http://llvm.org/bugs/show_bug.cgi?id=15751
Bug ID: 15751
Summary: reading a long double from a stream is out by a factor
of 10
Product: libc++
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
This issue is causing most of the Boost.Math lib tests to fail, sample code is:
int main(int argc, char** argv)
{
std::stringstream ss;
long double r3;
ss << "304888344611713860501504000000";
ss >> r3;
std::cout << std::setprecision(std::numeric_limits<long
double>::max_digits10) << r3 << std::endl;
r3 = 304888344611713860501504000000.0L;
std::cout << std::setprecision(std::numeric_limits<long
double>::max_digits10) << r3 << std::endl;
return 0;
}
Which outputs:
3.04888344611713860494e+28
3.04888344611713860494e+29
Note how the value read from the stream is 10 times too small :-(
The issue still occurs if I append a ".0" to the input string.
Platform is Ubuntu Linux, latest clang and libc++ SVN Trunk. Same issue with
last release as well. GCC/libstdc++ and MSVC both handle this fine.
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