From f3ad061858d03cc2a0569f903df3560152106050 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Wed, 12 Jan 2022 17:14:40 -0500
Subject: Add usage requirements to update direct link dependencies

Link line construction starts with `LINK_LIBRARIES` and appends
dependencies from the transitive closure of `INTERFACE_LINK_LIBRARIES`.
Only the entries of `LINK_LIBRARIES` are considered direct link
dependencies.  In some advanced use cases, particularly involving static
libraries and static plugins, usage requirements need to update the list
of direct link dependencies.  This may mean adding new items, removing
existing items, or both.

Add target properties to encode these usage requirements:

* INTERFACE_LINK_LIBRARIES_DIRECT
* INTERFACE_LINK_LIBRARIES_DIRECT_EXCLUDE

Fixes: #22496
---
 Source/cmExportFileGenerator.cxx | 27 +++++++++++++++++----------
 1 file changed, 17 insertions(+), 10 deletions(-)

(limited to 'Source/cmExportFileGenerator.cxx')

diff --git a/Source/cmExportFileGenerator.cxx b/Source/cmExportFileGenerator.cxx
index 896240cad7..412d1040fd 100644
--- a/Source/cmExportFileGenerator.cxx
+++ b/Source/cmExportFileGenerator.cxx
@@ -2,6 +2,7 @@
    file Copyright.txt or https://cmake.org/licensing for details.  */
 #include "cmExportFileGenerator.h"
 
+#include <array>
 #include <cassert>
 #include <cstring>
 #include <sstream>
@@ -175,18 +176,24 @@ bool cmExportFileGenerator::PopulateInterfaceLinkLibrariesProperty(
   if (!target->IsLinkable()) {
     return false;
   }
-  cmValue input = target->GetProperty("INTERFACE_LINK_LIBRARIES");
-  if (input) {
-    std::string prepro =
-      cmGeneratorExpression::Preprocess(*input, preprocessRule);
-    if (!prepro.empty()) {
-      this->ResolveTargetsInGeneratorExpressions(
-        prepro, target, missingTargets, ReplaceFreeTargets);
-      properties["INTERFACE_LINK_LIBRARIES"] = prepro;
-      return true;
+  static const std::array<std::string, 3> linkIfaceProps = {
+    { "INTERFACE_LINK_LIBRARIES", "INTERFACE_LINK_LIBRARIES_DIRECT",
+      "INTERFACE_LINK_LIBRARIES_DIRECT_EXCLUDE" }
+  };
+  bool hadINTERFACE_LINK_LIBRARIES = false;
+  for (std::string const& linkIfaceProp : linkIfaceProps) {
+    if (cmValue input = target->GetProperty(linkIfaceProp)) {
+      std::string prepro =
+        cmGeneratorExpression::Preprocess(*input, preprocessRule);
+      if (!prepro.empty()) {
+        this->ResolveTargetsInGeneratorExpressions(
+          prepro, target, missingTargets, ReplaceFreeTargets);
+        properties[linkIfaceProp] = prepro;
+        hadINTERFACE_LINK_LIBRARIES = true;
+      }
     }
   }
-  return false;
+  return hadINTERFACE_LINK_LIBRARIES;
 }
 
 static bool isSubDirectory(std::string const& a, std::string const& b)
-- 
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