http://llvm.org/bugs/show_bug.cgi?id=14771
Bug #: 14771
Summary: c++11: Fibonacci numbers calculations cause infinite
loop
Product: clang
Version: 3.2
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++11
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
I play with c++11. And such code cause 100% cpu usage during 1 hour,
after that I just press ctrl+c.
#include <cstdio>
constexpr unsigned int fib(unsigned int N)
{
return N <= 1 ? 1 : (fib(N - 1) + fib(N - 2));
}
template <unsigned int N>
struct Fib {
enum { value = fib(N) };
};
int main()
{
printf("%u\n", Fib<1000>::value);
}
I run clang in such way:
clang++ -fconstexpr-depth=10000 -Wall -std=c++0x test8.cpp
PS
time g++ -fconstexpr-depth=10000 -Wall -std=c++0x test8.cpp
real 0m0.108s
user 0m0.080s
sys 0m0.010s
So > 1 hour of work seems strange.
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