IDO Build Configuration

Splat detects the compiler and sets options.compiler: IDO in the yaml. This skill covers how to configure the build for IDO.

asm-processor

IDO doesn't support inline assembly the way modern compilers do. asm-processor solves this by:

1. Replacing GLOBAL_ASM blocks with dummy C code of matching sizes
2. Compiling everything together with IDO
3. Overwriting the dummy output with actual assembly

This lets assembly and C coexist without recompilation complexity. It also handles tricky cases like "late_rodata" (read-only data emitted in two passes by IDO).

See https://github.com/simonlindholm/asm-processor for details.

Download

Download prebuilt binaries from https://github.com/simonlindholm/asm-processor/releases

URL pattern:

https://github.com/simonlindholm/asm-processor/releases/download/1.0.1/asm-processor-{triple}.tar.xz

Triples: aarch64-apple-darwin, x86_64-apple-darwin, x86_64-pc-windows-msvc (.zip), aarch64-unknown-linux-gnu, x86_64-unknown-linux-gnu

Build Integration

asm-processor wraps the IDO compiler. See https://github.com/ethteck/pokemonsnap/blob/main/configure.py for a full example.

The command pattern:

tools/asm_proc/asm-processor {IDO_CC} -- {CROSS_AS} {AS_FLAGS} -- {IDO_FLAGS} -c -o $out $in

Where:

• First -- separates IDO path from assembler
• Second -- separates assembler from IDO flags