Build: fail tests that log errors, like zig test does

Author: jacobly0

lib/std/Build/Step.zig

@@ -45,10 +45,11 @@ pub const TestResults = struct {
     fail_count: u32 = 0,
     skip_count: u32 = 0,
     leak_count: u32 = 0,
+    log_err_count: u32 = 0,
     test_count: u32 = 0,
 
     pub fn isSuccess(tr: TestResults) bool {
-        return tr.fail_count == 0 and tr.leak_count == 0;
+        return tr.fail_count == 0 and tr.leak_count == 0 and tr.log_err_count == 0;
     }
 
     pub fn passCount(tr: TestResults) u32 {

lib/std/Build/Step/Run.zig

@@ -1048,6 +1048,7 @@ fn evalZigTest(
     var skip_count: u32 = 0;
     var leak_count: u32 = 0;
     var test_count: u32 = 0;
+    var log_err_count: u32 = 0;
 
     var metadata: ?TestMetadata = null;
 
@@ -1112,14 +1113,22 @@ fn evalZigTest(
 
                 const TrHdr = std.zig.Server.Message.TestResults;
                 const tr_hdr = @as(*align(1) const TrHdr, @ptrCast(body));
-                fail_count += @intFromBool(tr_hdr.flags.fail);
-                skip_count += @intFromBool(tr_hdr.flags.skip);
-                leak_count += @intFromBool(tr_hdr.flags.leak);
+                fail_count +|= @intFromBool(tr_hdr.flags.fail);
+                skip_count +|= @intFromBool(tr_hdr.flags.skip);
+                leak_count +|= @intFromBool(tr_hdr.flags.leak);
+                log_err_count +|= tr_hdr.flags.log_err_count;
 
-                if (tr_hdr.flags.fail or tr_hdr.flags.leak) {
+                if (tr_hdr.flags.fail or tr_hdr.flags.leak or tr_hdr.flags.log_err_count > 0) {
                     const name = std.mem.sliceTo(md.string_bytes[md.names[tr_hdr.index]..], 0);
                     const msg = std.mem.trim(u8, stderr.readableSlice(0), "\n");
-                    const label = if (tr_hdr.flags.fail) "failed" else "leaked";
+                    const label = if (tr_hdr.flags.fail)
+                        "failed"
+                    else if (tr_hdr.flags.leak)
+                        "leaked"
+                    else if (tr_hdr.flags.log_err_count > 0)
+                        "logged errors"
+                    else
+                        unreachable;
                     if (msg.len > 0) {
                         try self.step.addError("'{s}' {s}: {s}", .{ name, label, msg });
                     } else {
@@ -1153,6 +1162,7 @@ fn evalZigTest(
             .fail_count = fail_count,
             .skip_count = skip_count,
             .leak_count = leak_count,
+            .log_err_count = log_err_count,
         },
         .test_metadata = metadata,
     };

lib/std/zig/Server.zig

@@ -53,12 +53,11 @@ pub const Message = struct {
         index: u32,
         flags: Flags,
 
-        pub const Flags = packed struct(u8) {
+        pub const Flags = packed struct(u32) {
             fail: bool,
             skip: bool,
             leak: bool,
-
-            reserved: u5 = 0,
+            log_err_count: u29 = 0,
         };
     };
 

lib/test_runner.zig

@@ -90,6 +90,7 @@ fn mainServer() !void {
 
             .run_test => {
                 std.testing.allocator_instance = .{};
+                log_err_count = 0;
                 const index = try server.receiveBody_u32();
                 const test_fn = builtin.test_functions[index];
                 if (test_fn.async_frame_size != null)
@@ -113,6 +114,10 @@ fn mainServer() !void {
                         .fail = fail,
                         .skip = skip,
                         .leak = leak,
+                        .log_err_count = std.math.lossyCast(std.meta.FieldType(
+                            std.zig.Server.Message.TestResults.Flags,
+                            .log_err_count,
+                        ), log_err_count),
                     },
                 });
             },
@@ -218,7 +223,7 @@ pub fn log(
     args: anytype,
 ) void {
     if (@intFromEnum(message_level) <= @intFromEnum(std.log.Level.err)) {
-        log_err_count += 1;
+        log_err_count +|= 1;
     }
     if (@intFromEnum(message_level) <= @intFromEnum(std.testing.log_level)) {
         std.debug.print(