Construct a source file (just like 'try_cpp()'), run it through the preprocessor, and return true if any line of the output matches 'pattern'. 'pattern' should either be a compiled regex object or a string containing a regex. If both 'body' and 'headers' are None, p
(self, pattern, body=None, headers=None, include_dirs=None,
lang="c")
source not stored for this graph (policy: none)