exports: accept a missing target if it is exported exactly once

If a target is exported, and a library it depends on is not part
of the same export set, before this patch cmake errored out.
With this patch, it now checks whether the missing target
is exported somewhere else exactly once, and accepts in this
case (because then it can determine the namespace for the
missing target and use this).

Alex

1 files changed, 2 insertions, 1 deletions

diff --git a/Source/cmExportInstallFileGenerator.h b/Source/cmExportInstallFileGenerator.h
index 77b55c8..f6f397e 100644
--- a/Source/cmExportInstallFileGenerator.h
+++ b/Source/cmExportInstallFileGenerator.h
@@ -58,7 +58,8 @@ protected:
                                            const char* config,
                                            std::string const& suffix);
   virtual void ComplainAboutMissingTarget(cmTarget* depender,
-                                          cmTarget* dependee);
+                                          cmTarget* dependee,
+                                          int occurrences);
 
   /** Generate a per-configuration file for the targets.  */
   bool GenerateImportFileConfig(const char* config);