i686-unknown-cloudabi-cc: fatal error: 'stdio.h' file not found

[mcandre]

Hello, I am trying to figure out if I can build 32-bit binaries with the CloudABI toolchain on macOS. I can build and run 64-bit binaries with x86_64-unknown-cloudabi-cc, but when I use the i686 variant, I get an error about a missing header file, stdio.h. I get the same behavior in Docker as well.

Do I need to install some additional LLVM components, or pass some new flags to the compiler, to get this to work?

Same error for the aarch64 and armv6 eabihf compilers.

[EdSchouten]

Hi there,

To build i686 binaries, make sure to install i686-unknown-cloudabi-cxx-runtime. It's likely the case you only have the x86_64-* flavour installed. Do note that due to lack of decent support for position independent code on 32-bit x86, support for running these executables is more limited (e.g., cloudabi-run -e doesn't support them).

[mcandre]

@EdSchouten Thank you for explaining this! So i686 CloudABI binaries would require the runtime kernel to be patched? Does that mean i686 CloudABI binaries are unable to run on macOS?

[EdSchouten]

Exactly. i686 CloudABI binaries can't run on macOS. They can currently only be run on FreeBSD (both FreeBSD/i386 and FreeBSD/amd64).

FreeBSD's CloudABI support is integrated into the kernel, so we can give those processes a dedicated virtual address space.

Edit: Marking this as closed, as the original question as answered. Feel free to reopen if needed.