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From: "i.nixman at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/51265] New: internal compiler error: in finish_decltype_type, at cp/semantics.c:5244
Date: Tue, 22 Nov 2011 08:05:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51265

             Bug #: 51265
           Summary: internal compiler error: in finish_decltype_type, at
                    cp/semantics.c:5244
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: i.nixman@gmail.com


When I try to compile following code, I get error:
test1.cpp: In instantiation of 'void xx(T*, A ...) [with X = int
(Funny::*)(int) const; X ff = &Funny::print3; R = int; T = Funny; A = {int}]':
test1.cpp:35:74:   required from here
test1.cpp:23:9: internal compiler error: in finish_decltype_type, at
cp/semantics.c:5244

code:


#include <iostream>

struct Funny {
    void print(int i) {
        std::cout << "void (Funny::*)(int): " << i << std::endl;
    }
    int print2(int i) {
        std::cout << "int (Funny::*)(int): " << i << std::endl;
        return i;
    }
    int print3(int i)  const {
        std::cout << "int (Funny::*)(int) const: " << i << std::endl;
        return i;
    }
};
template<typename T, typename X, X ff>
void c(){ T abc; (abc.*ff)(123); }
template<typename X, X ff, typename R, typename T, typename... A >
void xx(T* _obj, A... args){
    for (int i : {2,4}) std::cout << i << std::endl; // #3 int i is OK
    {
/* 23 */ c<T, decltype(ff), ff>(); // #1 summary error trigger here
    }

    std::cout << "xx()" << std::endl;
    (_obj->*(ff))(args...);
    // #2 can not define any object here, even int
    // T abc; 
    //(abc.*ff)(args...);
}
int main()
{
    Funny abc;
/* 35 */ xx<int (Funny::*)(int)const, &Funny::print3, int, Funny, int>(&abc,
3);
    return 0;
}


configured with:
C:\test>g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=c:/mingw/bin/../libexec/gcc/i686-pc-mingw32/4.7.0/lto-wrappe
r.exe
Target: i686-pc-mingw32
Configured with: ../../mingw-src/gcc-trunk/configure --host=i686-pc-mingw32
--bu
ild=i686-pc-mingw32 --target=i686-pc-mingw32 --prefix=/mingw-sjlj-x86
--with-arc
h=i686 --with-tune=generic --enable-languages=c,c++,lto,fortran,objc,obj-c++
--w
ith-host-libstdcxx=-lstdc++ --disable-shared --enable-static
--enable-cxx-flags=
'-fno-function-sections -fno-data-sections' --enable-libstdcxx-time=yes
--enable
-libgomp --enable-lto --enable-graphite --enable-cloog-backend=isl
--enable-chec
king=release --enable-fully-dynamic-string --enable-threads=posix
--disable-libs
tdcxx-pch --enable-libstdcxx-debug --enable-sjlj-exceptions --disable-debug
--di
sable-bootstrap --disable-multilib --disable-rpath --disable-win32-registry
--di
sable-nls --disable-werror --disable-symvers --with-gmp=/mingw-libs
--with-mpfr=
/mingw-libs --with-mpc=/mingw-libs --with-ppl=/mingw-libs
--with-cloog=/mingw-li
bs --with-libiconv-prefix=/mingw-libs --with-pkgversion='niXman build'
Thread model: posix