为 Raspberry Pi 选择交叉编译器

Question

Looking for cross compiler that could help me build application for Raspberry Pi on my Ubuntu 20.04 machine. I found official tools on Github and I suppose that folder arm-bcm2708 contains cross compilers:

arm-bcm2708hardfp-linux-gnueabi
arm-bcm2708-linux-gnueabi
arm-linux-gnueabihf -> arm-rpi-4.9.3-linux-gnueabihf
arm-rpi-4.9.3-linux-gnueabihf
gcc-linaro-arm-linux-gnueabihf-raspbian
gcc-linaro-arm-linux-gnueabihf-raspbian-x64

I'm confused what directories names is trying to tell me? I know following words:

arm - processor type used on Pi
bcm2708 - processor model used on pi
gnueabi - cross-compiler for armel architecture (you can build binary for ARM on PC)
linaro - company that creates multimedia for ARM
4.9.3 - I suppose is GCC compiler version (why it is so old?)

Which of compilers I should use for my Pi3 and Pi4?

Answer 1

You can use one of the toolchains provided by ARM for your RPI3/4. If you are running a 32 bit Linux on your RPI3/4, use one of the arm-none-linux-gnueabihf toolchains, if use are running a 64 bit Linux on your RPI3/4, use one of the aarch64-none-linux-gnu one.

Both 10.2 and 9.2 versions of the two toolchains are working fine on my own Ubuntu 20.04.1 LTS x86_64 system. Of course, you can cross-compile programs with the arm-none-linux-gnueabihf toolchain and run them on the 64 bit Linux running on your RPI3/4 as well.