You signed in with another tab or window. NDK (Native Develop Toolkit) is a toolchain from Android official, originally for users who writes native C/C++ code as JNI library. You can build OpenBLAS (0.2.19 and earlier) with: This would be arm-linux-androideabi-gcc-4.9 for ARMV7 and aarch64-linux-android-gcc-4.9 for ARMV8. CMAKEANDROIDNDKTOOLCHAINVERSION¶ New in version 3.7. To use easily the prebuilt toolchains, follow building a standalone toolchain for your desired architecture. For instructions on how to build OpenBLAS with Fortran, see the next section. The prebuilt Android NDK toolchains do not include Fortran, hence parts like LAPACK cannot be built. Note: For NDK 23b, something as simple asĮxport NDK=YOUR_PATH_TO_SDK/Android/sdk/ndk/147Įxport TOOLCHAIN=$NDK/toolchains/llvm/prebuilt/darwin-x86_64ĬC="$TOOLCHAIN"/bin/armv7a-linux-androideabi21-clang \ĪR="$TOOLCHAIN"/bin/arm-linux-androideabi-ar \ĬC=$TOOLCHAIN/bin/aarch64-linux-android21-clang \ĪR=$TOOLCHAIN/bin/aarch64-linux-android-ar \ĬC="$TOOLCHAIN"/bin/i686-linux-android21-clang \ĪR="$TOOLCHAIN"/bin/i686-linux-android-ar \ĬC="$TOOLCHAIN"/bin/x86_64-linux-android21-clang \ĪR="$TOOLCHAIN"/bin/x86_64-linux-android-ar \Īlso you can find full list of target architectures in TargetsList.txtĪnything below this line should be irrelevant nowadays unless you need to perform software archeologyīuilding OpenBLAS with very old gcc-based versions of the NDK, without Fortran Implementations for CORTEXA57 target is compatible with all other armv8 targets. Note: Using TARGET=CORTEXA57 in place of ARMV8 will pick up better optimized routines. # Export PATH to contain directories of clang and aarch64-linux-android-* utilitiesĮxport PATH=$" HOSTCC=gcc -j4 Build ARMV7 with clangĮxport NDK_BUNDLE_DIR=/path/to/ndk-bundle/ If you want to use static linking with an old NDK version older than about r17, you need to choose an API level below 23 currently due to NDK bug 272 (, the libc.a lacks a definition of stderr) that will probably be fixed in r17 of the NDK. The same basic principles as described below for ARMV8 should also apply to building an x86 or x86_64 version (substitute something like NEHALEM for the target instead of ARMV8 and replace all the aarch64 in the toolchain paths obviously) "Historic" notes: Since version 19 the default toolchain is provided as a standalone toolchain, so building one yourself following building a standalone toolchain should no longer be necessary. See below sections on how to build with clang for ARMV7 and ARMV8 targets. clang is supported from OpenBLAS 0.2.20 version onwards. Building with android NDK using clang compilerĪround version 11 Android NDKs stopped supporting gcc, so you would need to use clang to compile OpenBLAS. In addition to the Android NDK, you will need both Perl and a C compiler on the build host as these are currently required by the OpenBLAS build environment.
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