Export: Populate INTERFACE_COMPILE_FEATURES property.

Source/cmExportBuildFileGenerator.cxx

@@ -85,6 +85,9 @@ bool cmExportBuildFileGenerator::GenerateMainFile(std::ostream& os)
     this->PopulateInterfaceProperty("INTERFACE_AUTOUIC_OPTIONS", te,
                                     cmGeneratorExpression::BuildInterface,
                                     properties, missingTargets);
+    this->PopulateInterfaceProperty("INTERFACE_COMPILE_FEATURES", te,
+                                    cmGeneratorExpression::BuildInterface,
+                                    properties, missingTargets);
     this->PopulateInterfaceProperty("INTERFACE_POSITION_INDEPENDENT_CODE",
                                   te, properties);
     const bool newCMP0022Behavior =

Source/cmExportInstallFileGenerator.cxx

@@ -149,6 +149,10 @@ bool cmExportInstallFileGenerator::GenerateMainFile(std::ostream& os)
                                   te,
                                   cmGeneratorExpression::InstallInterface,
                                   properties, missingTargets);
+    this->PopulateInterfaceProperty("INTERFACE_COMPILE_FEATURES",
+                                  te,
+                                  cmGeneratorExpression::InstallInterface,
+                                  properties, missingTargets);
 
     const bool newCMP0022Behavior =
                               te->GetPolicyStatusCMP0022() != cmPolicies::WARN

Tests/ExportImport/Export/Interface/CMakeLists.txt

@@ -23,7 +23,10 @@ set_property(TARGET sharedlib PROPERTY INTERFACE_COMPILE_DEFINITIONS "SHAREDLIB_
 add_library(sharediface INTERFACE)
 target_link_libraries(sharediface INTERFACE sharedlib)
 
-install(TARGETS headeronly sharediface
+add_library(use_auto_type INTERFACE)
+target_compile_features(use_auto_type INTERFACE cxx_auto_type)
+
+install(TARGETS headeronly sharediface use_auto_type
   EXPORT expInterface
 )
 install(TARGETS sharedlib

Tests/ExportImport/Import/CMakeLists.txt

 cmake_minimum_required (VERSION 2.7.20090711)
+cmake_policy(SET CMP0025 NEW)
 project(Import C CXX)
 
 # Import everything in a subdirectory.

Tests/ExportImport/Import/Interface/CMakeLists.txt

@@ -40,6 +40,23 @@ macro(do_try_compile prefix)
   if(NOT ${prefix}IFACE_TRY_COMPILE)
     message(SEND_ERROR "${prefix} try_compile with IMPORTED INTERFACE target failed!\n\n${OUTPUT}")
   endif()
+
+  if (";${CMAKE_CXX_COMPILE_FEATURES};" MATCHES ";cxx_auto_type;")
+    set(CMAKE_REQUIRED_LIBRARIES ${prefix}::use_auto_type)
+    check_cxx_source_compiles(
+      "
+    int main(int,char**)
+    {
+      auto value = 0;
+      return value;
+    }
+    " ${prefix}IMPORTED_IFACE_CONSTEXPR)
+
+    if(NOT ${prefix}IMPORTED_IFACE_CONSTEXPR)
+      message(SEND_ERROR "${prefix} try_compile with IMPORTED INTERFACE target failed!\n\n${OUTPUT}")
+    endif()
+  endif()
+
 endmacro()
 
 do_try_compile(bld)