On (recent?) Macs, CPP needs to be invoked as "cpp -xc++"

Hello everyone,

We are currently building a fuzzer for binary formats on top of py010parser.

On my Mac (MacOS 10.15.6), py010parser fails, reporting a syntax error as soon as the first '//' comment is parsed in the .bt file.

This is because on my Mac, "cpp" (/usr/bin/cpp) by default does not strip comments. One needs to invoke it as "cpp -xstdc++".

I can work around this by setting cpp_args="-xstdc++" for parsing, but you may wish to set up the default for cpp_args accordingly.

Cheers,

Andreas

Start by tracing how py010parser invokes the C preprocessor and where the default cpp_args value is set. Reproduce the reported failure on macOS, verify the appropriate preprocessor argument, and confirm that parsing .bt files with // comments succeeds without requiring a caller-supplied cpp_args override.

Written by the indexing model from the issue text.