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.
