ENH: add OPTIONAL keyword to ENABLE_LANGUAGE, so it will be possible to do

something like this:

ENABLE_LANGUAGE(ASM-ATT)
IF(CMAKE_ASM-ATT_COMPILER_WORKS)
  ... do assembler stufff
ELSE(CMAKE_ASM-ATT_COMPILER_WORKS)
  ... fallback to generic C/C++
ENDIF(CMAKE_ASM-ATT_COMPILER_WORKS)

Alex

1 files changed, 17 insertions, 1 deletions

diff --git a/Source/cmEnableLanguageCommand.cxx b/Source/cmEnableLanguageCommand.cxx
index c778884..2713b62 100644
--- a/Source/cmEnableLanguageCommand.cxx
+++ b/Source/cmEnableLanguageCommand.cxx
@@ -20,13 +20,29 @@
 bool cmEnableLanguageCommand
 ::InitialPass(std::vector<std::string> const& args)
 {
+  bool optional = false;
+  std::vector<std::string> languages;
   if(args.size() < 1 )
     {
     this->SetError
       ("ENABLE_LANGUAGE called with incorrect number of arguments");
     return false;
     } 
-  this->Makefile->EnableLanguage(args);
+  for (std::vector<std::string>::const_iterator it = args.begin();
+       it != args.end();
+       ++it)
+    {
+    if ((*it) == "OPTIONAL")
+      {
+      optional = true;
+      }
+    else
+      {
+      languages.push_back(*it);
+      }
+    }
+
+  this->Makefile->EnableLanguage(languages, optional);
   return true;
 }