https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63728
Bug ID: 63728
Summary: Memory exhaustion using constexpr constructors for
classes with large array members
Product: gcc
Version: 5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: gcc-bugzilla at bmevers dot de
Having a constexpr constructor on a class with a large array member will result
in excessive memory usage. For example, I wasn't able to compile the following
program using -std=c++11 on a machine with 4GiB of RAM:
#include <bitset>
int main() {
std::bitset<2147483648> bs;
}
This happens because the constructor of bitset is constexpr, so it will try to
initialize the large member array at compile time, which will create at least
one ast tree node for every element in the array. (gcc/cp/constexpr.c:1874)
