From 423cf0be91a3cf0a4eade383591f0e7d5ea5cc33 Mon Sep 17 00:00:00 2001
From: Sosuke Suzuki <aosukeke@gmail.com>
Date: Thu, 30 Oct 2025 10:33:07 +0900
Subject: [PATCH] Enable `obj.sanitize_coverage_trace_pc_guard` for Zig

---
 build.zig | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/build.zig b/build.zig
index 0f45dce6e1..244b1743ca 100644
--- a/build.zig
+++ b/build.zig
@@ -48,6 +48,7 @@ const BunBuildOptions = struct {
     /// enable debug logs in release builds
     enable_logs: bool = false,
     enable_asan: bool,
+    enable_fuzzilli: bool,
     enable_valgrind: bool,
     use_mimalloc: bool,
     tracy_callstack_depth: u16,
@@ -97,6 +98,7 @@ const BunBuildOptions = struct {
         opts.addOption(bool, "baseline", this.isBaseline());
         opts.addOption(bool, "enable_logs", this.enable_logs);
         opts.addOption(bool, "enable_asan", this.enable_asan);
+        opts.addOption(bool, "enable_fuzzilli", this.enable_fuzzilli);
         opts.addOption(bool, "enable_valgrind", this.enable_valgrind);
         opts.addOption(bool, "use_mimalloc", this.use_mimalloc);
         opts.addOption([]const u8, "reported_nodejs_version", b.fmt("{}", .{this.reported_nodejs_version}));
@@ -271,6 +273,7 @@ pub fn build(b: *Build) !void {
         .tracy_callstack_depth = b.option(u16, "tracy_callstack_depth", "") orelse 10,
         .enable_logs = b.option(bool, "enable_logs", "Enable logs in release") orelse false,
         .enable_asan = b.option(bool, "enable_asan", "Enable asan") orelse false,
+        .enable_fuzzilli = b.option(bool, "enable_fuzzilli", "Enable Fuzzilli fuzzing support (requires asan)") orelse false,
         .enable_valgrind = b.option(bool, "enable_valgrind", "Enable valgrind") orelse false,
         .use_mimalloc = b.option(bool, "use_mimalloc", "Use mimalloc as default allocator") orelse false,
         .llvm_codegen_threads = b.option(u32, "llvm_codegen_threads", "Number of threads to use for LLVM codegen") orelse 1,
@@ -502,6 +505,7 @@ fn addMultiCheck(
                 .codegen_path = root_build_options.codegen_path,
                 .no_llvm = root_build_options.no_llvm,
                 .enable_asan = root_build_options.enable_asan,
+                .enable_fuzzilli = root_build_options.enable_fuzzilli,
                 .enable_valgrind = root_build_options.enable_valgrind,
                 .use_mimalloc = root_build_options.use_mimalloc,
                 .override_no_export_cpp_apis = root_build_options.override_no_export_cpp_apis,
@@ -626,6 +630,16 @@ fn configureObj(b: *Build, opts: *BunBuildOptions, obj: *Compile) void {
             obj.step.dependOn(&fail_step.step);
         }
     }
+
+    if (opts.enable_fuzzilli) {
+        if (!opts.enable_asan) {
+            const fail_step = b.addFail("enable_fuzzilli requires enable_asan to be enabled. Please set -Denable_asan=true");
+            obj.step.dependOn(&fail_step.step);
+        }
+        if (!enableFastBuild(b)) {
+            obj.sanitize_coverage_trace_pc_guard = true;
+        }
+    }
     obj.bundle_compiler_rt = false;
     obj.bundle_ubsan_rt = false;