[llvm-bugs] [Bug 33870] New: Fatal error when compiling with dataflow sanitizer (DFSan) - "fatal error: error in backend: Broken function found, compilation aborted!"

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=33870

            Bug ID: 33870
           Summary: Fatal error when compiling with dataflow sanitizer
                    (DFSan) - "fatal error: error in backend: Broken
                    function found, compilation aborted!"
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Common Code Generator Code
          Assignee: unassignedbugs at nondot.org
          Reporter: rtrieu at google.com
                CC: llvm-bugs at lists.llvm.org

$ cat blacklist.txt 
fun:snprintf=uninstrumented
fun:snprintf=custom

$ cat reduce.cpp 
extern "C" void snprintf(...);
void Foo() {
  char a[1];
  snprintf(0, a);
}

$ clang -cc1 -emit-obj -O1 -fsanitize=dataflow
-fsanitize-blacklist=dfsan_abilist.txt -x c++ reduce.cpp
Wrong types for attribute: byval inalloca nest noalias nocapture nonnull
readnone readonly sret dereferenceable(1) dereferenceable_or_null(1)
  call void (i16*, ...) @__dfsw_snprintf(i16* %3, i32 nonnull 0, i8* %0) #5
fatal error: error in backend: Broken function found, compilation aborted!

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