[llvm-bugs] [Bug 48489] New: __builtin___clear_cache() has a different prototype than GCC

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48489

            Bug ID: 48489
           Summary: __builtin___clear_cache() has a different prototype
                    than GCC
           Product: clang
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C
          Assignee: unassignedclangbugs at nondot.org
          Reporter: alx.manpages at gmail.com
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

GCC provides:

void __builtin___clear_cache(void *begin, void *end);

See: https://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html

Clang provides:

void __builtin___clear_cache(char *begin, char *end);

I think GCC used char *' in the past, and moved to 'void *', but I'm not sure
about this.  Please, use the same prototype that GCC uses, for compatibility
reasons.

I don't know much about internals of Clang/LLVM, but the only source I could
find that defines the types for the prototype is:
https://github.com/llvm/llvm-project/blob/7faf62a80bfc3a9dfe34133681fcc31f8e8d658b/clang/include/clang/Basic/Builtins.def#L583

If you can confirm that, or tell me which other sources need to be modified,
I'll be happy to submit a patch.

And a reminder to myself when this bug is closed:  Update cacheflush(2) manual
page.

Related linux-man@ thread:
https://lore.kernel.org/linux-man/747d56e0-c102-ab40-add4-530a48a43a4d@gmx.de/T/#t

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