[Bug c++/93320] internal compiler error: in is_base_type, at dwarf2out.c:12987

[Bug c++/93320] internal compiler error: in is_base_type, at dwarf2out.c:12987

[vopl at bk dot ru]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93320

vopl at bk dot ru changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |vopl at bk dot ru

--- Comment #7 from vopl at bk dot ru ---
Very similar ICE here. Affected versions are 9 and 10 but not 11. The problem
take place only with -g option supplied



$cat b11.cpp && echo EOFFFFFF
template <class=void>
struct Generic
{
    template <class=void> using Api = decltype([](){});
};

template <class T>
struct Def
{
    using Api = Generic<T>::template Api<>;
};

Def<int> d;
EOFFFFFF



$ g++ -v -g -std=c++20 b11.cpp
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/10.2.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with:
/var/tmp/portage/sys-devel/gcc-10.2.0-r5/work/gcc-10.2.0/configure
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/10.2.0
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/10.2.0
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/10.2.0/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/10.2.0/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/include/g++-v10
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/10.2.0/python
--enable-languages=c,c++,fortran --enable-obsolete --enable-secureplt
--disable-werror --with-system-zlib --disable-nls --enable-checking=release
--with-bugurl=https://bugs.gentoo.org/ --with-pkgversion='Gentoo 10.2.0-r5 p6'
--disable-esp --enable-libstdcxx-time --with-build-config=bootstrap-lto
--enable-shared --enable-threads=posix --enable-__cxa_atexit
--enable-clocale=gnu --enable-multilib --with-multilib-list=m32,m64
--disable-fixed-point --enable-targets=all --enable-libgomp --disable-libssp
--disable-libada --enable-systemtap --enable-vtable-verify --with-zstd
--enable-lto --with-isl --disable-isl-version-check --enable-default-pie
--disable-default-ssp
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 10.2.0 (Gentoo 10.2.0-r5 p6) 
COLLECT_GCC_OPTIONS='-v' '-g' '-std=c++2a' '-shared-libgcc' '-mtune=generic'
'-march=x86-64'
 /usr/libexec/gcc/x86_64-pc-linux-gnu/10.2.0/cc1plus -quiet -v -D_GNU_SOURCE
b11.cpp -quiet -dumpbase b11.cpp -mtune=generic -march=x86-64 -auxbase b11 -g
-std=c++2a -version -o /tmp/ccSzE9Pi.s
GNU C++17 (Gentoo 10.2.0-r5 p6) version 10.2.0 (x86_64-pc-linux-gnu)
        compiled by GNU C version 10.2.0, GMP version 6.2.1, MPFR version
4.1.0, MPC version 1.2.1, isl version isl-0.23-GMP

GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory
"/usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../x86_64-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/include/g++-v10
 /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/include/g++-v10/x86_64-pc-linux-gnu
 /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/include/g++-v10/backward
 /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/include
 /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/include-fixed
 /usr/include
End of search list.
GNU C++17 (Gentoo 10.2.0-r5 p6) version 10.2.0 (x86_64-pc-linux-gnu)
        compiled by GNU C version 10.2.0, GMP version 6.2.1, MPFR version
4.1.0, MPC version 1.2.1, isl version isl-0.23-GMP

GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 109a96b688365221cca69113b161e683
b11.cpp: In instantiation of 'struct Def<int>':
b11.cpp:15:10:   required from here
b11.cpp:9:8: internal compiler error: in is_base_type, at dwarf2out.c:12994
    9 | struct Def
      |        ^~~
0x5f1460 is_base_type
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/dwarf2out.c:12994
0x5f1460 is_base_type
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/dwarf2out.c:12964
0xe773ec modified_type_die
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/dwarf2out.c:13432
0xe76ce3 add_type_attribute
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/dwarf2out.c:21587
0xe71356 gen_typedef_die
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/dwarf2out.c:25406
0xe70e8a gen_decl_die
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/dwarf2out.c:26364
0xe8ce3c gen_member_die
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/dwarf2out.c:25183
0xe8ce3c gen_struct_or_union_type_die
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/dwarf2out.c:25279
0xe8ce3c gen_tagged_type_die
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/dwarf2out.c:25480
0xe7383d gen_type_die_with_usage
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/dwarf2out.c:25675
0xe731c6 gen_type_die
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/dwarf2out.c:25729
0xe70a87 gen_decl_die
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/dwarf2out.c:26361
0xe27a00 dwarf2out_decl
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/dwarf2out.c:26909
0xe89587 dwarf2out_type_decl
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/dwarf2out.c:26634
0xe89587 rest_of_type_compilation(tree_node*, int)
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/passes.c:339
0xf451c3 finish_struct_1(tree_node*)
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/cp/class.c:7506
0x1092c5e instantiate_class_template_1
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/cp/pt.c:12081
0xe2ef20 instantiate_class_template(tree_node*)
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/cp/pt.c:12120
0xe2ef20 complete_type(tree_node*)
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/cp/typeck.c:137
0xe2ef20 complete_type(tree_node*)
        /usr/src/debug/sys-devel/gcc-10.2.0-r5/gcc-10.2.0/gcc/cp/typeck.c:111
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://bugs.gentoo.org/> for instructions.

[Bug c++/93320] internal compiler error: in is_base_type, at dwarf2out.c:12987

[ldalessandro at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93320

Luke Dalessandro <ldalessandro at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ldalessandro at gmail dot com

--- Comment #8 from Luke Dalessandro <ldalessandro at gmail dot com> ---
I'm still seeing failures on this line in 12/trunk with the following invalid
code with std=c++17, **but not with -std=c++20**. Don't think architecture is
important.

```
struct A {
    A(decltype(auto)... xs) {}
};
```

https://godbolt.org/z/neKc1M6sd