[LLVMbugs] [Bug 19810] New: Bogus parsing derivation of enum-base from type-specifier-seq

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19810

            Bug ID: 19810
           Summary: Bogus parsing derivation of enum-base from
                    type-specifier-seq
           Product: clang
           Version: 3.4
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs at nondot.org
          Reporter: hstong at ca.ibm.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Source code which parses with C++03 fails when using Clang's implementation of
C++11.
>From the grammar in N3290, it seems an enum-base may only appear before '{' or
';'.
It looks like the Clang parser picked a production which failed and did not
backtrack.

ICC (which does understand enum-base) does not have this problem.

### SOURCE:> cat enumBaseVersusConditional.cc
enum E { E1 };
void foo() {
   false ? new enum E : int();
}
Return:  0x00:0


### COMPILER INVOCATION AND OUTPUT:> clang++ -std=c++11
enumBaseVersusConditional.cc -c
enumBaseVersusConditional.cc:3:25: error: non-integral type 'int ()' is an
invalid underlying type
   false ? new enum E : int();
                        ^
enumBaseVersusConditional.cc:3:30: error: expected ':'
   false ? new enum E : int();
                             ^
                             :
enumBaseVersusConditional.cc:3:10: note: to match this '?'
   false ? new enum E : int();
         ^
enumBaseVersusConditional.cc:3:30: error: expected expression
   false ? new enum E : int();
                             ^
3 errors generated.
Return:  0x01:1


### EXPECTED OUTPUT:> clang++ -std=c++03 enumBaseVersusConditional.cc -c
Return:  0x00:0


### VERSION INFO:> clang++ -v
clang version 3.4
Target: powerpc64-unknown-linux-gnu
Thread model: posix
Found candidate GCC installation: /usr/lib/gcc/ppc64-redhat-linux/4.4.4
Found candidate GCC installation: /usr/lib/gcc/ppc64-redhat-linux/4.4.6
Selected GCC installation: /usr/lib/gcc/ppc64-redhat-linux/4.4.6
Return:  0x00:0

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