[llvm-bugs] [Bug 32692] New: [UBSAN] Call to function (unknown) through pointer to incorrect function type

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=32692

            Bug ID: 32692
           Summary: [UBSAN] Call to function (unknown) through pointer to
                    incorrect function type
           Product: new-bugs
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: ernest.galix at gmail.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 18297
  --> https://bugs.llvm.org/attachment.cgi?id=18297&action=edit
Source code

I have a program that dynamically links against a library.
The program passes a function pointer to that library, to execute.

But the ubsan (Undefined Behavior Sanitizer) specified that the pointer is on
an incorrect function type. And that occurs only 

 - if the callback function has a class as parameter
 - if the callback function has a class as parameter, but only forward declared
 - if I specify the compilation flags: -fvisibility=hidden.

I use clang to compile my project.

The attached code is reduced to a simple test case. Check the comments to see
where we can act to remove some warnings. But these fixes seem obvious.

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