install,export: Maybe transform OBJECT libraries to INTERFACE libraries

Teach the `install` and `export` commands to support installing and
exporting `OBJECT` libraries without their object files.  Transform
them to `INTERFACE` libraries in such cases.

For `install(TARGETS)`, activate this when no destination for the object
files is specified.  For `export`, activate this only under Xcode with
multiple architectures when we have no well-defined object file
locations to give to clients.

1 files changed, 4 insertions, 2 deletions

diff --git a/Source/cmExportFileGenerator.cxx b/Source/cmExportFileGenerator.cxx
index 434abdc..0f1d745 100644
--- a/Source/cmExportFileGenerator.cxx
+++ b/Source/cmExportFileGenerator.cxx
@@ -901,8 +901,10 @@ void cmExportFileGenerator::GenerateExpectedTargetsCode(
         "\n\n";
   /* clang-format on */
 }
+
 void cmExportFileGenerator::GenerateImportTargetCode(
-  std::ostream& os, const cmGeneratorTarget* target)
+  std::ostream& os, cmGeneratorTarget const* target,
+  cmStateEnums::TargetType targetType)
 {
   // Construct the imported target name.
   std::string targetName = this->Namespace;
@@ -911,7 +913,7 @@ void cmExportFileGenerator::GenerateImportTargetCode(
 
   // Create the imported target.
   os << "# Create imported target " << targetName << "\n";
-  switch (target->GetType()) {
+  switch (targetType) {
     case cmStateEnums::EXECUTABLE:
       os << "add_executable(" << targetName << " IMPORTED)\n";
       break;