cmTarget: Allow any generator expression in SOURCES property.

Remove use of UseObjectLibraries from Makefile and Ninja generators. It
is not needed now because those generators use GetExternalObjects
which already contains the objects from object libraries.

The VS10 generator calls both the UseObjectLibraries and the GetExternalObjects
methods. Ensure that duplicates are not created by skipping objects
from object libraries in handling of GetExternalObjects.

Similarly, fix VS6, VS7 and Xcode object handling by skipping
external objects from OBJECT_LIBRARY usage as appropriate.

The error message in the BadSourceExpression1 test is now reported
by the generator expression evaluator, so it has different text.

1 files changed, 10 insertions, 0 deletions

diff --git a/Source/cmLocalVisualStudio6Generator.cxx b/Source/cmLocalVisualStudio6Generator.cxx
index e99f3a4..11e9679 100644
--- a/Source/cmLocalVisualStudio6Generator.cxx
+++ b/Source/cmLocalVisualStudio6Generator.cxx
@@ -324,6 +324,11 @@ void cmLocalVisualStudio6Generator::WriteDSPFile(std::ostream& fout,
   for(std::vector<cmSourceFile*>::const_iterator i = classes.begin();
       i != classes.end(); i++)
     {
+    if (!(*i)->GetObjectLibrary().empty())
+      {
+      continue;
+      }
+
     // Add the file to the list of sources.
     std::string source = (*i)->GetFullPath();
     cmSourceGroup* sourceGroup =
@@ -398,6 +403,11 @@ void cmLocalVisualStudio6Generator
   for(std::vector<const cmSourceFile *>::const_iterator sf =
         sourceFiles.begin(); sf != sourceFiles.end(); ++sf)
     {
+    if (!(*sf)->GetObjectLibrary().empty())
+      {
+      continue;
+      }
+
     std::string source = (*sf)->GetFullPath();
     const cmCustomCommand *command =
       (*sf)->GetCustomCommand();