From f8b48ebec63b395a6565bb01e65b1d284e176ec3 Mon Sep 17 00:00:00 2001
From: Jarred Sumner <jarred@jarredsumner.com>
Date: Wed, 16 Feb 2022 04:03:35 -0800
Subject: [PATCH] Save LLVM IR in debug build

---
 build.zig | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/build.zig b/build.zig
index f58a1b4a87..aa8b776c59 100644
--- a/build.zig
+++ b/build.zig
@@ -278,6 +278,10 @@ pub fn build(b: *std.build.Builder) !void {
         obj.setBuildMode(mode);
         obj.linkLibC();
         obj.linkLibCpp();
+        if (mode == std.builtin.Mode.Debug)
+            obj.emit_llvm_ir = .{
+                .emit_to = try std.fmt.allocPrint(b.allocator, "{s}/{s}.ll", .{ output_dir, bun_executable_name }),
+            };
 
         obj.strip = false;
         obj.bundle_compiler_rt = true;