[llvm-bugs] [Bug 33569] New: c++ filt unable to demangle enable_if attributes

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=33569

            Bug ID: 33569
           Summary: c++ filt unable to demangle enable_if attributes
           Product: new-bugs
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: dmaclach at gmail.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 18697
  --> https://bugs.llvm.org/attachment.cgi?id=18697&action=edit
source code to generate symbol that can't be demangled

__attribute__ ((__enable_if__(true, ""))) int foo() {
  return 0;
}

int main()
{
  return foo();
}

Compiling with

Apple LLVM version 8.1.0 (clang-802.0.42)
Target: x86_64-apple-darwin16.6.0
Thread model: posix

generates a symbol of

_Z3fooUa9enable_ifIXLb1EEEv

for foo

which neither c++filt nor abi::__cxa_demangle can demangle.

These symbols are extremely common now in the C++ headers due to heavy use of
enable_if

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