From f13aeaf2f1e43032454bc53d2832f01e114a9817 Mon Sep 17 00:00:00 2001
From: Sergei Zimmerman <sergei@zimmerman.foo>
Date: Sun, 17 Aug 2025 00:57:06 +0300
Subject: [PATCH] libutil-tests: Improve compile times with PCH

(Before)

**** Time summary:
Compilation (30 times):
  Parsing (frontend):           98.2 s
  Codegen & opts (backend):     27.7 s

(After)

**** Time summary:
Compilation (31 times):
  Parsing (frontend):           34.9 s
  Codegen & opts (backend):     28.1 s
---
 src/libutil-tests/meson.build                | 1 +
 src/libutil-tests/pch/precompiled-headers.hh | 5 +++++
 2 files changed, 6 insertions(+)
 create mode 100644 src/libutil-tests/pch/precompiled-headers.hh

diff --git a/src/libutil-tests/meson.build b/src/libutil-tests/meson.build
index e4a060d3e..6f04b46fd 100644
--- a/src/libutil-tests/meson.build
+++ b/src/libutil-tests/meson.build
@@ -89,6 +89,7 @@ this_exe = executable(
   link_args : linker_export_flags + [ '-lrapidcheck' ],
   # get main from gtest
   install : true,
+  cpp_pch : do_pch ? [ 'pch/precompiled-headers.hh' ] : [],
 )
 
 test(
diff --git a/src/libutil-tests/pch/precompiled-headers.hh b/src/libutil-tests/pch/precompiled-headers.hh
new file mode 100644
index 000000000..0a078fcc4
--- /dev/null
+++ b/src/libutil-tests/pch/precompiled-headers.hh
@@ -0,0 +1,5 @@
+#include "nix/util/util.hh"
+
+#include <gtest/gtest.h>
+#include <gmock/gmock.h>
+#include <rapidcheck/gtest.h>