Due to c++17 eval order in gcc 7 we need to be more careful.

From gcc 7 release notes.
"The C++17 evaluation order requirements can be selected in other modes with the -fstrong-eval-order flag, or disabled in C++17 mode with -fno-strong-eval-order."

1 files changed, 3 insertions, 2 deletions

diff --git a/vdslib/src/vespa/vdslib/distribution/group.cpp b/vdslib/src/vespa/vdslib/distribution/group.cpp
index b1a81c85dbb..8ad3dcb2f80 100644
--- a/vdslib/src/vespa/vdslib/distribution/group.cpp
+++ b/vdslib/src/vespa/vdslib/distribution/group.cpp
@@ -116,7 +116,8 @@ Group::addSubGroup(Group::UP group)
                 "Another subgroup with same index is already added.",
                 VESPA_STRLOC);
     }
-    _subGroups[group->getIndex()] = group.release();
+    auto index = group->getIndex();
+    _subGroups[index] = group.release();
 }
 
 void
@@ -203,4 +204,4 @@ Group::getDistributionConfigHash() const {
 }
 
 }
-}
\ No newline at end of file
+}