https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88341
Bug ID: 88341
Summary: taking norm() of complex variable fails to compile
with -std=c++11
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: p.vanhoof at oma dot be
Target Milestone: ---
Created attachment 45145
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45145&action=edit
preprocessed file
The attached code fails to compile with the mainline at r266725.
% g++ -std=c++11 -W -Wall -c bug.cc
In file included from bug.cc:1:
/usr/local/gcc900/include/c++/9.0.0/complex: In instantiation of ‘static
constexpr _Tp std::_Norm_helper<true>::_S_do_it(const std::complex<_Tp>&) [with
_Tp = double]’:
/usr/local/gcc900/include/c++/9.0.0/complex:689:35: required from ‘_Tp
std::norm(const std::complex<_Tp>&) [with _Tp = double]’
bug.cc:5:20: required from here
/usr/local/gcc900/include/c++/9.0.0/complex:681:9: error: body of ‘constexpr’
function ‘static constexpr _Tp std::_Norm_helper<true>::_S_do_it(const
std::complex<_Tp>&) [with _Tp = double]’ not a return-statement
681 | }
| ^
% cat bug.cc
#include <complex>
double n(std::complex<double>& c)
{
return std::norm(c);
}
The code compiles correctly with all release versions I tried, including 8.2.0,
so this is a regression from g++ 8.
% g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/local/gcc900/lib/gcc/x86_64-pc-linux-gnu/9.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-mainline/configure --prefix=/usr/local/gcc900
--enable-languages=c,c++,fortran
Thread model: posix
gcc version 9.0.0 20181202 (experimental) (GCC)
