[llvm-bugs] [Bug 47957] New: implement -Wattribute-alias=n

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47957

            Bug ID: 47957
           Summary: implement -Wattribute-alias=n
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ndesaulniers at google.com
                CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
                    richard-llvm at metafoo.co.uk

This is helpful for catching instances when alias' are declared but types don't
match.

void test13(float y) {}
void test13_foo(int y) __attribute__((alias ("test13")));
<source>:5:6: warning: 'test13_foo' alias between functions of incompatible
types 'void(int)' and 'void(float)' [-Wattribute-alias=]

https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html
Forked from report: https://reviews.llvm.org/D66492#2350947

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