OpenWatcom: Add infrastructure to link to object files

Modules/Compiler/OpenWatcom.cmake

@@ -7,6 +7,7 @@ include_guard()
 set(CMAKE_LIBRARY_PATH_FLAG "libpath ")
 set(CMAKE_LINK_LIBRARY_FLAG "library ")
 set(CMAKE_LINK_LIBRARY_FILE_FLAG "library ")
+set(CMAKE_LINK_OBJECT_FILE_FLAG "file ")
 
 if(CMAKE_VERBOSE_MAKEFILE)
   set(CMAKE_WCL_QUIET)

Source/cmComputeLinkDepends.h

@@ -42,6 +42,7 @@ public:
     cmGeneratorTarget const* Target = nullptr;
     bool IsSharedDep = false;
     bool IsFlag = false;
+    bool IsObject = false;
   };
 
   using EntryVector = std::vector<LinkEntry>;

Source/cmComputeLinkInformation.cxx

@@ -309,6 +309,13 @@ cmComputeLinkInformation::cmComputeLinkInformation(
     this->LibLinkSuffix =
       this->Makefile->GetSafeDefinition("CMAKE_LINK_LIBRARY_SUFFIX");
   }
+  if (cmProp flag = this->Makefile->GetDefinition(
+        "CMAKE_" + this->LinkLanguage + "_LINK_OBJECT_FILE_FLAG")) {
+    this->ObjLinkFileFlag = *flag;
+  } else {
+    this->ObjLinkFileFlag =
+      this->Makefile->GetSafeDefinition("CMAKE_LINK_OBJECT_FILE_FLAG");
+  }
 
   // Get options needed to specify RPATHs.
   this->RuntimeUseChrpath = false;
@@ -514,7 +521,8 @@ bool cmComputeLinkInformation::Compute()
     if (linkEntry.IsSharedDep) {
       this->AddSharedDepItem(linkEntry.Item, linkEntry.Target);
     } else {
-      this->AddItem(linkEntry.Item, linkEntry.Target);
+      this->AddItem(linkEntry.Item, linkEntry.Target,
+                    linkEntry.IsObject ? ItemIsObject::Yes : ItemIsObject::No);
     }
   }
 
@@ -634,7 +642,8 @@ void cmComputeLinkInformation::AddImplicitLinkInfo(std::string const& lang)
 }
 
 void cmComputeLinkInformation::AddItem(BT<std::string> const& item,
-                                       cmGeneratorTarget const* tgt)
+                                       cmGeneratorTarget const* tgt,
+                                       ItemIsObject isObject)
 {
   // Compute the proper name to use to link this library.
   const std::string& config = this->Config;
@@ -660,13 +669,14 @@ void cmComputeLinkInformation::AddItem(BT<std::string> const& item,
       std::string exe = tgt->GetFullPath(config, artifact, true);
       linkItem += exe;
       this->Items.emplace_back(BT<std::string>(linkItem, item.Backtrace),
-                               ItemIsPath::Yes, tgt);
+                               ItemIsPath::Yes, ItemIsObject::No, tgt);
       this->Depends.push_back(std::move(exe));
     } else if (tgt->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
       // Add the interface library as an item so it can be considered as part
       // of COMPATIBLE_INTERFACE_ enforcement.  The generators will ignore
       // this for the actual link line.
-      this->Items.emplace_back(std::string(), ItemIsPath::No, tgt);
+      this->Items.emplace_back(std::string(), ItemIsPath::No, ItemIsObject::No,
+                               tgt);
 
       // Also add the item the interface specifies to be used in its place.
       std::string const& libName = tgt->GetImportedLibName(config);
@@ -719,7 +729,7 @@ void cmComputeLinkInformation::AddItem(BT<std::string> const& item,
       } else {
         // Use the full path given to the library file.
         this->Depends.push_back(item.Value);
-        this->AddFullItem(item);
+        this->AddFullItem(item, isObject);
         this->AddLibraryRuntimeInfo(item.Value);
       }
     } else {
@@ -1084,10 +1094,11 @@ void cmComputeLinkInformation::AddTargetItem(BT<std::string> const& item,
   }
 
   // Now add the full path to the library.
-  this->Items.emplace_back(item, ItemIsPath::Yes, target);
+  this->Items.emplace_back(item, ItemIsPath::Yes, ItemIsObject::No, target);
 }
 
-void cmComputeLinkInformation::AddFullItem(BT<std::string> const& item)
+void cmComputeLinkInformation::AddFullItem(BT<std::string> const& item,
+                                           ItemIsObject isObject)
 {
   // Check for the implicit link directory special case.
   if (this->CheckImplicitDirItem(item.Value)) {
@@ -1138,7 +1149,7 @@ void cmComputeLinkInformation::AddFullItem(BT<std::string> const& item)
   }
 
   // Now add the full path to the library.
-  this->Items.emplace_back(item, ItemIsPath::Yes);
+  this->Items.emplace_back(item, ItemIsPath::Yes, isObject);
 }
 
 bool cmComputeLinkInformation::CheckImplicitDirItem(std::string const& item)

Source/cmComputeLinkInformation.h

@@ -41,18 +41,27 @@ public:
     Yes,
   };
 
+  enum class ItemIsObject
+  {
+    No,
+    Yes,
+  };
+
   struct Item
   {
     Item() = default;
     Item(BT<std::string> v, ItemIsPath isPath,
+         ItemIsObject isObject = ItemIsObject::No,
          cmGeneratorTarget const* target = nullptr)
       : Value(std::move(v))
       , IsPath(isPath)
+      , IsObject(isObject)
       , Target(target)
     {
     }
     BT<std::string> Value;
     ItemIsPath IsPath = ItemIsPath::Yes;
+    ItemIsObject IsObject = ItemIsObject::No;
     cmGeneratorTarget const* Target = nullptr;
   };
   using ItemVector = std::vector<Item>;
@@ -81,6 +90,11 @@ public:
     return this->LibLinkFileFlag;
   }
 
+  std::string const& GetObjLinkFileFlag() const
+  {
+    return this->ObjLinkFileFlag;
+  }
+
   std::string const& GetRPathLinkFlag() const { return this->RPathLinkFlag; }
   std::string GetRPathLinkString() const;
 
@@ -89,7 +103,8 @@ public:
   const cmGeneratorTarget* GetTarget() { return this->Target; }
 
 private:
-  void AddItem(BT<std::string> const& item, const cmGeneratorTarget* tgt);
+  void AddItem(BT<std::string> const& item, const cmGeneratorTarget* tgt,
+               ItemIsObject isObject = ItemIsObject::No);
   void AddSharedDepItem(BT<std::string> const& item,
                         cmGeneratorTarget const* tgt);
   void AddRuntimeDLL(cmGeneratorTarget const* tgt);
@@ -125,6 +140,7 @@ private:
   const char* LoaderFlag;
   std::string LibLinkFlag;
   std::string LibLinkFileFlag;
+  std::string ObjLinkFileFlag;
   std::string LibLinkSuffix;
   std::string RuntimeFlag;
   std::string RuntimeSep;
@@ -166,7 +182,7 @@ private:
   // Handling of link items.
   void AddTargetItem(BT<std::string> const& item,
                      const cmGeneratorTarget* target);
-  void AddFullItem(BT<std::string> const& item);
+  void AddFullItem(BT<std::string> const& item, ItemIsObject isObject);
   bool CheckImplicitDirItem(std::string const& item);
   void AddUserItem(BT<std::string> const& item, bool pathNotKnown);
   void AddFrameworkItem(std::string const& item);

Source/cmLinkLineComputer.cxx

@@ -75,7 +75,11 @@ void cmLinkLineComputer::ComputeLinkLibs(
 
     BT<std::string> linkLib;
     if (item.IsPath == cmComputeLinkInformation::ItemIsPath::Yes) {
-      linkLib.Value += cli.GetLibLinkFileFlag();
+      if (item.IsObject == cmComputeLinkInformation::ItemIsObject::Yes) {
+        linkLib.Value += cli.GetObjLinkFileFlag();
+      } else {
+        linkLib.Value += cli.GetLibLinkFileFlag();
+      }
       linkLib.Value += this->ConvertToOutputFormat(
         this->ConvertToLinkReference(item.Value.Value));
       linkLib.Backtrace = item.Value.Backtrace;