[Bug c++/68207] New: internal compiler error: in reshape_init_class, at cp/decl.c:5469 caused by nested struct initialization

["i.am.inuyasha at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68207

            Bug ID: 68207
           Summary: internal compiler error: in reshape_init_class, at
                    cp/decl.c:5469 caused by nested struct initialization
           Product: gcc
           Version: 5.2.0
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: i.am.inuyasha at gmail dot com
  Target Milestone: ---

Created attachment 36644
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36644&action=edit
test.ii

$ cat test.cpp 
typedef struct {
        int x, y, z;
} Vertex;

typedef struct {
        int cmd;
        struct {
                Vertex pos;
        };
} Command;

int main(int argc, char **argv) {
        Command c = {
                .cmd = 0,
        };

        c = {
                .cmd = 1,
                .pos = {.x=-2, .y=0, .z=-6},
        };
        return 0;
}

$ gcc -v -save-temps test.cpp -o gcctest && ./gcctest
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-unknown-linux-gnu/5.2.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: /build/gcc/src/gcc-5.2.0/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 --with-default-libstdcxx-abi=gcc4-compatible
Thread model: posix
gcc version 5.2.0 (GCC) 
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-o' 'gcctest' '-mtune=generic'
'-march=x86-64'
 /usr/lib/gcc/x86_64-unknown-linux-gnu/5.2.0/cc1plus -E -quiet -v -D_GNU_SOURCE
test.cpp -mtune=generic -march=x86-64 -fpch-preprocess -o test.ii
ignoring nonexistent directory
"/usr/lib/gcc/x86_64-unknown-linux-gnu/5.2.0/../../../../x86_64-unknown-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/lib/gcc/x86_64-unknown-linux-gnu/5.2.0/../../../../include/c++/5.2.0

/usr/lib/gcc/x86_64-unknown-linux-gnu/5.2.0/../../../../include/c++/5.2.0/x86_64-unknown-linux-gnu

/usr/lib/gcc/x86_64-unknown-linux-gnu/5.2.0/../../../../include/c++/5.2.0/backward
 /usr/lib/gcc/x86_64-unknown-linux-gnu/5.2.0/include
 /usr/local/include
 /usr/lib/gcc/x86_64-unknown-linux-gnu/5.2.0/include-fixed
 /usr/include
End of search list.
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-o' 'gcctest' '-mtune=generic'
'-march=x86-64'
 /usr/lib/gcc/x86_64-unknown-linux-gnu/5.2.0/cc1plus -fpreprocessed test.ii
-quiet -dumpbase test.cpp -mtune=generic -march=x86-64 -auxbase test -version
-o test.s
GNU C++ (GCC) version 5.2.0 (x86_64-unknown-linux-gnu)
        compiled by GNU C version 5.2.0, GMP version 6.0.0, MPFR version
3.1.3-p4, MPC version 1.0.3
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU C++ (GCC) version 5.2.0 (x86_64-unknown-linux-gnu)
        compiled by GNU C version 5.2.0, GMP version 6.0.0, MPFR version
3.1.3-p4, MPC version 1.0.3
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 9ed1d81099b98de89457560501a9ea0c
test.cpp: In function âint main(int, char**)â:
test.cpp:20:2: warning: extended initializer lists only available with
-std=c++11 or -std=gnu++11
  };
  ^
test.cpp:17:4: warning: extended initializer lists only available with
-std=c++11 or -std=gnu++11
  c = {
    ^
test.cpp:17:4: internal compiler error: in reshape_init_class, at
cp/decl.c:5469
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://bugs.archlinux.org/> for instructions.


Happening on Arch AMD64 with latest version from repo. Using --std=c++11
suppresses the warnings but doesn't prevent the internal error.