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Date:      Fri, 21 Aug 2020 04:32:14 +0000
From:      bugzilla-noreply@freebsd.org
To:        toolchain@FreeBSD.org
Subject:   [Bug 248795] std::random_shuffle broken with LLVM11
Message-ID:  <bug-248795-29464@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D248795

            Bug ID: 248795
           Summary: std::random_shuffle broken with LLVM11
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Keywords: regression
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: toolchain@FreeBSD.org
          Reporter: tobik@freebsd.org
                CC: toolchain@FreeBSD.org
             Flags: maintainer-feedback?(toolchain@FreeBSD.org)
                CC: toolchain@FreeBSD.org

The following example no longer compiles after the LLVM11 import.
This affects a number of ports like x11/workrave, www/newsboat,
japanese/zinnia, ...  I can patch them to use shuffle instead, but
even though random_shuffle is deprecated it should still work,
right?

$ cat foo.cc
#include <algorithm>
#include <vector>

int main()
{
    std::vector<int> v =3D {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
    std::random_shuffle(v.begin(), v.end());
}
$ c++ foo.cc
foo.cc:7:10: warning: 'random_shuffle<std::__1::__wrap_iter<int *>>' is
deprecated [-Wdeprecated-declarations]
    std::random_shuffle(v.begin(), v.end());
         ^
/usr/include/c++/v1/algorithm:3095:1: note:
'random_shuffle<std::__1::__wrap_iter<int *>>' has been explicitly marked
deprecated here
_LIBCPP_DEPRECATED_IN_CXX14 void
^
/usr/include/c++/v1/__config:991:39: note: expanded from macro
'_LIBCPP_DEPRECATED_IN_CXX14'
#  define _LIBCPP_DEPRECATED_IN_CXX14 _LIBCPP_DEPRECATED
                                      ^
/usr/include/c++/v1/__config:974:48: note: expanded from macro
'_LIBCPP_DEPRECATED'
#    define _LIBCPP_DEPRECATED __attribute__ ((deprecated))
                                               ^
1 warning generated.
ld: error: undefined symbol: std::__1::__rs_get()
>>> referenced by foo.cc
>>>               /tmp/foo-6a4153.o:(void std::__1::random_shuffle<std::__1=
::__wrap_iter<int*> >(std::__1::__wrap_iter<int*>, std::__1::__wrap_iter<in=
t*>))

ld: error: undefined symbol: std::__1::__rs_default::~__rs_default()
>>> referenced by foo.cc
>>>               /tmp/foo-6a4153.o:(void std::__1::random_shuffle<std::__1=
::__wrap_iter<int*> >(std::__1::__wrap_iter<int*>, std::__1::__wrap_iter<in=
t*>))
>>> referenced by foo.cc
>>>               /tmp/foo-6a4153.o:(void std::__1::random_shuffle<std::__1=
::__wrap_iter<int*> >(std::__1::__wrap_iter<int*>, std::__1::__wrap_iter<in=
t*>))

ld: error: undefined symbol: std::__1::__rs_default::operator()()
>>> referenced by foo.cc
>>>               /tmp/foo-6a4153.o:(std::__1::__independent_bits_engine<st=
d::__1::__rs_default, unsigned long>::__eval(std::__1::integral_constant<bo=
ol, true>))
>>> referenced by foo.cc
>>>               /tmp/foo-6a4153.o:(std::__1::__independent_bits_engine<st=
d::__1::__rs_default, unsigned long>::__eval(std::__1::integral_constant<bo=
ol, true>))
c++: error: linker command failed with exit code 1 (use -v to see invocatio=
n)

--=20
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