Propagate backtraces from LINK_LIBRARIES through to link line items

Since commit d4d0dd0f6a (cmLinkLineComputer: Add ComputeLinkLibs
overload with backtraces, 2019-09-13, v3.16.0-rc1~87^2~4), backtraces
have been collected by `ComputeLinkLibs` by looking back through the
link implementation libraries for one matching the text of the link line
item.  This is slow in projects with long link lines.

Instead, teach `cmComputeLinkDepends` and `cmComputeLinkInformation` to
carry backtrace information explicitly along with the text of each item.

Fixes: #20322

1 files changed, 2 insertions, 2 deletions

diff --git a/Source/cmLocalVisualStudio7Generator.cxx b/Source/cmLocalVisualStudio7Generator.cxx
index f19549d7bc..e771a4abab 100644
--- a/Source/cmLocalVisualStudio7Generator.cxx
+++ b/Source/cmLocalVisualStudio7Generator.cxx
@@ -1256,11 +1256,11 @@ void cmLocalVisualStudio7GeneratorInternals::OutputLibraries(
   for (auto const& lib : libs) {
     if (lib.IsPath) {
       std::string rel =
-        lg->MaybeConvertToRelativePath(currentBinDir, lib.Value.c_str());
+        lg->MaybeConvertToRelativePath(currentBinDir, lib.Value.Value.c_str());
       fout << lg->ConvertToXMLOutputPath(rel.c_str()) << " ";
     } else if (!lib.Target ||
                lib.Target->GetType() != cmStateEnums::INTERFACE_LIBRARY) {
-      fout << lib.Value << " ";
+      fout << lib.Value.Value << " ";
     }
   }
 }