From c685b675e547f61c81c5fb63159bc12b26405100 Mon Sep 17 00:00:00 2001
From: Michael Dusan <michael.dusan@gmail.com>
Date: Tue, 15 Aug 2023 17:20:05 -0400
Subject: [PATCH] std.debug: avoid os.getFdPath

Commit ea9917d9bd921f9fc14028a8dbf9e3f0f2579120 introduced usage
of fs.Dir.realpath which eventually calls os.getFdpath which is
forbidden to be used by the compiler. It causes building zig to fail on
OpenBsd, NetBSD and older versions of FreeBSD and DragonFly.

This patch substitutes with os.realpath on libc targets and eventually
calls c.realpath and allows zig to build. Any use of realpath is not
desired but this is the lesser evil.
---
 lib/std/debug.zig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/std/debug.zig b/lib/std/debug.zig
index db9b93dff6..0657d667c2 100644
--- a/lib/std/debug.zig
+++ b/lib/std/debug.zig
@@ -1228,7 +1228,7 @@ pub fn readElfDebugInfo(
                 }
 
                 var cwd_buf: [fs.MAX_PATH_BYTES]u8 = undefined;
-                const cwd_path = fs.cwd().realpath("", &cwd_buf) catch break :blk;
+                const cwd_path = os.realpath(".", &cwd_buf) catch break :blk;
 
                 // <global debug directory>/<absolute folder of current binary>/<gnu_debuglink>
                 for (global_debug_directories) |global_directory| {