abnormal size in freestanding/ReleaseSmall mode when accessing a slice

[pierrec]

Zig Version

0.13.0

Steps to Reproduce and Observed Behavior

The following pieces of code generates much different sizes (build.zig at the end (for some reason I cannot attach the files)):

var font: *Font = undefined;
var glyphs: []u8 = undefined;

const Font = struct {
    glyphs: u8 = 0,
};

export fn _start() callconv(.C) void {
    glyphs = @as([*]u8, @ptrCast(&font.glyphs))[0..10];
    //_ = glyphs[1];
}

var font: *Font = undefined;
var glyphs: []u8 = undefined;

const Font = struct {
    glyphs: u8 = 0,
};

export fn _start() callconv(.C) void {
    glyphs = @as([*]u8, @ptrCast(&font.glyphs))[0..10];
    _ = glyphs[1];
}

As seen here:

 % zig build
 % ls -l zig-out/bin
total 16
-rwxr-xr-x  1 pierre  staff  7976 Jun  9 21:17 build
 % zig build
 % ls -l zig-out/bin
total 1760
-rwxr-xr-x  1 pierre  staff  897984 Jun  9 21:18 build

Build file:

const std = @import("std");

pub fn build(b: *std.Build) void {
    const target = b.standardTargetOptions(.{ .default_target = .{
        .os_tag = .freestanding,
    } });
    const optimize = b.standardOptimizeOption(.{
        .preferred_optimize_mode = .ReleaseSmall,
    });
    const exe = b.addExecutable(.{
        .name = "build",
        .root_source_file = b.path("main.zig"),
        .target = target,
        .optimize = optimize,
    });
    b.installArtifact(exe);
}

Expected Behavior

A slight increase in size when accessing the glyphs slice.

[xdBronch]

.preferred_optimize_mode = .ReleaseSmall does not actually set the default optimize mode but rather changes the CLI flag to a boolean release/not release option. either build with -Drelease or set the optimize mode directly

-.optimize = optimize,
+.optimize = .ReleaseSmall,

[pierrec]

omg that was it... Sorry about the noise.

[xdBronch]

dont worry about it, youre definitely not the first to be confused by the naming of that setting