From d18eb73b9949522eec5e6d86ad639878e88f60a0 Mon Sep 17 00:00:00 2001
From: Henrique Ferreiro <hferreiro@igalia.com>
Date: Tue, 14 Apr 2026 14:12:48 +0100
Subject: [PATCH] build: Reuse //base:build_date_internal for
 //copied_base/base:build_date

https://crrev.com/c/6551784 and https://crrev.com/c/6546841 modified
//base:build_date to simply copy the generated timestamp header file
from the default toolchain and avoid having to redo the work in every
toolchain.  The changes also introduced an assertion to ensure that was
the case.

In AOSP builds, that assertion fails because it uses copied_base with
the old code. This PR fixes this by reusing the same mechanism that is
already in place at //base:build_date_internal.

Bug: 495203133
---
 copied_base/base/BUILD.gn | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/copied_base/base/BUILD.gn b/copied_base/base/BUILD.gn
index 4b79af13d34e..ad916e67dca3 100644
--- a/copied_base/base/BUILD.gn
+++ b/copied_base/base/BUILD.gn
@@ -37,7 +37,6 @@ import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/sysroot.gni")
 import("//build/config/ui.gni")
 import("//build/nocompile.gni")
-import("//build/timestamp.gni")
 import("//build_overrides/build.gni")
 import("//testing/libfuzzer/fuzzer_test.gni")
 import("//testing/test.gni")
@@ -103,6 +102,8 @@ if (is_fuchsia) {
   import("//third_party/fuchsia-sdk/sdk/build/fidl_library.gni")
 }
 
+_build_date_header = "$target_gen_dir/generated_build_date.h"
+
 if (is_cobalt) {
   use_perfetto_client_library = true
   enable_log_error_not_reached = false
@@ -943,6 +944,7 @@ component("base") {
     "version.h",
     "vlog.cc",
     "vlog.h",
+    _build_date_header,
   ]
 
 
@@ -4181,15 +4183,11 @@ if (is_win && toolchain_has_rust) {
   }
 }
 
-action("build_date") {
-  script = "write_build_date_header.py"
-
-  outputs = [ "$target_gen_dir/generated_build_date.h" ]
-
-  args = [
-    rebase_path("$target_gen_dir/generated_build_date.h", root_build_dir),
-    build_timestamp,
-  ]
+copy("build_date") {
+  # Reuse the file generated by //base:build_date_internal.
+  sources = [ "$root_build_dir/gen/base/generated_build_date_internal.h" ]
+  outputs = [ _build_date_header ]
+  deps = [ "//base:build_date_internal($default_toolchain)" ]
 }
 
 if (is_android || is_robolectric) {