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From: "okannen at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/94679] New: link time error: undefined reference to
 std::projected<...>::operator *() const
Date: Tue, 21 Apr 2020 07:13:56 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94679

            Bug ID: 94679
           Summary: link time error: undefined reference to
                    std::projected<...>::operator *() const
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: okannen at gmail dot com
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu
            Target: x86_64
             Build: x86_64-pc-linux-gnu

When compiling with -coverage -fkeep-inline-functions, it is possible to ge=
t a
linkage error: 'undefined reference to
`std::projected<int*,std::identity>::operator*() const'


gcc --version:
gcc (GCC) 10.0.1 20200416 (experimental)
Copyright (C) 2020 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

gcc -v:
Using built-in specs.
COLLECT_GCC=3Dgcc
COLLECT_LTO_WRAPPER=3D/home/olivier/usr/libexec/gcc/x86_64-pc-linux-gnu/10/=
lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc/configure --enable-libsanitizer
--prefix=3D/home/olivier/usr/ --with-gcc-major-version-only --disable-boots=
trap
--enable-language=3Dc,c++,lto
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 10.0.1 20200416 (experimental) (GCC)


The following code compiled with:
'c++ -coverage -fkeep-inline-functions -std=3Dc++20 file.cpp'

#include <algorithm>
int main(){
  int a[]=3D{1,2,3};
  std::ranges::next_permutation(a);
  return 0;
  }

This produce error message:
/usr/bin/ld: /tmp/ccF8BXBM.o: in function `decltype(auto)
std::ranges::__cust_imove::_IMove::operator()<std::projected<int*,
std::identity>&>(std::projected<int*, std::identity>&) const':
test.cpp:(.text._ZNKSt6ranges12__cust_imove6_IMoveclIRSt9projectedIPiSt8ide=
ntityEEEDcOT_[_ZNKSt6ranges12__cust_imove6_IMoveclIRSt9projectedIPiSt8ident=
ityEEEDcOT_]+0x2a):
undefined reference to `std::projected<int*, std::identity>::operator*() co=
nst'
/usr/bin/ld: /tmp/ccF8BXBM.o: in function `decltype(auto)
std::ranges::__cust_imove::_IMove::operator()<std::projected<int*,
std::identity> const&>(std::projected<int*, std::identity> const&) const':
test.cpp:(.text._ZNKSt6ranges12__cust_imove6_IMoveclIRKSt9projectedIPiSt8id=
entityEEEDcOT_[_ZNKSt6ranges12__cust_imove6_IMoveclIRKSt9projectedIPiSt8ide=
ntityEEEDcOT_]+0x2a):
undefined reference to `std::projected<int*, std::identity>::operator*() co=
nst'
collect2: error: ld returned 1 exit status=