build: setOutputDir causes barfing

Latest master 0.6.0+0e2d858d6 prebuilt binary on Mac. I say it barfs because I'm not really sure what's going on, there's a big stack(?) dump with a bunch of different errors in it, including OOM errors. I haven't looked into the cause myself yet.

setOutputDir doesn't work no matter whether it's "zig-cache" or "." or anything else, and whether the folder exists or not. It does get as far as creating the folder if it doesn't exist though.

build.zig:

const std = @import("std");

pub fn build(b: *std.build.Builder) void {
    var o = b.addExecutable("main", "main.zig");
    o.setOutputDir("build"); // comment this out and it works
    b.step("main", "Main").dependOn(&o.step);
}

main.zig:

const std = @import("std");

pub fn main() !void {
    std.debug.warn("hi\n", .{});
}

Output of zig build main:

error: FileNotFound
/Users/dbandstra/zig-macos-x86_64-0.6.0+0e2d858d6/lib/zig/std/heap/arena_allocator.zig:104:17: 0x10072d9e2 in std.heap.arena_allocator.ArenaAllocator.resize (build)
                return error.OutOfMemory;
                ^
/Users/dbandstra/zig-macos-x86_64-0.6.0+0e2d858d6/lib/zig/std/heap/arena_allocator.zig:104:17: 0x10072d9e2 in std.heap.arena_allocator.ArenaAllocator.resize (build)
                return error.OutOfMemory;
                ^
/Users/dbandstra/zig-macos-x86_64-0.6.0+0e2d858d6/lib/zig/std/heap.zig:270:9: 0x100713638 in std.heap.PageAllocator.resize (build)
        return error.OutOfMemory;
        ^
/Users/dbandstra/zig-macos-x86_64-0.6.0+0e2d858d6/lib/zig/std/mem/Allocator.zig:319:16: 0x10075f0b2 in std.mem.Allocator.resize (build)
    const rc = try self.resizeFn(self, old_byte_slice, Slice.alignment, new_byte_count, 0, @returnAddress());
               ^
/Users/dbandstra/zig-macos-x86_64-0.6.0+0e2d858d6/lib/zig/std/os.zig:2122:19: 0x100729f38 in std.os.mkdiratZ (build)
        EEXIST => return error.PathAlreadyExists,
                  ^
/Users/dbandstra/zig-macos-x86_64-0.6.0+0e2d858d6/lib/zig/std/os.zig:2083:9: 0x100729bc0 in std.os.mkdirat (build)
        return mkdiratZ(dir_fd, &sub_dir_path_c, mode);
        ^
/Users/dbandstra/zig-macos-x86_64-0.6.0+0e2d858d6/lib/zig/std/fs.zig:922:9: 0x100729a36 in std.fs.Dir.makeDir (build)
        try os.mkdirat(self.fd, sub_path, default_new_dir_mode);
        ^
/Users/dbandstra/zig-macos-x86_64-0.6.0+0e2d858d6/lib/zig/std/heap.zig:270:9: 0x100713638 in std.heap.PageAllocator.resize (build)
        return error.OutOfMemory;
        ^
/Users/dbandstra/zig-macos-x86_64-0.6.0+0e2d858d6/lib/zig/std/mem/Allocator.zig:319:16: 0x10075f0b2 in std.mem.Allocator.resize (build)
    const rc = try self.resizeFn(self, old_byte_slice, Slice.alignment, new_byte_count, 0, @returnAddress());
               ^
/Users/dbandstra/zig-macos-x86_64-0.6.0+0e2d858d6/lib/zig/std/os.zig:2122:19: 0x100729f38 in std.os.mkdiratZ (build)
        EEXIST => return error.PathAlreadyExists,
                  ^
/Users/dbandstra/zig-macos-x86_64-0.6.0+0e2d858d6/lib/zig/std/os.zig:2083:9: 0x100729bc0 in std.os.mkdirat (build)
        return mkdiratZ(dir_fd, &sub_dir_path_c, mode);
        ^
/Users/dbandstra/zig-macos-x86_64-0.6.0+0e2d858d6/lib/zig/std/fs.zig:922:9: 0x100729a36 in std.fs.Dir.makeDir (build)
        try os.mkdirat(self.fd, sub_path, default_new_dir_mode);
        ^
/Users/dbandstra/zig-macos-x86_64-0.6.0+0e2d858d6/lib/zig/std/os.zig:1193:23: 0x10076726e in std.os.openatZ (build)
            ENOENT => return error.FileNotFound,
                      ^
/Users/dbandstra/zig-macos-x86_64-0.6.0+0e2d858d6/lib/zig/std/fs.zig:754:13: 0x10073975e in std.fs.Dir.openFileZ (build)
            try os.openatZ(self.fd, sub_path, os_flags, 0);
            ^
/Users/dbandstra/zig-macos-x86_64-0.6.0+0e2d858d6/lib/zig/std/fs.zig:687:9: 0x10073837b in std.fs.Dir.openFile (build)
        return self.openFileZ(&path_c, flags);
        ^
/Users/dbandstra/zig-macos-x86_64-0.6.0+0e2d858d6/lib/zig/std/fs.zig:1765:24: 0x10077cd41 in std.fs.Dir.updateFile (build)
        var src_file = try source_dir.openFile(source_path, .{});
                       ^
/Users/dbandstra/zig-macos-x86_64-0.6.0+0e2d858d6/lib/zig/std/build.zig:2342:25: 0x10077741a in std.build.LibExeObjStep.make (build)
                    _ = try src_dir.updateFile(entry.name, dest_dir, entry.name, .{});
                        ^
/Users/dbandstra/zig-macos-x86_64-0.6.0+0e2d858d6/lib/zig/std/build.zig:2595:9: 0x10072b03e in std.build.Step.make (build)
        try self.makeFn(self);
        ^
/Users/dbandstra/zig-macos-x86_64-0.6.0+0e2d858d6/lib/zig/std/build.zig:417:9: 0x100729390 in std.build.Builder.makeOneStep (build)
        try s.make();
        ^
/Users/dbandstra/zig-macos-x86_64-0.6.0+0e2d858d6/lib/zig/std/build.zig:411:17: 0x10072930f in std.build.Builder.makeOneStep (build)
                return err;
                ^
/Users/dbandstra/zig-macos-x86_64-0.6.0+0e2d858d6/lib/zig/std/build.zig:372:13: 0x100718d81 in std.build.Builder.make (build)
            try self.makeOneStep(s);
            ^
/Users/dbandstra/zig-macos-x86_64-0.6.0+0e2d858d6/lib/zig/std/special/build_runner.zig:130:21: 0x100714ca7 in main (build)
            else => return err,
                    ^
error: the following build command failed with exit code 1:
/Users/dbandstra/code/simple_project/zig-cache/o/4dfead05ab1bbb6a3a735f2f30843ca8/build /Users/dbandstra/zig-macos-x86_64-0.6.0+0e2d858d6/zig /Users/dbandstra/code/simple_project /Users/dbandstra/code/simple_project/zig-cache main

[FireFox317]

Duplicate: #6493. Fixed in #6510 by me, but Andrew is coming up with the proper solution

Whoops, missed that one, thanks!