BUG: Fixed support for external object files built by custom commands. Also added a test to keep it working.

Source/cmLocalUnixMakefileGenerator3.cxx

@@ -398,6 +398,13 @@ cmLocalUnixMakefileGenerator3
         // This is an external object file.  Just add it.
         external_objects.push_back((*source)->GetFullPath());
         }
+      else
+        {
+        // We only get here if a source file is not an external object
+        // and has an extension that is listed as an ignored file type
+        // for this language.  No message or diagnosis should be
+        // given.
+        }
       }
     }
   
@@ -1283,6 +1290,14 @@ cmLocalUnixMakefileGenerator3
   // Add a dependency on the rule file itself.
   this->AppendRuleDepend(depends, ruleFileName);
 
+  for(std::vector<std::string>::const_iterator obj = external_objects.begin();
+      obj != external_objects.end(); ++obj)
+    {
+    depends.push_back(*obj);
+    }
+
+  // from here up is the same for exe or lib
+
   // Get the name of the executable to generate.
   std::string targetName;
   std::string targetNameReal;
@@ -1602,14 +1617,14 @@ cmLocalUnixMakefileGenerator3
   // Add a dependency on the rule file itself.
   this->AppendRuleDepend(depends, ruleFileName);
 
-  // from here up is the same for exe or lib
-
   for(std::vector<std::string>::const_iterator obj = external_objects.begin();
       obj != external_objects.end(); ++obj)
     {
     depends.push_back(*obj);
     }
 
+  // from here up is the same for exe or lib
+
   // Get the language to use for linking this library.
   const char* linkLanguage =
     target.GetLinkerLanguage(this->GetGlobalGenerator());

Source/cmSourceFile.cxx

@@ -70,6 +70,10 @@ void cmSourceFile::SetName(const char* name, const char* dir,
       this->SetProperty("HEADER_FILE_ONLY","0");
       }
     m_FullPath = hname;
+
+    // Mark this as an external object file if it has the proper
+    // extension.  THIS CODE IS DUPLICATED IN THE OTHER SetName METHOD.
+    // THESE METHODS SHOULD BE MERGED.
     if ( m_SourceExtension == "obj" || m_SourceExtension == "o" ||
       m_SourceExtension == "lo" )
       {
@@ -141,6 +145,15 @@ void cmSourceFile::SetName(const char* name, const char* dir, const char *ext,
   m_FullPath = cmSystemTools::CollapseFullPath(fname.c_str(), dir);
   cmSystemTools::ConvertToUnixSlashes(m_FullPath);
   m_SourceExtension = ext;
+
+  // Mark this as an external object file if it has the proper
+  // extension.  THIS CODE IS DUPLICATED IN THE OTHER SetName METHOD.
+  // THESE METHODS SHOULD BE MERGED.
+  if ( m_SourceExtension == "obj" || m_SourceExtension == "o" ||
+       m_SourceExtension == "lo" )
+    {
+    this->SetProperty("EXTERNAL_OBJECT", "1");
+    }
   return;
 }
 

Tests/ExternalOBJ/CMakeLists.txt

@@ -41,5 +41,14 @@ ELSE(EXTERNAL_OBJECT)
   MESSAGE(FATAL_ERROR "Could not find ${EXTERNAL_OBJECT_NAME}.")
 ENDIF(EXTERNAL_OBJECT)
 
+# Test creation of external objects by custom commands.
+SET(CUSTOM_OBJECT
+  ${CMAKE_CURRENT_BINARY_DIR}/custom_object${CMAKE_C_OUTPUT_EXTENSION})
+ADD_CUSTOM_COMMAND(
+  OUTPUT ${CUSTOM_OBJECT}
+  COMMAND ${CMAKE_COMMAND} -E copy ${EXTERNAL_OBJECT} ${CUSTOM_OBJECT}
+  DEPENDS ${EXTERNAL_OBJECT}
+  )
+
 # Build an executable using the external object file.
-ADD_EXECUTABLE(executable executable.cxx ${EXTERNAL_OBJECT})
+ADD_EXECUTABLE(executable executable.cxx ${CUSTOM_OBJECT})