depot/third_party/nixpkgs/pkgs/development/libraries/libphonenumber/build-reproducibility.patch

--- a/tools/cpp/src/cpp-build/generate_geocoding_data.cc.orig	1970-01-01 01:00:01.000000000 +0100
+++ b/tools/cpp/src/cpp-build/generate_geocoding_data.cc	2024-01-16 19:03:45.409089423 +0100
@@ -94,7 +94,8 @@
   DirEntryKinds kind_;
 };
 
-// Lists directory entries in path. "." and ".." are excluded. Returns true on
+// Lists directory entries in path. "." and ".." are excluded. Entries are
+// returned in a consistent order to ensure reproducibility. Returns true on
 // success.
 bool ListDirectory(const string& path, vector<DirEntry>* entries) {
   entries->clear();
@@ -114,8 +115,14 @@
     // http://pubs.opengroup.org/onlinepubs/9699919799/functions/readdir.html
     errno = 0;
     entry = readdir(dir);
+    if (errno != 0) {
+      return false;
+    }
     if (entry == NULL) {
-      return errno == 0;
+      std::sort(
+          entries->begin(), entries->end(),
+          [](const DirEntry& a, const DirEntry& b) { return a.name() < b.name(); });
+      return true;
     }
     if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0) {
        continue;