http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60779
Bug ID: 60779
Summary: -fcx-fortran-rules ignored when using -flto
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: dturnbull at gmail dot com
Using the following test code on g++-4.9 (GCC) 4.9.0 20140330
if (isnan((complex<float>(1,0) / complex<float>(0,0)).real())) {
cout << "Fortran rules: \n";
} else {
cout << "ISO rules: \n";
}
The -fcx-fortran-rules option behaves as expected. The test code indicates
Fortran rules are being used and performance indicates the NaN checking is
indeed disabled.
When enabling both -fcx-fortran-rules and -flto the test code indicates ISO
rules are being used and performance is identical to compiling without
-fcx-fortran-rules.
This happens in both the C and C++ compilers.
