ENH: Add install(DIRECTORY) option 'OPTIONAL'

This adds the OPTIONAL option to the install(DIRECTORY) command.  It
tells the installation rule that it is not an error if the source
directory does not exist.  See issue #8394.

1 files changed, 3 insertions, 1 deletions

diff --git a/Source/cmInstallDirectoryGenerator.h b/Source/cmInstallDirectoryGenerator.h
index 9810d56cf1..a1166e1b2e 100644
--- a/Source/cmInstallDirectoryGenerator.h
+++ b/Source/cmInstallDirectoryGenerator.h
@@ -31,7 +31,8 @@ public:
                               const char* dir_permissions,
                               std::vector<std::string> const& configurations,
                               const char* component,
-                              const char* literal_args);
+                              const char* literal_args,
+                              bool optional = false);
   virtual ~cmInstallDirectoryGenerator();
 
 protected:
@@ -40,6 +41,7 @@ protected:
   std::string FilePermissions;
   std::string DirPermissions;
   std::string LiteralArguments;
+  bool Optional;
 };
 
 #endif