LINK_DIRECTORIES target property: add policy for absolute paths check.

1 files changed, 26 insertions, 2 deletions

diff --git a/Source/cmGeneratorTarget.cxx b/Source/cmGeneratorTarget.cxx
index 012d77a..29c6058 100644
--- a/Source/cmGeneratorTarget.cxx
+++ b/Source/cmGeneratorTarget.cxx
@@ -3091,14 +3091,38 @@ void processLinkDirectories(
     for (std::string& entryDirectory : entryDirectories) {
       if (!cmSystemTools::FileIsFullPath(entryDirectory)) {
         std::ostringstream e;
+        bool noMessage = false;
+        cmake::MessageType messageType = cmake::FATAL_ERROR;
         if (!targetName.empty()) {
           /* clang-format off */
           e << "Target \"" << targetName << "\" contains relative "
             "path in its INTERFACE_LINK_DIRECTORIES:\n"
             "  \"" << entryDirectory << "\"";
           /* clang-format on */
-          tgt->GetLocalGenerator()->IssueMessage(cmake::FATAL_ERROR, e.str());
-          return;
+        } else {
+          switch (tgt->GetPolicyStatusCMP0081()) {
+            case cmPolicies::WARN: {
+              e << cmPolicies::GetPolicyWarning(cmPolicies::CMP0081) << "\n";
+              messageType = cmake::AUTHOR_WARNING;
+            } break;
+            case cmPolicies::OLD:
+              noMessage = true;
+              break;
+            case cmPolicies::REQUIRED_IF_USED:
+            case cmPolicies::REQUIRED_ALWAYS:
+            case cmPolicies::NEW:
+              // Issue the fatal message.
+              break;
+          }
+          e << "Found relative path while evaluating link directories of "
+               "\""
+            << tgt->GetName() << "\":\n  \"" << entryDirectory << "\"\n";
+        }
+        if (!noMessage) {
+          tgt->GetLocalGenerator()->IssueMessage(messageType, e.str());
+          if (messageType == cmake::FATAL_ERROR) {
+            return;
+          }
         }
       }