From ba293eb820e5c2f62ac7a8ef623d8bffde3dc4f1 Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Wed, 11 Feb 2026 10:44:04 -0800
Subject: [PATCH] Revert "compiler: override debug_io in release + evented
 mode"

This reverts commit 68403267117bf5cf73e0f747887f2834336ae4a2.

The commit bungled deinitialization in main.
---
 lib/std/debug/ElfFile.zig |  6 +-----
 src/main.zig              | 19 +++++--------------
 2 files changed, 6 insertions(+), 19 deletions(-)

diff --git a/lib/std/debug/ElfFile.zig b/lib/std/debug/ElfFile.zig
index 6d8ed0bdce85ee7b0fdaca22a2247fc767a8ef8e..892510601591bc305a0331dea4a95e0992f65765 100644
--- a/lib/std/debug/ElfFile.zig
+++ b/lib/std/debug/ElfFile.zig
@@ -86,11 +86,7 @@ pub const DebugInfoSearchPaths = struct {
             },
             .exe_dir = std.fs.path.dirname(exe_path) orelse ".",
         };
-        return .{
-            .debuginfod_client = null,
-            .global_debug = &.{"/usr/lib/debug"},
-            .exe_dir = std.fs.path.dirname(exe_path) orelse ".",
-        };
+        @compileError("std.Options.elf_debug_info_search_paths must be provided");
     }
 };
 
diff --git a/src/main.zig b/src/main.zig
index c49bb0f03393702eca6ab03af27cf6f97fd03603..82a1fcf0503c1c88eb074d4334d85ebd00cfa30a 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -51,17 +51,6 @@ pub const std_options: std.Options = .{
     },
 };
 pub const std_options_cwd = if (native_os == .wasi) wasi_cwd else null;
-pub const std_options_debug_threaded_io: ?*Io.Threaded = switch (build_options.io_mode) {
-    .threaded => &io_impl,
-    .evented => switch (builtin.mode) {
-        .Debug => Io.Threaded.global_single_threaded,
-        .ReleaseFast, .ReleaseSmall, .ReleaseSafe => null,
-    },
-};
-pub const std_options_debug_io: Io = switch (build_options.io_mode) {
-    .threaded => io_impl.ioBasic(),
-    .evented => io_impl.io(),
-};
 
 pub const debug = struct {
     pub fn printCrashContext(terminal: Io.Terminal) void {
@@ -200,6 +189,7 @@ pub fn main(init: std.process.Init.Minimal) anyerror!void {
     var root_allocator: RootAllocator = .init;
     defer _ = root_allocator.deinit();
     const root_gpa = root_allocator.allocator();
+    var io_impl: IoImpl = undefined;
     switch (build_options.io_mode) {
         .threaded => io_impl = .init(root_gpa, .{
             .stack_size = thread_stack_size,
@@ -215,6 +205,7 @@ pub fn main(init: std.process.Init.Minimal) anyerror!void {
         }),
     }
     defer io_impl.deinit();
+    io_impl_ptr = &io_impl;
     const io = io_impl.io();
     const gpa = switch (build_options.io_mode) {
         .threaded => root_gpa,
@@ -7824,7 +7815,7 @@ const IoImpl = switch (build_options.io_mode) {
     .threaded => Io.Threaded,
     .evented => Io.Evented,
 };
-var io_impl: IoImpl = undefined;
+var io_impl_ptr: *IoImpl = undefined;
 fn setThreadLimit(arena: std.mem.Allocator, n: usize) Allocator.Error!void {
     switch (build_options.io_mode) {
         .threaded => {
@@ -7833,8 +7824,8 @@ fn setThreadLimit(arena: std.mem.Allocator, n: usize) Allocator.Error!void {
             // linker can run concurrently, so we need to set both the async *and* the
             // concurrency limit.
             const limit: Io.Limit = .limited(n - 1);
-            io_impl.setAsyncLimit(limit);
-            io_impl.concurrent_limit = limit;
+            io_impl_ptr.setAsyncLimit(limit);
+            io_impl_ptr.concurrent_limit = limit;
         },
         .evented => {},
     }
-- 
2.54.0