Cross compilation by default

[Krakonos]

Hi!

I'm looking into replacing CMake with Meson for an embedded project that always cross-compiles using arm-none-eabi toolchain. As there is a lot of platform specific code, there is little chance of it working on another platform. I currently set toolchain file in CMake by default, so I don't have to specify it each time. I prefer the project builds with a simple meson setup builddir && meson compile -C builddir, not passing crossfile each time (and wondering why it fails if it's not passed). I'm looking through the documentation and could not find it. What's the suggested way to achieve it if it's even possible? I could always revert to a shell script to run meson, but that's not preventing devs from running meson directly not noticing the script.

Any advice is appreciated!

[eli-schwartz]

If nothing else, you can do

if not meson.is_cross_build()
    error('must be invoked with "meson setup--cross-file=./toolchain.ini" or via meson-wrapper.sh')
endif

This does make it impossible for devs to overlook the script.

I don't know off the top of my head if this is otherwise possible, unless maybe you can specify a cross file in default_options? Haven't tried it.

[xclaesse]

unless maybe you can specify a cross file in default_options

No, cross/native files are not options, just command line arguments. That should maybe be changed, but currently there is no other way than adding an error().