cmExportSetMap: improve ownership of cmExportSet

- use `std::piecewise_construct` to fix gcc-4.8 build.
- can use `emplace(name, name)` gcc-6 onwards.

1 files changed, 3 insertions, 4 deletions

diff --git a/Source/cmExportInstallFileGenerator.cxx b/Source/cmExportInstallFileGenerator.cxx
index 4e3db09bdc..c5aec648eb 100644
--- a/Source/cmExportInstallFileGenerator.cxx
+++ b/Source/cmExportInstallFileGenerator.cxx
@@ -474,9 +474,8 @@ cmExportInstallFileGenerator::FindNamespaces(cmGlobalGenerator* gg,
   const cmExportSetMap& exportSets = gg->GetExportSets();
 
   for (auto const& expIt : exportSets) {
-    const cmExportSet* exportSet = expIt.second;
-    std::vector<cmTargetExport*> const* targets =
-      exportSet->GetTargetExports();
+    const cmExportSet& exportSet = expIt.second;
+    std::vector<cmTargetExport*> const* targets = exportSet.GetTargetExports();
 
     bool containsTarget = false;
     for (cmTargetExport* target : *targets) {
@@ -488,7 +487,7 @@ cmExportInstallFileGenerator::FindNamespaces(cmGlobalGenerator* gg,
 
     if (containsTarget) {
       std::vector<cmInstallExportGenerator const*> const* installs =
-        exportSet->GetInstallations();
+        exportSet.GetInstallations();
       for (cmInstallExportGenerator const* install : *installs) {
         exportFiles.push_back(install->GetDestinationFile());
         ns = install->GetNamespace();