some/where/android-sdk/ndk/<ver>, and for a standalone
30 NDK the path will be something like /some/where/android-ndk-<ver>.
31 Both variables are significant at both configuration and compilation times.
32 The NDK customarily supports multiple Android API levels, e.g. android-14,
33 android-21, etc. By default latest API level is chosen. If you need to
34 target an older platform pass the argument -D__ANDROID_API__=N to Configure,
35 with N being the numerical value of the target platform version. For example,
36 to compile for Android 10 arm64 with a side-by-side NDK r20.0.5594570
37
38 export ANDROID_NDK_HOME=/home/whoever/Android/android-sdk/ndk/20.0.5594570
39 PATH=$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
40 ./Configure android-arm64 -D__ANDROID_API__=29
41 make
42
43 Older versions of the NDK have GCC under their common prebuilt tools directory, so the bin path
44 will be slightly different. EG: to compile for ICS on ARM with NDK 10d:
45
46 export ANDROID_NDK_HOME=/some/where/android-ndk-10d
47 PATH=$ANDROID_NDK_HOME/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin:$PATH
48 ./Configure android-arm -D__ANDROID_API__=14
49 make
50
51 Caveat lector! Earlier OpenSSL versions relied on additional CROSS_SYSROOT
52 variable set to $ANDROID_NDK_HOME/platforms/android-<api>/arch-<arch> to
53 appoint headers-n-libraries' location. It's still recognized in order
54 to facilitate migration from older projects. However, since API level
55 appears in CROSS_SYSROOT value, passing -D__ANDROID_API__=N can be in
56 conflict, and mixing the two is therefore not supported. Migration to
57 CROSS_SYSROOT-less setup is recommended.
58
59 One can engage clang by adjusting PATH to cover same NDK's clang. Just
60 keep in mind that if you miss it, Configure will try to use gcc...
61 Also, PATH would need even further adjustment to cover unprefixed, yet
62 target-specific, ar and ranlib. It's possible that you don't need to
63 bother, if binutils-multiarch is installed on your Linux system.
64
65 Another option is to create so called "standalone toolchain" tailored
66 for single specific platform including Android API level, and assign its
67 location to ANDROID_NDK_HOME. In such case you have to pass matching
68 target name to Configure and shouldn't use -D__ANDROID_API__=N. PATH
69 adjustment becomes simpler, $ANDROID_NDK_HOME/bin:$PATH suffices.
70
71 Running tests (on Linux)
72 ------------------------
73
74 This is not actually supported. Notes are meant rather as inspiration.
75
76 Even though build output targets alien system, it's possible to execute
77 test suite on Linux system by employing qemu-user. The trick is static
78 linking. Pass -static to Configure, then edit generated Makefile and
79 remove occurrences of -ldl and -pie flags. You would also need to pick
80 API version that comes with usable static libraries, 42/2=21 used to
81 work. Once built, you should be able to
82
83 env EXE_SHELL=qemu-<arch> make test
84
85 If you need to pass additional flag to qemu, quotes are your friend, e.g.
86
87 env EXE_SHELL="qemu-mips64el -cpu MIPS64R6-generic" make test
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