cmTarget: Record backtraces for INTERFACE_LINK_LIBRARIES

Source/cmExportTryCompileFileGenerator.cxx

@@ -107,10 +107,16 @@ void cmExportTryCompileFileGenerator::PopulateProperties(
   const cmGeneratorTarget* target, ImportPropertyMap& properties,
   std::set<cmGeneratorTarget const*>& emitted)
 {
+  // Look through all non-special properties.
   std::vector<std::string> props = target->GetPropertyKeys();
+  // Include special properties that might be relevant here.
+  props.emplace_back("INTERFACE_LINK_LIBRARIES");
   for (std::string const& p : props) {
-
-    properties[p] = *target->GetProperty(p);
+    cmValue v = target->GetProperty(p);
+    if (!v) {
+      continue;
+    }
+    properties[p] = *v;
 
     if (cmHasLiteralPrefix(p, "IMPORTED_LINK_INTERFACE_LIBRARIES") ||
         cmHasLiteralPrefix(p, "IMPORTED_LINK_DEPENDENT_LIBRARIES") ||

Source/cmTarget.cxx

@@ -200,6 +200,7 @@ public:
   std::vector<BT<std::string>> LinkOptionsEntries;
   std::vector<BT<std::string>> LinkDirectoriesEntries;
   std::vector<BT<std::string>> LinkImplementationPropertyEntries;
+  std::vector<BT<std::string>> LinkInterfacePropertyEntries;
   std::vector<BT<std::string>> HeaderSetsEntries;
   std::vector<BT<std::string>> InterfaceHeaderSetsEntries;
   std::vector<std::pair<cmTarget::TLLSignature, cmListFileContext>>
@@ -1114,6 +1115,11 @@ cmBTStringRange cmTarget::GetLinkImplementationEntries() const
   return cmMakeRange(this->impl->LinkImplementationPropertyEntries);
 }
 
+cmBTStringRange cmTarget::GetLinkInterfaceEntries() const
+{
+  return cmMakeRange(this->impl->LinkInterfacePropertyEntries);
+}
+
 cmBTStringRange cmTarget::GetHeaderSetsEntries() const
 {
   return cmMakeRange(this->impl->HeaderSetsEntries);
@@ -1157,6 +1163,7 @@ MAKE_PROP(HEADER_DIRS);
 MAKE_PROP(HEADER_SET);
 MAKE_PROP(HEADER_SETS);
 MAKE_PROP(INTERFACE_HEADER_SETS);
+MAKE_PROP(INTERFACE_LINK_LIBRARIES);
 #undef MAKE_PROP
 }
 
@@ -1282,6 +1289,12 @@ void cmTarget::StoreProperty(const std::string& prop, ValueType value)
       cmListFileBacktrace lfbt = this->impl->Makefile->GetBacktrace();
       this->impl->LinkImplementationPropertyEntries.emplace_back(value, lfbt);
     }
+  } else if (prop == propINTERFACE_LINK_LIBRARIES) {
+    this->impl->LinkInterfacePropertyEntries.clear();
+    if (value) {
+      cmListFileBacktrace lfbt = this->impl->Makefile->GetBacktrace();
+      this->impl->LinkInterfacePropertyEntries.emplace_back(value, lfbt);
+    }
   } else if (prop == propSOURCES) {
     this->impl->SourceEntries.clear();
     if (value) {
@@ -1535,6 +1548,11 @@ void cmTarget::AppendProperty(const std::string& prop,
       cmListFileBacktrace lfbt = this->impl->Makefile->GetBacktrace();
       this->impl->LinkImplementationPropertyEntries.emplace_back(value, lfbt);
     }
+  } else if (prop == propINTERFACE_LINK_LIBRARIES) {
+    if (!value.empty()) {
+      cmListFileBacktrace lfbt = this->impl->Makefile->GetBacktrace();
+      this->impl->LinkInterfacePropertyEntries.emplace_back(value, lfbt);
+    }
   } else if (prop == "SOURCES") {
     cmListFileBacktrace lfbt = this->impl->Makefile->GetBacktrace();
     this->impl->SourceEntries.emplace_back(value, lfbt);
@@ -1844,6 +1862,7 @@ cmValue cmTarget::GetProperty(const std::string& prop) const
     propHEADER_SET,
     propHEADER_SETS,
     propINTERFACE_HEADER_SETS,
+    propINTERFACE_LINK_LIBRARIES,
   };
   if (specialProps.count(prop)) {
     if (prop == propC_STANDARD || prop == propCXX_STANDARD ||
@@ -1864,6 +1883,15 @@ cmValue cmTarget::GetProperty(const std::string& prop) const
       output = cmJoin(this->impl->LinkImplementationPropertyEntries, ";");
       return cmValue(output);
     }
+    if (prop == propINTERFACE_LINK_LIBRARIES) {
+      if (this->impl->LinkInterfacePropertyEntries.empty()) {
+        return nullptr;
+      }
+
+      static std::string output;
+      output = cmJoin(this->impl->LinkInterfacePropertyEntries, ";");
+      return cmValue(output);
+    }
     // the type property returns what type the target is
     if (prop == propTYPE) {
       return cmValue(cmState::GetTargetTypeName(this->GetType()));

Source/cmTarget.h

@@ -265,6 +265,8 @@ public:
 
   cmBTStringRange GetLinkImplementationEntries() const;
 
+  cmBTStringRange GetLinkInterfaceEntries() const;
+
   cmBTStringRange GetHeaderSetsEntries() const;
 
   cmBTStringRange GetInterfaceHeaderSetsEntries() const;