imports: Switch to Microsoft GSL implementation

... with two minor code base changes compared to previous
use of gsl-lite:

- dag.hpp: ActionNode::Ptr and ArtifactNode::Ptr are not
  wrapped in gsl::not_null<> anymore, due to lack of support
  for wrapping std::unique_ptr<>. More specifically, the
  move constructor is missing, rendering it impossible to
  use std::vector<>::emplace_back().

- utils/cpp/gsl.hpp: New header file added to implement the
  macros ExpectsAudit() and EnsureAudit(), asserts running
  only in debug builds, which were available in gsl-lite but
  are missing in MS GSL.

6 files changed, 13 insertions, 11 deletions

diff --git a/src/buildtool/execution_api/local/TARGETS b/src/buildtool/execution_api/local/TARGETS
index 3109afca..b9e056b8 100644
--- a/src/buildtool/execution_api/local/TARGETS
+++ b/src/buildtool/execution_api/local/TARGETS
@@ -5,7 +5,7 @@
   , "deps":
     [ ["@", "fmt", "", "fmt"]
     , ["@", "json", "", "json"]
-    , ["@", "gsl-lite", "", "gsl-lite"]
+    , ["@", "gsl", "", "gsl"]
     , ["src/buildtool/common", "common"]
     , ["src/buildtool/file_system", "file_system_manager"]
     , ["src/buildtool/file_system", "object_type"]
@@ -25,7 +25,7 @@
   , "srcs": ["local_action.cpp"]
   , "deps":
     [ ["@", "fmt", "", "fmt"]
-    , ["@", "gsl-lite", "", "gsl-lite"]
+    , ["@", "gsl", "", "gsl"]
     , ["src/buildtool/storage", "storage"]
     , ["src/buildtool/execution_api/common", "common"]
     , ["src/buildtool/execution_api/bazel_msg", "bazel_msg_factory"]
diff --git a/src/buildtool/execution_api/local/config.hpp b/src/buildtool/execution_api/local/config.hpp
index a1882776..9257b758 100644
--- a/src/buildtool/execution_api/local/config.hpp
+++ b/src/buildtool/execution_api/local/config.hpp
@@ -20,7 +20,6 @@
 #include <string>
 #include <vector>
 
-#include <gsl-lite/gsl-lite.hpp>
 #include <nlohmann/json.hpp>
 
 #include "src/buildtool/common/artifact_digest.hpp"
@@ -29,6 +28,8 @@
 #include "src/buildtool/logging/log_level.hpp"
 #include "src/buildtool/logging/logger.hpp"
 
+#include <gsl/gsl>
+
 /// \brief Store global build system configuration.
 class LocalExecutionConfig {
     struct ConfigData {
diff --git a/src/buildtool/execution_api/local/local_action.cpp b/src/buildtool/execution_api/local/local_action.cpp
index 209c6a5d..764c00aa 100644
--- a/src/buildtool/execution_api/local/local_action.cpp
+++ b/src/buildtool/execution_api/local/local_action.cpp
@@ -17,7 +17,7 @@
 #include <algorithm>
 #include <filesystem>
 
-#include "gsl-lite/gsl-lite.hpp"
+#include "gsl/gsl"
 #include "src/buildtool/common/bazel_types.hpp"
 #include "src/buildtool/compatibility/native_support.hpp"
 #include "src/buildtool/execution_api/local/config.hpp"
diff --git a/src/buildtool/execution_api/local/local_action.hpp b/src/buildtool/execution_api/local/local_action.hpp
index 4fba44ba..a49060e4 100644
--- a/src/buildtool/execution_api/local/local_action.hpp
+++ b/src/buildtool/execution_api/local/local_action.hpp
@@ -59,14 +59,14 @@ class LocalAction final : public IExecutionAction {
     std::chrono::milliseconds timeout_{kDefaultTimeout};
     CacheFlag cache_flag_{CacheFlag::CacheOutput};
 
-    LocalAction(gsl::not_null<Storage const*> storage,
+    LocalAction(gsl::not_null<Storage const*> const& storage,
                 ArtifactDigest root_digest,
                 std::vector<std::string> command,
                 std::vector<std::string> output_files,
                 std::vector<std::string> output_dirs,
                 std::map<std::string, std::string> env_vars,
                 std::map<std::string, std::string> const& properties) noexcept
-        : storage_{std::move(storage)},
+        : storage_{storage},
           root_digest_{std::move(root_digest)},
           cmdline_{std::move(command)},
           output_files_{std::move(output_files)},
diff --git a/src/buildtool/execution_api/local/local_api.hpp b/src/buildtool/execution_api/local/local_api.hpp
index c40f8471..577d771b 100644
--- a/src/buildtool/execution_api/local/local_api.hpp
+++ b/src/buildtool/execution_api/local/local_api.hpp
@@ -23,7 +23,7 @@
 #include <vector>
 
 #include "fmt/core.h"
-#include "gsl-lite/gsl-lite.hpp"
+#include "gsl/gsl"
 #include "src/buildtool/compatibility/compatibility.hpp"
 #include "src/buildtool/compatibility/native_support.hpp"
 #include "src/buildtool/execution_api/bazel_msg/bazel_blob.hpp"
diff --git a/src/buildtool/execution_api/local/local_response.hpp b/src/buildtool/execution_api/local/local_response.hpp
index 93b12009..2875ec16 100644
--- a/src/buildtool/execution_api/local/local_response.hpp
+++ b/src/buildtool/execution_api/local/local_response.hpp
@@ -105,12 +105,13 @@ class LocalResponse final : public IExecutionResponse {
     LocalAction::Output output_{};
     gsl::not_null<Storage const*> storage_;
 
-    explicit LocalResponse(std::string action_id,
-                           LocalAction::Output output,
-                           gsl::not_null<Storage const*> storage) noexcept
+    explicit LocalResponse(
+        std::string action_id,
+        LocalAction::Output output,
+        gsl::not_null<Storage const*> const& storage) noexcept
         : action_id_{std::move(action_id)},
           output_{std::move(output)},
-          storage_{std::move(storage)} {}
+          storage_{storage} {}
 };
 
 #endif  // INCLUDED_SRC_BUILDTOOL_EXECUTION_API_LOCAL_LOCAL_RESPONSE_HPP