From 63faf31b1ecd74dd0743b2ba782eff67a44cf8e9 Mon Sep 17 00:00:00 2001
From: Tobias Mayer <tobim@fastmail.fm>
Date: Sun, 21 Jul 2024 09:03:58 +0200
Subject: [PATCH] ceph: Fix race in parallel build

---
 pkgs/tools/filesystems/ceph/default.nix | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/pkgs/tools/filesystems/ceph/default.nix b/pkgs/tools/filesystems/ceph/default.nix
index e116304f07b4..a8ed7611546e 100644
--- a/pkgs/tools/filesystems/ceph/default.nix
+++ b/pkgs/tools/filesystems/ceph/default.nix
@@ -340,8 +340,6 @@ in rec {
       graphviz
     ];
 
-    enableParallelBuilding = true;
-
     buildInputs = cryptoLibsMap.${cryptoStr} ++ [
       arrow-cpp
       babeltrace
@@ -449,6 +447,14 @@ in rec {
       ''-DWITH_XFS=${if optLibxfs != null then "ON" else "OFF"}''
     ] ++ lib.optional stdenv.isLinux "-DWITH_SYSTEM_LIBURING=ON";
 
+    preBuild =
+      # The legacy-option-headers target is not correctly empbedded in the build graph.
+      # It also contains some internal race conditions that we work around by building with `-j 1`.
+      # Upstream discussion for additional context at https://tracker.ceph.com/issues/63402.
+      ''
+        cmake --build . --target legacy-option-headers -j 1
+      '';
+
     postFixup = ''
       wrapPythonPrograms
       wrapProgram $out/bin/ceph-mgr --prefix PYTHONPATH ":" "$(toPythonPath ${placeholder "out"}):$(toPythonPath ${ceph-python-env})"