Examples of cross-compiling / embedded usage

[bitandquit]

Hi,

This is a great project!

I wanted to ask, can you provide some examples that show how to cross-compile for embedded use-cases? For example, would it just be setting the 'CC' environment variable? How would I specify something like a linker script, and the C-start-up code?

This is all commonly done for embedded environments (baremetals, without an OS, etc).

This is an example (not mine) of CMake for an ARM cortex-m0: https://github.com/infohoschie/arm-cortex-m0-cmake

[mrexodia]

You would call cmake with -DCMAKE_TOOLCHAIN_FILE=... as usual.

[mrexodia]

Perhaps to give a more concrete example of cross-compiling to Windows for ARM64 in case somebody runs across this:

• Clone the zig-cross project in your home directory:
  git clone https://github.com/mrexodia/zig-cross ~/zig-cross
• Configure your CMake (or cmkr, same thing) project with the following command line:
  cmake -G Ninja -B build-winarm64 -DCMAKE_TOOLCHAIN_FILE=~/zig-cross/cmake/zig-toolchain-winarm64.cmake
• Build the project:
  cmake --build build-winarm64

There are many other cross-compilation toolchains out there, they all work in the same way. The most important thing is that you do not hardcode toolchain/platform-specific flags in your project and everything will work smoothly.