Cross compile C program for rk3568 development board

The supporting data is on the network disk “iTOP-3568 Development board \02_iTOP-3568 Summary of development data （ No CD data ）\10_Linux  Supporting materials for system development \ Cross compilation C Program supporting data ”
21.1 Set up cross compilation tool
Cross compiling tool in network disk data “iTOP-3568 Development board \02_iTOP-3568 Summary of development data （ No CD data ）\10_Linux Supporting materials for system development \ Cross compilation C Program supporting data \ Cross compiler ” Under the table of contents , We copy the compressed package to  Ubuntu  Of /usr/local/arm64 Under the table of contents ( without arm64 Folder , Need to create a new one arm64 Folder ), Then decompress , As shown in the figure below ：

Method 1 ： Set temporary environment variables
The so-called temporary environment variable , It refers to setting the environment variable of cross compilation in a window , If you change another terminal window, it will fail .
We set the temporary environment variables as shown in the figure below ：
export PATH=/usr/local/arm64/gcc-linaro-6.3.1-2017.05-x86_64_aarch64-linux-gnu/binPATH
Input “echo $PATH”, Check whether the environment variable is added , Add the environment variable, as shown by the arrow in the figure below ：

Be careful ！！！ Cross compilation C The program must compile in the window where the environment variable has just been set .
hello.c Data on CD “iTOP-3568 Development board \02_iTOP-3568 Summary of development data （ No CD data ）\10_Linux System on
Send supporting materials \ Cross compilation C Program supporting data \C Program ” Under the table of contents .
Enter the following command to compile ：
aarch64-linux-gnu-gcc hello.c -o hello
chmod 777 hello

Method 2 ： Environment variables are not set , Compile directly using absolute path .
The crossover we're going to use Ed translate device aarch64-linux-gnu-gcc , stay virtual quasi machine ubuntu Of
/usr/local/arm64/gcc-linaro-6.3.1-2017.05-x86_64_aarch64-linux-gnu/bin Under this path , So we can use
Absolute path find this compiler to compile , go back to hello.c Path , Cross compile with commands hello.c
/usr/local/arm64/gcc-linaro-6.3.1-2017.05-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-gcc hello.c -o
hello

2 function C Program
We will compile the last step hello Copy the executable program to the development board , The development board can burn Linux System ,Debian System ,Ubuntu System , We use buildroot System as an example .
First of all, will hello The executable program is copied to U On the disk , And then U Insert the disk into the of the development board usb mouth , grant hello 777 jurisdiction , And then run the program , As shown in the figure below ：

You can refer to compiling hello To compile other C Program .