[ubuntu @tmp]$ export PATH=$PATH:/usr/local/oecore-x86_64/sysroots/x86_64-oesdk-linux/usr/bin/aarch64-poky-linux   //导出编译工具链的路径

[ubuntu @tmp]$ export CC="aarch64-poky-linux-gcc -march=armv8-a -mtune=cortex-a57.cortex-a53 --sysroot=/usr/local/oecore-x86_64/sysroots/aarch64-poky-linux" //编译时要指定sysroot

[ubuntu @tmp]$ $CC test.c -o test //编译

[ubuntu @Yocto]$ . scripts/oesdk_app.sh

[ubuntu @Yocto]$ $CC -v

Using built-in specs.

COLLECT_GCC=aarch64-poky-linux-gcc

COLLECT_LTO_WRAPPER=/usr/local/oecore-x86_64/sysroots/x86_64-oesdk-linux/usr/libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/7.2./lto-wrapper

Target: aarch64-poky-linux

Configured with: ../../../../../../work-shared/gcc-7.2.-r0/gcc-7.2./configure

--build=x86_64-linux

--host=x86_64-oesdk-linux

--target=aarch64-poky-linux

--prefix=/usr/local/oecore-x86_64/sysroots/x86_64-oesdk-linux/usr

--exec_prefix=/usr/local/oecore-x86_64/sysroots/x86_64-oesdk-linux/usr

--bindir=/usr/local/oecore-x86_64/sysroots/x86_64-oesdk-linux/usr/bin/aarch64-poky-linux

--sbindir=/usr/local/oecore-x86_64/sysroots/x86_64-oesdk-linux/usr/bin/aarch64-poky-linux

--libexecdir=/usr/local/oecore-x86_64/sysroots/x86_64-oesdk-linux/usr/libexec/aarch64-poky-linux

--datadir=/usr/local/oecore-x86_64/sysroots/x86_64-oesdk-linux/usr/share

--sysconfdir=/usr/local/oecore-x86_64/sysroots/x86_64-oesdk-linux/etc

--sharedstatedir=/usr/local/oecore-x86_64/sysroots/x86_64-oesdk-linux/com

--localstatedir=/usr/local/oecore-x86_64/sysroots/x86_64-oesdk-linux/var

--libdir=/usr/local/oecore-x86_64/sysroots/x86_64-oesdk-linux/usr/lib/aarch64-poky-linux

--includedir=/usr/local/oecore-x86_64/sysroots/x86_64-oesdk-linux/usr/include

--oldincludedir=/usr/local/oecore-x86_64/sysroots/x86_64-oesdk-linux/usr/include

--infodir=/usr/local/oecore-x86_64/sysroots/x86_64-oesdk-linux/usr/share/info

--mandir=/usr/local/oecore-x86_64/sysroots/x86_64-oesdk-linux/usr/share/man

--disable-silent-rules

--disable-dependency-tracking

--with-libtool-sysroot=/home/user10/g6s/build/tmp/work/x86_64-nativesdk-oesdk-linux/gcc-cross-canadian-aarch64/7.2.-r0/recipe-sysroot

--with-gnu-ld

--enable-shared

--enable-languages=c,c++

--enable-threads=posix

--enable-multilib

--enable-c99

--enable-long-long

--enable-symvers=gnu

--enable-libstdcxx-pch

--program-prefix=aarch64-poky-linux-

--without-local-prefix

--enable-lto

--enable-libssp

--enable-libitm

--disable-bootstrap

--disable-libmudflap

--with-system-zlib

--with-linker-hash-style=gnu

--enable-linker-build-id

--with-ppl=no

--with-cloog=no

--enable-checking=release

--enable-cheaders=c_global

--without-isl

--with-gxx-include-dir=/not/exist/usr/include/c++/7.2.

--with-build-time-tools=/home/user10/g6s/build/tmp/work/x86_64-nativesdk-oesdk-linux/gcc-cross-canadian-aarch64/7.2.-r0/recipe-sysroot-native/usr/aarch64-poky-linux/bin

--with-sysroot=/not/exist

--with-build-sysroot=/home/user10/g6s/build/tmp/work/x86_64-nativesdk-oesdk-linux/gcc-cross-canadian-aarch64/7.2.-r0/recipe-sysroot

--without-long-double-

--enable-poison-system-directories

--with-mpfr=/home/user1/g6p/build/tmp/work/x86_64-nativesdk-oesdk-linux/gcc-cross-canadian-aarch64/7.2.-r0/recipe-sysroot

--with-mpc=/home/user1/g6p/build/tmp/work/x86_64-nativesdk-oesdk-linux/gcc-cross-canadian-aarch64/7.2.-r0/recipe-sysroot

--enable-nls

--enable-initfini-array

--enable-__cxa_atexit

Thread model: posix

gcc version 7.2. (GCC)