If you intend to write a C program that is compiled on a certain host system but must execute on another target system, then you need to compile it with what's known as a cross compiler or cross toolchain. For example, in our use case, we want to work on an x86-64 host machine. It could even be an x86-64 guest VM, no issues, but run our code on an ARM-32 target:
- On Ubuntu, you can install the cross toolchain with the following:
sudo apt install crossbuild-essential-armhf
The preceding command installs an x86_64-to-ARM-32 toolchain appropriate for ARM-32 "hard float" (armhf) systems (such as the Raspberry Pi); this is usually just fine. It results in the arm-linux-gnueabihf-<foo> set of tools being installed; where <foo> represents cross tools such as addr2line, as, g++, gcc, gcov, gprof, ld, nm, objcopy, objdump, readelf, size, strip, and so on. (The cross compiler prefix in this case is arm-linux-gnueabihf-). In addition, though not mandatory, you can install the arm-linux-gnueabi-<foo> cross toolset like this:
sudo apt install gcc-arm-linux-gnueabi binutils-arm-linux-gnueabi
- On Fedora, you can install the cross toolchain with the following:
sudo dnf install arm-none-eabi-binutils-cs-<ver#> arm-none-eabi-gcc-cs-<ver#>
Installing and using a cross toolchain might require some reading up for newbie users. You can visit the Further reading section where I have placed a few useful links that will surely be of great help.
