[Bug c++/86503] New: Segmentation fault signal terminated

[zhonghao at pku dot org.cn]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86503

            Bug ID: 86503
           Summary: Segmentation fault signal terminated
           Product: gcc
           Version: 8.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zhonghao at pku dot org.cn
  Target Milestone: ---

The code is as follow:

template< bool c, class T >
struct enable_if {
    typedef T type;
};

template< class T >
struct enable_if< true, T > {};

template< class F, int n >
void
ft( F f, typename enable_if< n == 0, int >::type ) {}

template< class F, int n >
typeof( ft< F, n-1 >( F(), 0 ) )
ft( F f, typename enable_if< n != 0, int >::type ) {}

int main() {
    ft< struct a*, 2 >( 0, 0 );
}

g++ produces the following error message:

3regressiontestusingG++typeof.cpp: In substitution of 'template<class F, int n>
__typeof__ (ft<F, (n - 1)>(F(), 0)) ft(F, typename enable_if<(n != 0),
int>::type) [with F = main()::a*; int n = -897]':
3regressiontestusingG++typeof.cpp:14:21:   recursively required by substitution
of 'template<class F, int n> __typeof__ (ft<F, (n - 1)>(F(), 0)) ft(F, typename
enable_if<(n != 0), int>::type) [with F = main()::a*; int n = 1]'
3regressiontestusingG++typeof.cpp:14:21:   required by substitution of
'template<class F, int n> __typeof__ (ft<F, (n - 1)>(F(), 0)) ft(F, typename
enable_if<(n != 0), int>::type) [with F = main()::a*; int n = 2]'
3regressiontestusingG++typeof.cpp:18:30:   required from here
3regressiontestusingG++typeof.cpp:14:21: fatal error: template instantiation
depth exceeds maximum of 900 (use -ftemplate-depth= to increase the maximum)
 typeof( ft< F, n-1 >( F(), 0 ) )
       ~~~~~~~~~~~~~~^~~~~~~~~~~~
compilation terminated.

So, I change the command line to:
g++ -ftemplate-depth=1000000 3regressiontestusingG++typeof.cpp 

This time, the error message is as follow:

g++: internal compiler error: Segmentation fault signal terminated program
cc1plus
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc.gnu.org/bugs/> for instructions.

Anyway, clang++ accepts the code.