edencommon: patch to increase test discovery timeout

For some reason, this build is incredibly flaky on `x86_64-darwin`,
possibly because of the recent `staging-next` merge, failing with a
test discovery timeout error both on Hydra and locally. The default
discovery timeout is apparently 5 seconds, so let’s try giving it
5 times as long and see if that helps.

pkgs/development/libraries/edencommon/default.nix

@@ -20,6 +20,11 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-1z4QicS98juv4bUEbHBkCjVJHEhnoJyLYp4zMHmDbMg=";
   };
 
+  patches = lib.optionals (stdenv.isDarwin && stdenv.isx86_64) [
+    # Test discovery timeout is bizarrely flaky on `x86_64-darwin`
+    ./increase-test-discovery-timeout.patch
+  ];
+
   nativeBuildInputs = [ cmake ];
 
   cmakeFlags = lib.optionals stdenv.isDarwin [

pkgs/development/libraries/edencommon/increase-test-discovery-timeout.patch

@@ -0,0 +1,20 @@
+diff --git a/eden/common/os/test/CMakeLists.txt b/eden/common/os/test/CMakeLists.txt
+index a9f71443f8..be1423c455 100644
+--- a/eden/common/os/test/CMakeLists.txt
++++ b/eden/common/os/test/CMakeLists.txt
+@@ -18,4 +18,4 @@
+     ${LIBGMOCK_LIBRARIES}
+ )
+ 
+-gtest_discover_tests(os_test)
++gtest_discover_tests(os_test DISCOVERY_TIMEOUT 25)
+diff --git a/eden/common/utils/test/CMakeLists.txt b/eden/common/utils/test/CMakeLists.txt
+index 0cac73e569..ff08ecccb8 100644
+--- a/eden/common/utils/test/CMakeLists.txt
++++ b/eden/common/utils/test/CMakeLists.txt
+@@ -34,4 +34,4 @@
+     ${LIBGMOCK_LIBRARIES}
+ )
+ 
+-gtest_discover_tests(utils_test)
++gtest_discover_tests(utils_test DISCOVERY_TIMEOUT 25)