Fix gcc warning -Wmissing-field-initializers

The approach that was taken here was to add default values to the type
definitions rather than specify them whenever they are missing.

Now the only remaining warning is '-Wunused-parameter' which @jade said
is usually counterproductive and that we can just disable it:
https://git.lix.systems/lix-project/lix/issues/456#issuecomment-6617

So this change adds the flags '-Wall', '-Wextra' and
'-Wno-unused-parameter', so that all warnings are enabled except for
'-Wunused-parameter'.

Change-Id: Ic223a964d67ab429e8da804c0721ba5e25d53012

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libstore/path-with-outputs.hh b/src/libstore/path-with-outputs.hh
index 57e03252d..8e2da1908 100644
--- a/src/libstore/path-with-outputs.hh
+++ b/src/libstore/path-with-outputs.hh
@@ -17,7 +17,7 @@ namespace nix {
 struct StorePathWithOutputs
 {
     StorePath path;
-    std::set<std::string> outputs;
+    std::set<std::string> outputs = {};
 
     std::string to_string(const Store & store) const;