[LLVMbugs] [Bug 18939] New: Concatenated Objective C format string triggers Sema::CheckFormatString "String literal not of constant array type!" assert

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18939

            Bug ID: 18939
           Summary: Concatenated Objective C format string triggers
                    Sema::CheckFormatString "String literal not of
                    constant array type!" assert
           Product: clang
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: stephan.bergmann.secondary at googlemail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

At least on recent trunk incl. r201795 "Sema: Emit a warning for non-null
terminated format strings and other pathological cases," compiling the
Objective C code

  #import <Foundation/NSString.h>
  void test(void) { [NSString stringWithFormat: @"" @""]; }

via "clang -c test.m" fails with

  Assertion failed: (T && "String literal not of constant array type!"),
function CheckFormatString, file .../tools/clang/lib/Sema/SemaChecking.cpp,
line 3533.

Appears that such a concatenation of Objective C string literals is not of
ConstantArrayType.

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