-march=native was not included in GCC 5.1 that Linaro provided. I don't know
if Linaro has plans to backport the support it but it is already there for GCC
6.
You don't need -mfpu=neon for AARCH64 at all. AARCH64 defaults to having simd
turned on.
Thanks,
Andrew Pinski
From: linaro-toolchain on behalf of
Virendra Kumar Pathak
Sent: Tuesday, June 9, 2015 10:26 PM
To: Linaro Toolchain Mailman List
Subject: mfpu=neon and -march=native on aarch64-linux-gnu toolchain
Hi Linaro Toolchain Group,
I have questions regarding -mfpu=neon and -march=native w.r.t aarch64 linaro
native toolchain (aarch64-linux-gnu)
I found gcc is not accepting these flags.
On juno Board:
gcc -mfpu=neon hello.c -o hello
gcc: error: unrecognized command line option '-mfpu=neon'
gcc -march=native hello.c -o hello
hello.c:1:0: error: unknown value 'native' for -march
Am I missing something ? Please help.
Below is the machine details
uname -a
Linux juno 3.10.55.0-1-linaro-lt-vexpress64 #1ubuntu1~ci+141022094025 SMP Wed
Oct 22 09:41:06 UTC 2014 aarch64 aarch64 aarch64 GNU/Linux
gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/local/apps/gcc-native/gcc-linaro-5.1-2015.06.06.native-i686-mingw32_aarch64-linux-gnu/bin/../libexec/gcc/aarch64-linux-gnu/5.1.1/lto-wrapper
Target: aarch64-linux-gnu
Configured with:
'/home/user_name/vpathak/build_abe/snapshots/gcc.git~linaro-4.9-branch/configure'
SHELL=/bin/sh --with-bugurl=https://bugs.linaro.org
--with-mpc=/home/user_name/vpathak/build_abe/builds/destdir/aarch64-linux-gnu
--with-mpfr=/home/user_name/vpathak/build_abe/builds/destdir/aarch64-linux-gnu
--with-gmp=/home/user_name/vpathak/build_abe/builds/destdir/aarch64-linux-gnu
--with-gnu-as --with-gnu-ld --disable-libstdcxx-pch --disable-libmudflap
--with-cloog=no --with-ppl=no --with-isl=no --disable-nls --enable-multiarch
--disable-multilib --enable-c99 --with-arch=armv8-a --disable-shared
--enable-static
--with-build-sysroot=/home/user_name/vpathak/build_abe/sysroots/aarch64-linux-gnu
--enable-lto --enable-linker-build-id --enable-long-long --enable-shared
--with-sysroot=/home/user_name/vpathak/build_abe/builds/destdir/aarch64-linux-gnu/aarch64-linux-gnu/libc
--enable-languages=c,c++,fortran,lto --enable-fix-cortex-a53-835769
--enable-checking=release --disable-bootstrap
--with-bugurl=https://bugs.linaro.org --build=x86_64-unknown-linux-gnu
--host=aarch64-linux-gnu --target=aarch64-linux-gnu
--prefix=/home/user_name/vpathak/build_abe/builds/destdir/aarch64-linux-gnu
Thread model: posix
gcc version 5.1.1 (GCC)
Thanks.
--
with regards,
Virendra Kumar Pathak
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