[llvm-bugs] [Bug 30643] New: libc++experimental built w/ UBSAN has undefined references to __muloti4 builtin

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=30643

            Bug ID: 30643
           Summary: libc++experimental built w/ UBSAN has undefined
                    references to __muloti4 builtin
           Product: libc++
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: eric at efcs.ca
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com
    Classification: Unclassified

For some reason the typical GNU libraries don't provide this builtin, but
libclang_rt.builtins-x86_64.a does. This means that the user must manually link
the libclang builtins to get UBSAN to work.

The missing builtin is required when doing 128-bit integer multiplication in
filesystem.

I'm filing this bug as a reminder to fix this.

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