llvm dev - Jul 2010 - [LLVMdev] Operation on argument of 2d array of templated class can NOT pass llvm-gcc

for example:

template <int N>
class T {
public:
  int V;
};

T<4> test(T<4> a[4][8]) {
  return a[3][3];
}


in LLVM23 release, it will crash llvm-gcc,

test.cpp: In function \u2018T<4> test(T<4> (*)[8])\u2019:
test.cpp:7: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://llvm.org/bugs/> for instructions.


in TOT llvm-gcc (r108122)

it can NOT pass syntax check:

test.cpp: In function '8T<4> test(T<4> (*)[8])':
test.cpp:7: error: invalid use of incomplete type 'class T<4>'
test.cpp:2: error: declaration of 'class T<4>'


Who can help explain the reason? How can we get around the issue?

Thanks.
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As some extra data points, gcc-4.5, gcc-4.2 and clang all accept this code.
> for example:
>
> template<int N>
> class T {
> public:
>    int V;
> };
>
> T<4>  test(T<4>  a[4][8]) {
>    return a[3][3];
> }
>
>
> in LLVM23 release, it will crash llvm-gcc,
>
> test.cpp: In function \u2018T<4>  test(T<4>  (*)[8])\u2019:
> test.cpp:7: internal compiler error: Segmentation fault
> Please submit a full bug report,
> with preprocessed source if appropriate.
> See<URL:http://llvm.org/bugs/>  for instructions.
>
>
> in TOT llvm-gcc (r108122)
>
> it can NOT pass syntax check:
>
> test.cpp: In function'8T<4>  test(T<4>  (*)[8])':
> test.cpp:7: error: invalid use of incomplete type'class T<4>'
> test.cpp:2: error: declaration of'class T<4>'
>
>
> Who can help explain the reason? How can we get around the issue?
>
> Thanks.
>
>
>
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