Optionally allow IMPORTED targets to be globally visible

Consider the case motivating commit e01cce28 (Allow add_dependencies()
on imported targets, 2010-11-19).  An imported target references a file
generated at build time by a custom target on which it depends.  Had the
file been built directly using add_library or add_executable its target
name would have been visible globally.  Therefore the imported target
representing the file should be globally visible also.

Teach the IMPORTED signature of add_(executable|library) to accept a new
"GLOBAL" option to make the imported target visible globally.

1 files changed, 14 insertions, 3 deletions

diff --git a/Source/cmGlobalGenerator.cxx b/Source/cmGlobalGenerator.cxx
index 124519a..8dce053 100644
--- a/Source/cmGlobalGenerator.cxx
+++ b/Source/cmGlobalGenerator.cxx
@@ -1666,6 +1666,11 @@ cmGlobalGenerator::FindTarget(const char* project, const char* name)
       {
       return i->second;
       }
+    i = this->ImportedTargets.find(name);
+    if ( i != this->ImportedTargets.end() )
+      {
+      return i->second;
+      }
     }
   return 0;
 }
@@ -2046,10 +2051,16 @@ cmGlobalGenerator::GetTargetDirectDepends(cmTarget & target)
   return this->TargetDependencies[&target];
 }
 
-void cmGlobalGenerator::AddTarget(cmTargets::value_type &v)
+void cmGlobalGenerator::AddTarget(cmTarget* t)
 {
-  assert(!v.second.IsImported());
-  this->TotalTargets[v.first] = &v.second;
+  if(t->IsImported())
+    {
+    this->ImportedTargets[t->GetName()] = t;
+    }
+  else
+    {
+    this->TotalTargets[t->GetName()] = t;
+    }
 }
 
 void cmGlobalGenerator::SetExternalMakefileProjectGenerator(