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, 4 insertions, 2 deletions

diff --git a/Source/cmEnableLanguageCommand.h b/Source/cmEnableLanguageCommand.h
index decb788..c1c99d1 100644
--- a/Source/cmEnableLanguageCommand.h
+++ b/Source/cmEnableLanguageCommand.h
@@ -63,11 +63,13 @@ public:
   virtual const char* GetFullDocumentation()
     {
     return
-      "  ENABLE_LANGUAGE(languageName)\n"
+      "  ENABLE_LANGUAGE(languageName [OPTIONAL] )\n"
       "This command enables support for the named language in CMake. "
       "This is the same as the project command but does not create "
       "any of the extra varaibles that are created by the project command. "
-      "Example languages are CXX, C, Fortran.";
+      "Example languages are CXX, C, Fortran.\n"
+      "If OPTIONAL is used, use the CMAKE_<languageName>_COMPILER_WORKS "
+      "variable to check whether the language has been enabled successfully.";
     }
   
   cmTypeMacro(cmEnableLanguageCommand, cmCommand);