[Bug c++/82148] New: ICE in assign_temp, at function.c:968

[matthias.hochsteger at tuwien dot ac.at]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82148

            Bug ID: 82148
           Summary: ICE in assign_temp, at function.c:968
           Product: gcc
           Version: 7.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: matthias.hochsteger at tuwien dot ac.at
  Target Milestone: ---

Created attachment 42141
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42141&action=edit
Preprocessed source file

The code below fails to compile with -std=c++17, but compiles with -std=c++14.
A work-around is to add a constructor to 'Base'.

The code (code.ii is attached):

///////////////////////////////////
#include <initializer_list>

struct Base {
    // Working with the follwing line
    // ~Base() {}
};

struct Derived : public Base
{
  Derived (std::initializer_list<int> list) { }
  ~Derived() { }
};

void foo(Base a) { }

void bar() {
    foo(Derived{0});
}
///////////////////////////////////

The compiler call:

> c++ -v -save-temps -std=c++17 -c code.cpp

Using built-in specs.
COLLECT_GCC=c++
Target: x86_64-pc-linux-gnu
Configured with: /build/gcc/src/gcc/configure --prefix=/usr --libdir=/usr/lib
--libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info
--with-bugurl=https://bugs.archlinux.org/
--enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++ --enable-shared
--enable-threads=posix --enable-libmpx --with-system-zlib --with-isl
--enable-__cxa_atexit --disable-libunwind-exceptions --enable-clocale=gnu
--disable-libstdcxx-pch --disable-libssp --enable-gnu-unique-object
--enable-linker-build-id --enable-lto --enable-plugin
--enable-install-libiberty --with-linker-hash-style=gnu
--enable-gnu-indirect-function --disable-multilib --disable-werror
--enable-checking=release --enable-default-pie --enable-default-ssp
Thread model: posix
gcc version 7.2.0 (GCC) 
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-std=c++1z' '-c' '-shared-libgcc'
'-mtune=generic' '-march=x86-64'
 /usr/lib/gcc/x86_64-pc-linux-gnu/7.2.0/cc1plus -E -quiet -v -D_GNU_SOURCE
code.cpp -mtune=generic -march=x86-64 -std=c++1z -fpch-preprocess -o code.ii
ignoring nonexistent directory
"/usr/lib/gcc/x86_64-pc-linux-gnu/7.2.0/../../../../x86_64-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/lib/gcc/x86_64-pc-linux-gnu/7.2.0/../../../../include/c++/7.2.0

/usr/lib/gcc/x86_64-pc-linux-gnu/7.2.0/../../../../include/c++/7.2.0/x86_64-pc-linux-gnu
 /usr/lib/gcc/x86_64-pc-linux-gnu/7.2.0/../../../../include/c++/7.2.0/backward
 /usr/lib/gcc/x86_64-pc-linux-gnu/7.2.0/include
 /usr/local/include
 /usr/lib/gcc/x86_64-pc-linux-gnu/7.2.0/include-fixed
 /usr/include
End of search list.
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-std=c++1z' '-c' '-shared-libgcc'
'-mtune=generic' '-march=x86-64'
 /usr/lib/gcc/x86_64-pc-linux-gnu/7.2.0/cc1plus -fpreprocessed code.ii -quiet
-dumpbase code.cpp -mtune=generic -march=x86-64 -auxbase code -std=c++1z
-version -o code.s
GNU C++14 (GCC) version 7.2.0 (x86_64-pc-linux-gnu)
        compiled by GNU C version 7.2.0, GMP version 6.1.2, MPFR version
3.1.5-p2, MPC version 1.0.3, isl version isl-0.18-GMP

GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU C++14 (GCC) version 7.2.0 (x86_64-pc-linux-gnu)
        compiled by GNU C version 7.2.0, GMP version 6.1.2, MPFR version
3.1.5-p2, MPC version 1.0.3, isl version isl-0.18-GMP

GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: f3b185e2b85ecd352b4699fa98d9eb0f
code.cpp: In function ‘void bar()’:
code.cpp:17:8: internal compiler error: in assign_temp, at function.c:968
     foo(Derived{0});
     ~~~^~~~~~~~~~~~
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://bugs.archlinux.org/> for instructions.

------------------------------------------------------------

Thanks,
Matthias