From e920e287347481f8bcfee3d126d0193678b2c619 Mon Sep 17 00:00:00 2001
From: Sergei Zimmerman <sergei@zimmerman.foo>
Date: Sun, 20 Jul 2025 21:16:20 +0300
Subject: [PATCH] libutil: Speed up builds by using precompiled headers

---
 src/libutil/meson.build                | 1 +
 src/libutil/pch/precompiled-headers.hh | 7 +++++++
 2 files changed, 8 insertions(+)
 create mode 100644 src/libutil/pch/precompiled-headers.hh

diff --git a/src/libutil/meson.build b/src/libutil/meson.build
index f48c8f3d7..ced9c424d 100644
--- a/src/libutil/meson.build
+++ b/src/libutil/meson.build
@@ -191,6 +191,7 @@ this_library = library(
   link_args: linker_export_flags,
   prelink : true, # For C++ static initializers
   install : true,
+  cpp_pch : 'pch/precompiled-headers.hh'
 )
 
 install_headers(headers, subdir : 'nix/util', preserve_path : true)
diff --git a/src/libutil/pch/precompiled-headers.hh b/src/libutil/pch/precompiled-headers.hh
new file mode 100644
index 000000000..75e905386
--- /dev/null
+++ b/src/libutil/pch/precompiled-headers.hh
@@ -0,0 +1,7 @@
+#include "nix/util/util.hh"
+#include "nix/util/file-system.hh"
+#include "nix/util/serialise.hh"
+#include "nix/util/signals.hh"
+#include "nix/util/source-accessor.hh"
+
+#include <nlohmann/json.hpp>