I am trying to implement a clang tool that does syntactic analysis using ASTMatcher API. I am trying to find out how to specify extra flags for clang to disable semantic checks. I know clang builds a giant AST which includes system headers. Is there any way to parse source code while disabling semantic checks which give rise to unknown type errors? I just want to analyze the syntactic integrity of the source code of the given file. So far, I have tried to get around this problem by modifying the DSL to check whether the matching code is from the main file:
cxxRecordDecl(isExpansionInMainFile()).bind("class");
But this doesn't stop clang from looking into the header files.
Unfortunately, it is impossible to use plain syntactic analysis without sema. The problem is not specifically with clang, but with all of the parsers for C++ out there. Without simultaneous semantic analysis, any syntactic analysis is ambiguous. The issue is properly covered in this answer.