https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90423
Bug ID: 90423
Summary: Breakage with C++ <cmath> and "-mlong-double-128"
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: mar...@mpa-garching.mpg.de
Target Milestone: ---
Compiling the code snippet below with "g++ -mlong-double-128" and running the
executable prints "2" to the console on my machine, which is obviously wrong.
Without the "-mlong-double-128" flag the output is correct.
#include <iostream>
#include <cmath>
using namespace std;
int main()
{
long double v=2.;
cout << double(sqrt(v)) << endl;
}
I understand that C++ support for this kind of long doubles may not be
complete, but would it be possible to fail in a more obvious manner?
Reproduced with g++ 8 and trunk on x86_64-pc-linux-gnu.
