http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53401
Bug #: 53401
Summary: internal compiler error: Segmentation fault on
infinite argument deduction of constexpr templates
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: [email protected]
ReportedBy: [email protected]
Created attachment 27434
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27434
Outputs from -v option (repeated error messages are snipped) and preprocessed
source.
The following invalid code causes an ICE with GCC 4.8.0 20120513 (experimental)
and -std=c++11.
/////////////////////////////////////////////
template<int I>
struct index
{};
constexpr int recursive_impl(index<0u>)
{
return 0;
}
template<int N>
constexpr auto recursive_impl(index<N>) // Line 11
-> decltype(recursive_impl(index<N - 1>()))
{
return recursive_impl(index<N - 1>());
}
template<int N>
constexpr auto recursive()
-> decltype(recursive_impl(index<N>()))
{
return recursive_impl(index<N>());
}
void f(int i)
{
recursive<1>();
}
/////////////////////////////////////////////
g++: internal compiler error: Segmentation fault (program cc1plus)
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
The above-mentioned code is invalid because there isn't anything to prevent the
compiler from trying infinite template argument deduction in the second
overload of `recursive_impl' (Line 11). So, I expect error messages like
"template instantiation depth exceeds maximum...". However, the compiler dies
in segmentation fault.
`constexpr' is necessary to reproduce the ICE. Otherwise, the compiler outputs
ordinary error messages as expected.
4.6.4 20120511 (prerelease) and 4.7.1 20120512 (prerelease) also cause the same
problem, too.
