From 54865e0483bf02bc1ace9f06c00071fce32534cc Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Wed, 17 Dec 2025 23:23:32 -0800
Subject: [PATCH] compiler: fix compilation when linking libc

---
 lib/compiler/test_runner.zig |  2 +-
 lib/std/Io/Threaded.zig      |  4 ++--
 lib/std/testing.zig          | 15 ++++++++++-----
 src/Compilation.zig          |  6 +++---
 4 files changed, 16 insertions(+), 11 deletions(-)

diff --git a/lib/compiler/test_runner.zig b/lib/compiler/test_runner.zig
index 3d97944a7f..d16fc3ae82 100644
--- a/lib/compiler/test_runner.zig
+++ b/lib/compiler/test_runner.zig
@@ -224,7 +224,7 @@ fn mainTerminal() void {
     var skip_count: usize = 0;
     var fail_count: usize = 0;
     var fuzz_count: usize = 0;
-    const root_node = if (builtin.fuzz) std.Progress.Node.none else std.Progress.start(.{
+    const root_node = if (builtin.fuzz) std.Progress.Node.none else std.Progress.start(runner_threaded_io.io(), .{
         .root_name = "Test",
         .estimated_total_items = test_fn_list.len,
     });
diff --git a/lib/std/Io/Threaded.zig b/lib/std/Io/Threaded.zig
index ca10272b33..36118ca818 100644
--- a/lib/std/Io/Threaded.zig
+++ b/lib/std/Io/Threaded.zig
@@ -6804,7 +6804,7 @@ fn fileWritePositional(
 
     try current_thread.beginSyscall();
     while (true) {
-        const rc = pwritev_sym(file.handle, &iovecs, iovlen, @bitCast(offset));
+        const rc = pwritev_sym(file.handle, &iovecs, @intCast(iovlen), @bitCast(offset));
         switch (posix.errno(rc)) {
             .SUCCESS => {
                 current_thread.endSyscall();
@@ -6923,7 +6923,7 @@ fn fileWriteStreaming(
 
     try current_thread.beginSyscall();
     while (true) {
-        const rc = posix.system.writev(file.handle, &iovecs, iovlen);
+        const rc = posix.system.writev(file.handle, &iovecs, @intCast(iovlen));
         switch (posix.errno(rc)) {
             .SUCCESS => {
                 current_thread.endSyscall();
diff --git a/lib/std/testing.zig b/lib/std/testing.zig
index 98fca2f2d5..f3dd114af3 100644
--- a/lib/std/testing.zig
+++ b/lib/std/testing.zig
@@ -370,7 +370,8 @@ pub fn expectEqualSlices(comptime T: type, expected: []const T, actual: []const
     if (!backend_can_print) return error.TestExpectedEqual;
     if (io.lockStderr(&.{}, null)) |stderr| {
         defer io.unlockStderr();
-        failEqualSlices(T, expected, actual, diff_index, &stderr.interface, stderr.mode) catch {};
+        const w = &stderr.file_writer.interface;
+        failEqualSlices(T, expected, actual, diff_index, w, stderr.terminal_mode) catch {};
     } else |_| {}
     return error.TestExpectedEqual;
 }
@@ -475,13 +476,13 @@ fn SliceDiffer(comptime T: type) type {
             for (self.expected, 0..) |value, i| {
                 const full_index = self.start_index + i;
                 const diff = if (i < self.actual.len) !std.meta.eql(self.actual[i], value) else true;
-                if (diff) try t.setColor(writer, .red);
+                if (diff) try t.setColor(.red);
                 if (@typeInfo(T) == .pointer) {
                     try writer.print("[{}]{*}: {any}\n", .{ full_index, value, value });
                 } else {
                     try writer.print("[{}]: {any}\n", .{ full_index, value });
                 }
-                if (diff) try t.setColor(writer, .reset);
+                if (diff) try t.setColor(.reset);
             }
         }
     };
@@ -538,10 +539,14 @@ const BytesDiffer = struct {
         }
     }
 
+    fn terminal(self: *const BytesDiffer, writer: *Io.Writer) Io.Terminal {
+        return .{ .writer = writer, .mode = self.terminal_mode };
+    }
+
     fn writeDiff(self: BytesDiffer, writer: *Io.Writer, comptime fmt: []const u8, args: anytype, diff: bool) !void {
-        if (diff) try self.file_writer_mode.setColor(writer, .red);
+        if (diff) try self.terminal(writer).setColor(.red);
         try writer.print(fmt, args);
-        if (diff) try self.file_writer_mode.setColor(writer, .reset);
+        if (diff) try self.terminal(writer).setColor(.reset);
     }
 };
 
diff --git a/src/Compilation.zig b/src/Compilation.zig
index a78bf19e66..dc254a36c5 100644
--- a/src/Compilation.zig
+++ b/src/Compilation.zig
@@ -6270,7 +6270,7 @@ fn updateCObject(comp: *Compilation, c_object: *CObject, c_obj_prog_node: std.Pr
             }
 
             if (comp.verbose_cc) {
-                dumpArgv(io, argv.items);
+                try dumpArgv(io, argv.items);
             }
 
             const err = std.process.execv(arena, argv.items);
@@ -6316,7 +6316,7 @@ fn updateCObject(comp: *Compilation, c_object: *CObject, c_obj_prog_node: std.Pr
         }
 
         if (comp.verbose_cc) {
-            dumpArgv(io, argv.items);
+            try dumpArgv(io, argv.items);
         }
 
         // Just to save disk space, we delete the files that are never needed again.
@@ -6358,7 +6358,7 @@ fn updateCObject(comp: *Compilation, c_object: *CObject, c_obj_prog_node: std.Pr
                 var stderr_reader = child.stderr.?.readerStreaming(io, &.{});
                 const stderr = try stderr_reader.interface.allocRemaining(arena, .limited(std.math.maxInt(u32)));
 
-                const term = child.wait() catch |err| {
+                const term = child.wait(io) catch |err| {
                     return comp.failCObj(c_object, "failed to spawn zig clang {s}: {s}", .{ argv.items[0], @errorName(err) });
                 };