std.Build: add --seed argument to randomize step dependencies spawning #16817
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That's what Lines 271 to 273 in 615372a is about, am I missing something ? |
Yeah- specifically the Zig CLI should choose the seed, so that when the build fails, the command to reproduce the issue includes the In src/main.zig, in the |
lib/build_runner.zig
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| std.debug.print("Expected u32 after {s}\n\n", .{arg}); | ||
| usageAndErr(builder, false, stderr_stream); | ||
| }; | ||
| seed = std.fmt.parseUnsigned(u32, next_arg, 10) catch |err| { |
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| seed = std.fmt.parseUnsigned(u32, next_arg, 10) catch |err| { | |
| seed = std.fmt.parseUnsigned(u32, next_arg, 0) catch |err| { |
This will allow the user to use hexadecimal notation and a few others supported by parseUnsigned.
| }; | ||
| seed = std.fmt.parseUnsigned(u32, next_arg, 10) catch |err| { | ||
| std.debug.print("unable to parse seed '{s}' as u32: {s}", .{ next_arg, @errorName(err) }); | ||
| process.exit(1); |
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Please follow the pattern of error handling above and below for failure to parse user arguments. If you want to change all of them to not print the usage, please do that in a separate PR.
src/main.zig
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| const micros: u32 = @truncate(@as(u64, @bitCast(std.time.microTimestamp()))); | ||
| var seed: []const u8 = try std.fmt.allocPrint(arena, "{}", .{micros}); |
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Please use std.crypto.random.int(u32).
andrewrk
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help detect possibly hidden dependencies on the running order of steps, especially in -j1 mode
* support 0x prefixed hex code for CLI seed arguments * don't change the build summary; the printed CLI on build runner failure is sufficient * use `std.crypto.random` instead of system time for entropy
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Closes #14940