c83a834d29
During a try_compile cmGlobalGenerator::EnableLanguage uses results from the outer project. Reject attempts to enable languages in the test project that are not "ready" in the outer project. Mark a language as "ready" when all its information has been loaded and we are ready to generate build rules. This also avoids infinite recursion introduced by commit 295b5b60 (Honor CMAKE_USER_MAKE_RULES_OVERRIDE in try_compile, 2010-06-29) for projects that set CMAKE_USER_MAKE_RULES_OVERRIDE to a file that uses try_compile. The file is loaded along with the information for a given langauge so the language is not yet "ready".
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