demo @compilelog

output

[nix-shell:~/dev/zig/build]$ ./zig build_obj test2.zig 
| "sin_result", 0.909297
| "fabs_result", 0.909297
| "fabs_bits", 1063831479
| "scaled_up", 3905402623.090703
| "anded", 3905402623
/home/andy/dev/zig/build/test2.zig:11:5: error: found compile log statement
    @compileLog("sin_result", sin_result);
    ^
/home/andy/dev/zig/build/test2.zig:12:5: error: found compile log statement
    @compileLog("fabs_result", fabs_result);
    ^
/home/andy/dev/zig/build/test2.zig:13:5: error: found compile log statement
    @compileLog("fabs_bits", fabs_bits);
    ^
/home/andy/dev/zig/build/test2.zig:14:5: error: found compile log statement
    @compileLog("scaled_up", scaled_up);
    ^
/home/andy/dev/zig/build/test2.zig:15:5: error: found compile log statement
    @compileLog("anded", anded);
    ^

[nix-shell:~/dev/zig/build]$ 

test.zig

const math = @import("std").math;

comptime {
    var i: u32 = 1;
    const sin_result = math.sin(f32(i+1));
    const fabs_result = math.fabs( sin_result );
    const fabs_bits = @bitCast(u32, fabs_result);
    const scaled_up = fabs_result * @maxValue(u32);
    const anded = u32( scaled_up ) & 0xFFFFFFFF;

    @compileLog("sin_result", sin_result);
    @compileLog("fabs_result", fabs_result);
    @compileLog("fabs_bits", fabs_bits);
    @compileLog("scaled_up", scaled_up);
    @compileLog("anded", anded);
}


// expected value: 0xe8c7b756