c-backend: generating undeclared functions for zig.h

[bnuuydev]

Zig Version

0.15.0-dev.62+ea57fb55e

Steps to Reproduce and Observed Behavior

The C backend can be made to emit undeclared functions for the big type. This example shows this behaviour:

const std = @import("std");

pub fn main() void {
    std.debug.print("{}", .{@as(u256, 0)});
}

Functions such as zig_make_big and zig_lo_big are being emitted. These functions aren't, and as far as I can tell shouldn't be, defined in zig.h. Consequently, when this code is run using zig run test.zig -ofmt=c, it produces a load of errors, and doesn't run.

Expected Behavior

It looks like the issue is not that zig_make_big and zig_lo_big are undefined, it is that the c-backend is emitting these calls when it shouldn't be. The expected behaviour is obviously for this code to run without error.

[bnuuydev]

Sorry, this actually looks like a duplicate of #19991