os/bluestore/BlueStore: make maybe unused variable [[maybe_unused]]

cct is defined so it can be used by dout(), but when the source code is
compiled for crimson, dout() does not use cct at all, so in that case,
compiler complains like:

../src/os/bluestore/BlueStore.cc:17413:8: warning: unused variable 'cct' [-Wunused-variable]
  auto cct  = onode->c->store->cct;
       ^
1 warning generated.

in this change, cct is marked with [[maybe_unused]] to silence this
warning.

Signed-off-by: Kefu Chai <kchai@redhat.com>

diff --git a/src/os/bluestore/BlueStore.cc b/src/os/bluestore/BlueStore.cc
index 4f0b410e478afc85bdd697dbda7efbd241d6ca4b..926b61ed3b678ed635af791725fe7d522fe3f54c 100644 (file)
--- a/src/os/bluestore/BlueStore.cc
+++ b/src/os/bluestore/BlueStore.cc
@@ -17410,7 +17410,7 @@ int BlueStore::restore_allocator(Allocator* allocator, uint64_t *num, uint64_t *
 //-------------------------------------------------------------------------
 void BlueStore::ExtentMap::provide_shard_info_to_onode(bufferlist v, uint32_t shard_id)
 {
-  auto cct  = onode->c->store->cct;
+  [[maybe_unused]] auto cct  = onode->c->store->cct;
   auto path = onode->c->store->path;
   if (shard_id < shards.size()) {
     auto p = &shards[shard_id];