[Bug c++/54928] New: Infinite output with after ICE with macro

[cas43 at cs dot stanford.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54928

             Bug #: 54928
           Summary: Infinite output with after ICE with macro
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: ca...@cs.stanford.edu


Compiling this without options produces infinite output.

#define M(x) x
template<class T> class A {void F(){M(sizeof(double));}};
template class A<int>;


Beginning of output:

prog.cpp: In instantiation of ‘void A<T>::F() [with T = int]’:
prog.cpp:3:16:   required from here
prog.cpp:2:45: internal compiler error: in tsubst_copy, at cp/pt.c:12349
 template<class T> class A {void F(){M(sizeof(double));}};
                                             ^
prog.cpp:1:14: note: in definition of macro 'M'
 #define M(x) x
              ^
prog.cpp:2:45: internal compiler error: in internal_error, at diagnostic.c:1069
 template<class T> class A {void F(){M(sizeof(double));}};
                                             ^
prog.cpp:1:14: note: in definition of macro 'M'
 #define M(x) x
              ^
<the last bit repeats over and over.>


Output of g++ -v:
Using built-in specs.
COLLECT_GCC=/new-gcc/i-4.8/bin/g++
COLLECT_LTO_WRAPPER=/new-gcc/i-4.8/libexec/gcc/x86_64-unknown-linux-gnu/4.8.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../s-4.8/configure --prefix=/new-gcc/i-4.8
Thread model: posix
gcc version 4.8.0 20121014 (experimental) (GCC) 


I filed the ICE leading up to the infinite loop as a separate bug.