#694 gcc 4/5/7 ICE on boost::call_once

[Jacob Godserv]

gcc 4.9.4, 5.4.0, and 7.2.0 all fail with this error:

C:\Users\username\repos\project\bin\boost-win64-1.57/boost/thread/detail/invoke.hpp: In function 'decltype (*(forward<A0>)(*boost::detail::invoke::a0).**boost::detail::invoke::f) boost::detail::invoke(Fp&&, A0&&) [with Fp = void (A::*)(); A0 = A*; decltype (*(forward<A0>)(*boost::detail::invoke::a0).**boost::detail::invoke::f) = void (A::)()]':
C:\Users\username\repos\project\bin\boost-win64-1.57/boost/thread/detail/invoke.hpp:102:43: internal compiler error: in gimplify_expr, at gimplify.c:8858
libbacktrace could not find executable to open
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://sourceforge.net/projects/mingw-w64> for instructions.

On the following minimum test case:

#include <boost/thread.hpp>

class A
{
public:
    A() {}

    void doA();
private:
    void doB() { }
    boost::once_flag onceFlag;
};

void A::doA()
{
    boost::call_once(onceFlag, &A::doB, this);
}

I've attached gcc's intermediate output so you don't need the boost/thread.hpp include to see the error.

Compile it like so:
x86_64-5.4.0-release-win32-seh-rt_v5-rev0/mingw64/bin/g++ -std=c++11 TestClass.ii

[LIU Hao]

Confirmed on GCC 7.2.1 . This seems a GCC bug. Please report it to https://gcc.gnu.org/bugzilla/ .