Package: gcc-4.9 Version: 4.9.2-10 -----
I have a LeMaker HiKey (http://www.96boards.org/products/ce/hikey-lemaker/). Its AARCH64 and Neon is mandatory feature (https://community.arm.com/groups/android-community/blog/2014/10/10/runtime-detection-of-cpu-features-on-an-armv8-a-cpu). GCC appears to be missing arm and neon instrinsics provided by arm_neon.h: $ find /usr/include -name 'arm_neon.h' $ In fact, grepping for the basic intrinsics like CRC32 returns no hits. For example, according to Section 9.2. of http://infocenter.arm.com/help/topic/com.arm.doc.ihi0053c/IHI0053C_acle_2_0.pdf, there should be a __crc32ch, __crc32cw and a __crc32cd available somewhere. ----- It looks like GCC took a bug report on it around the GCC 4.3 days circa 2009; see "arm_neon.h missing from ARM gcc in jaunty" (https://bugs.launchpad.net/ubuntu/+source/gcc-4.3/+bug/360819). A down stream/Linaro bug report is available at https://bugs.linaro.org/show_bug.cgi?id=2231. ----- $ gcc --version gcc (Debian/Linaro 4.9.2-10) 4.9.2 Copyright (C) 2014 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. ----- $ uname -a Linux hikey 3.18.0-linaro-hikey #1 SMP PREEMPT Mon Nov 30 00:11:03 UTC 2015 aarch64 GNU/Linux ----- $ apt-cache show gcc-4.9 Package: gcc-4.9 Version: 4.9.2-10 Installed-Size: 13703 Maintainer: Debian GCC Maintainers <debian-...@lists.debian.org> Architecture: arm64 Replaces: gccgo-4.9 (<< 4.9.2-10) Provides: c-compiler Depends: cpp-4.9 (= 4.9.2-10), gcc-4.9-base (= 4.9.2-10), binutils (>= 2.25), libgcc-4.9-dev (= 4.9.2-10), libc6 (>= 2.17), libcloog-isl4 (>= 0.17), libgmp10 (>= 2:5.0.1~), libisl10 (>= 0.10), libmpc3, libmpfr4 (>= 3.1.2), zlib1g (>= 1:1.1.4) Recommends: libc6-dev (>= 2.13-5) Suggests: gcc-4.9-doc (>= 4.9), gcc-4.9-locales (>= 4.9), libgcc1-dbg (>= 1:4.9.2-10), libgomp1-dbg (>= 4.9.2-10), libitm1-dbg (>= 4.9.2-10), libatomic1-dbg (>= 4.9.2-10), libasan1-dbg (>= 4.9.2-10), liblsan0-dbg (>= 4.9.2-10), libtsan0-dbg (>= 4.9.2-10), libubsan0-dbg (>= 4.9.2-10), libcilkrts5-dbg (>= 4.9.2-10), libquadmath-dbg (>= 4.9.2-10) Description-en: GNU C compiler This is the GNU C compiler, a fairly portable optimizing compiler for C. Description-md5: 394374e688b1afb3af5f419895d29698 Homepage: http://gcc.gnu.org/ Section: devel Priority: optional Filename: pool/main/g/gcc-4.9/gcc-4.9_4.9.2-10_arm64.deb Size: 4148946 MD5sum: d14d2ab1869bf1bf7e33b75b30953f22 SHA1: a1cd98d5af9b3259414cf01f9a4b8494c0a23b4a SHA256: f3c18034483a4e6289b233dcb97547c2ab73862c40b30d03da81cb226fdb8d79 ----- $ cat /proc/cpuinfo Processor : AArch64 Processor rev 3 (aarch64) processor : 0 processor : 1 processor : 2 processor : 3 processor : 4 processor : 5 processor : 6 processor : 7 Features : fp asimd evtstrm aes pmull sha1 sha2 crc32 CPU implementer : 0x41 CPU architecture: AArch64 CPU variant : 0x0 CPU part : 0xd03 CPU revision : 3 Hardware : HiKey Development Board