From f5a941b3d6238222f43da568c96cfa5b3e56ce5d Mon Sep 17 00:00:00 2001
From: mlugg <mlugg@mlugg.co.uk>
Date: Thu, 18 Jul 2024 18:45:07 +0100
Subject: [PATCH] Sema: return module-relative path for `@src()`

This is one possible approach to fixing an issue with reproducible
builds where the compiler's cwd changes the paths returned by `@src()`.
---
 src/Sema.zig | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/Sema.zig b/src/Sema.zig
index 2b43b75132..b2603a98a8 100644
--- a/src/Sema.zig
+++ b/src/Sema.zig
@@ -17787,8 +17787,7 @@ fn zirBuiltinSrc(
     };
 
     const file_name_val = v: {
-        // The compiler must not call realpath anywhere.
-        const file_name = try fn_owner_decl.getFileScope(mod).fullPath(sema.arena);
+        const file_name = fn_owner_decl.getFileScope(mod).sub_file_path;
         const array_ty = try pt.intern(.{ .array_type = .{
             .len = file_name.len,
             .sentinel = .zero_u8,