https://llvm.org/bugs/show_bug.cgi?id=27115
Bug ID: 27115
Summary: libc++ problem with std::enable_shared_from_this
Product: libc++
Version: 3.8
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: cb...@lgsinnovations.com
CC: llvm-bugs@lists.llvm.org, mclow.li...@gmail.com
Classification: Unclassified
Created attachment 16122
--> https://llvm.org/bugs/attachment.cgi?id=16122&action=edit
Main program. Build with clang++ -std=c++11 -stdlib=libc++ main.cpp
We observe that the compiler fails when trying to build the simple example of
code provided with Apple clang++ version 703.0.29 on Mac 10.11 and with clang++
3.8.0 using libc++ on RedHat 7. g++ 4.9.2 on RedHat 7 does not exhibit the
problem. The error reported is:
clang++ -Werror -Wpedantic -Wall -std=c++11 main.cpp
In file included from main.cpp:1:
In file included from
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/iostream:38:
In file included from
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/ios:216:
In file included from
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/__locale:15:
In file included from
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/string:439:
In file included from
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/algorithm:628:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/memory:4092:61:
error: cannot cast 'const std::__1::enable_shared_from_this<Foo> *' to 'const
Foo *' via
virtual base 'std::__1::enable_shared_from_this<Foo>'
__e->__weak_this_.__ptr_ = const_cast<_Yp*>(static_cast<const
_Yp*>(__e));
^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/memory:4389:9:
note: in instantiation of function template specialization
'std::__1::shared_ptr<Bar>::__enable_weak_this<Foo>' requested here
__r.__enable_weak_this(__r.__ptr_);
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/memory:4749:29:
note: in instantiation of function template specialization
'std::__1::shared_ptr<Bar>::make_shared<int>' requested here
return shared_ptr<_Tp>::make_shared(_VSTD::forward<_Args>(__args)...);
^
main.cpp:12:35: note: in instantiation of function template specialization
'std::__1::make_shared<Bar, int>' requested here
std::shared_ptr<Bar> a = std::make_shared<Bar>(2);
^
1 error generated.
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