Fixes #14921: Detect enums before simplifying platform types

[autoantwort]

No description provided.

[chrchr-github]

This issue has come up multiple times before, and is not restricted to enums or the Windows library, see e.g. https://trac.cppcheck.net/ticket/12589

Contributing factors:

• We have a single configuration file for huge libraries/APIs with dozens or hundreds of headers
• The --library option is usually set per project, not per file

I don't think the proposed change is the right way to address this. Maybe -UHANDLE can be used as a workaround?

[danmar]

is it OK to redefine HANDLE in the global scope? If I compile this code:

typedef void* HANDLE;
enum {HANDLE, X};

I get such gcc errors:

1.c:3:7: error: ‘HANDLE’ redeclared as different kind of symbol

I assume windows.h defines HANDLE using a typedef?

[danmar]

I feel there is some missing scope in the example code. HANDLE in the global scope should be simplified as a void * if --library=windows has been used .. and HANDLE in your inner scope should be handled as the enum constant. We need to distinguish which type to use in different scopes..