[llvm-bugs] [Bug 30474] New: clang: assertion failure while checking format strings in libiconv

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=30474

            Bug ID: 30474
           Summary: clang: assertion failure while checking format strings
                    in libiconv
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: willdtz at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 17326
  --> https://llvm.org/bugs/attachment.cgi?id=17326&action=edit
preprocessed C source from libiconv-1.14

Assertion failure:

clang-4.0: ~/llvm/latest/include/llvm/Support/Casting.h:237: typename
llvm::cast_retty<X, Y*>::ret_type llvm::cast(Y*) [with X =
clang::UnaryOperator; Y = const clang::Expr; typename llvm::cast_retty<X,
Y*>::ret_type = const clang::UnaryOperator*]: Assertion `isa<X>(Val) &&
"cast<Ty>() argument of incompatible type!"' failed.
...
...
1.      ./iconv.c:401:42: current parser token ')'
2.      ./iconv.c:251:1: parsing function body 'check_subst_formatstring'
3.      ./iconv.c:251:1: in compound statement ('{}')


----------------

Reproducer attached, occurs with:

clang -c input.c -o input.o

Has been occurring with trunk for at least a few days, and still occurs on
trunk as of time of writing.

Let me know if you have any trouble reproducing or if there's anything more I
can do to help resolve this.

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