cmTarget: Add a way to represent imported shared library stubs

Shared library stubs can be used for linking, but not at runtime.
Their role is similar to import libraries on Windows, so represent
their location with the `IMPORTED_IMPLIB` target property.

Fixes: #24940

1 files changed, 20 insertions, 6 deletions

diff --git a/Source/cmTarget.cxx b/Source/cmTarget.cxx
index 15f45f5..b81eec5 100644
--- a/Source/cmTarget.cxx
+++ b/Source/cmTarget.cxx
@@ -2779,6 +2779,8 @@ std::string cmTarget::ImportedGetFullPath(
       case cmStateEnums::RuntimeBinaryArtifact:
         if (loc) {
           result = *loc;
+        } else if (imp) {
+          result = *imp;
         } else {
           std::string impProp = cmStrCat("IMPORTED_LOCATION", suffix);
           if (cmValue config_location = this->GetProperty(impProp)) {
@@ -2787,6 +2789,16 @@ std::string cmTarget::ImportedGetFullPath(
                        this->GetProperty("IMPORTED_LOCATION")) {
             result = *location;
           }
+          if (result.empty() &&
+              (this->GetType() == cmStateEnums::SHARED_LIBRARY ||
+               this->IsExecutableWithExports())) {
+            impProp = cmStrCat("IMPORTED_IMPLIB", suffix);
+            if (cmValue config_implib = this->GetProperty(impProp)) {
+              result = *config_implib;
+            } else if (cmValue implib = this->GetProperty("IMPORTED_IMPLIB")) {
+              result = *implib;
+            }
+          }
         }
         break;
 
@@ -2812,7 +2824,10 @@ std::string cmTarget::ImportedGetFullPath(
         std::string unset;
         std::string configuration;
 
-        if (artifact == cmStateEnums::RuntimeBinaryArtifact) {
+        if (this->GetType() == cmStateEnums::SHARED_LIBRARY &&
+            artifact == cmStateEnums::RuntimeBinaryArtifact) {
+          unset = "IMPORTED_LOCATION or IMPORTED_IMPLIB";
+        } else if (artifact == cmStateEnums::RuntimeBinaryArtifact) {
           unset = "IMPORTED_LOCATION";
         } else if (artifact == cmStateEnums::ImportLibraryArtifact) {
           unset = "IMPORTED_IMPLIB";
@@ -2985,11 +3000,10 @@ bool cmTarget::GetMappedConfig(std::string const& desired_config, cmValue& loc,
   }
 
   // If we needed to find one of the mapped configurations but did not
-  // On a DLL platform there may be only IMPORTED_IMPLIB for a shared
-  // library or an executable with exports.
-  bool allowImp = (this->IsDLLPlatform() &&
-                   (this->GetType() == cmStateEnums::SHARED_LIBRARY ||
-                    this->IsExecutableWithExports())) ||
+  // There may be only IMPORTED_IMPLIB for a shared library or an executable
+  // with exports.
+  bool allowImp = (this->GetType() == cmStateEnums::SHARED_LIBRARY ||
+                   this->IsExecutableWithExports()) ||
     (this->IsAIX() && this->IsExecutableWithExports()) ||
     (this->GetMakefile()->PlatformSupportsAppleTextStubs() &&
      this->IsSharedLibraryWithExports());