CMP0022: Fix link language propagation in NEW behavior

The languages used in compiling STATIC libraries need to be propagated
to dependents regardless of the settings of INTERFACE_LINK_LIBRARIES or
CMP0022.  They are independent of the libraries in the link interface.

Prior to commit v2.8.12~192^2~2 (Introduce the INTERFACE_LINK_LIBRARIES
property, 2013-06-04) the cmTarget::ComputeLinkInterface code path for
"explicitLibraries" could never be taken for STATIC libraries, so the
logic to propagate languages existed only in the non-explicitLibraries
code path.  After that commit, INTERFACE_LINK_LIBRARIES could be set for
STATIC libraries to cause the "explicitLibraries" code path to be taken.
The commit also left the old non-explicitLibraries code path conditional
on CMP0022 not being set to NEW.  Thus link language propagation was
left missing from two cases by that commit.

The explicitLibraries code path was fixed to propagate languages by
commit v2.8.12~149^2~1 (cmTarget: Fix iface libraries and languages for
static libraries, 2013-07-26).  However, the non-explicitLibraries case
was never taught to propagate languages when CMP0022 is set to NEW.  Fix
that now.  Factor the logic to propagate link languages out of the link
interface libraries conditions so that it always occurs.  Update
Tests/Fortran to set CMP0022 to NEW to test this case (because the test
passes only if link language propagation works).

1 files changed, 7 insertions, 7 deletions

diff --git a/Source/cmTarget.cxx b/Source/cmTarget.cxx
index 3f2ae9e..a243de5 100644
--- a/Source/cmTarget.cxx
+++ b/Source/cmTarget.cxx
@@ -6481,11 +6481,6 @@ void cmTargetInternals::ComputeLinkInterface(cmTarget const* thisTarget,
               }
             }
           }
-        if(thisTarget->LinkLanguagePropagatesToDependents())
-          {
-          // Targets using this archive need its language runtime libraries.
-          iface.Languages = impl->Languages;
-          }
         }
       }
     }
@@ -6497,9 +6492,14 @@ void cmTargetInternals::ComputeLinkInterface(cmTarget const* thisTarget,
                 impl = thisTarget->GetLinkImplementation(config, headTarget);
     iface.ImplementationIsInterface = true;
     iface.WrongConfigLibraries = impl->WrongConfigLibraries;
-    if(thisTarget->LinkLanguagePropagatesToDependents())
+    }
+
+  if(thisTarget->LinkLanguagePropagatesToDependents())
+    {
+    // Targets using this archive need its language runtime libraries.
+    if(cmTarget::LinkImplementation const* impl =
+       thisTarget->GetLinkImplementation(config, headTarget))
       {
-      // Targets using this archive need its language runtime libraries.
       iface.Languages = impl->Languages;
       }
     }