[Bug 479504] [NEW] internal compiler error: offsetof within class template definition

[Roger Pate]

Public bug reported:

Binary package hint: gcc-4.3

The simple test case, gcc-ice-bare.cpp, is below.  It should generate an
error (A is undefined at that point), but not an ICE!  Other variations
are in gcc-ice.cpp.

$ cat gcc-ice-bare.cpp
template<class T>
struct A {
    int d;
    char a[__builtin_offsetof(A, d)];
};
int main() {
    A<int> l;
}

$ g++ gcc-ice-bare.cpp
gcc-ice-bare.cpp: In instantiation of ‘A<int>’:
gcc-ice-bare.cpp:7:   instantiated from here
gcc-ice-bare.cpp:4: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-4.3/README.Bugs> for instructions.

$ g++ -v
Using built-in specs.
Target: i486-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.3.3-5ubuntu4' --with-bugurl=file:///usr/share/doc/gcc-4.3/README.Bugs --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --enable-shared --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --enable-nls --with-gxx-include-dir=/usr/include/c++/4.3 --program-suffix=-4.3 --enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc --enable-mpfr --enable-targets=all --with-tune=generic --enable-checking=release --build=i486-linux-gnu --host=i486-linux-gnu --target=i486-linux-gnu
Thread model: posix
gcc version 4.3.3 (Ubuntu 4.3.3-5ubuntu4) 

$ cat gcc-ice.cpp
#include <cstddef> // which just has the below anyway
//#define offsetof __builtin_offsetof
template<class T>
struct A {
    int d;
    //void f() { int n = offsetof(A, d); } // works (correctly)
    static int const n = offsetof(A, d); // works (but shouldn't afaik)
    //void f() { char a[offsetof(A, d)+1]; } // works (correctly)
    //char a[offsetof(A, d)+1]; // ICE
    //char a[offsetof(A, d)]; // ICE
};
int main() {
    A<int> l;
}

** Affects: gcc-4.3 (Ubuntu)
     Importance: Undecided
         Status: New

-- 
internal compiler error: offsetof within class template definition
https://bugs.launchpad.net/bugs/479504
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