Comment 2 for bug 1860254

Hi Mike,

I was able to reduce your testcase to this code:

$ cat DioBoard.ii
template <typename> class a;
class {
  void b(a... c);
}

It is failing (Throwing ICE with -g2 and -g3):

$ $HOME/toolchains/gcc-arm-none-eabi-9-2019-q4-major/bin/arm-none-eabi-g++ -g2 -O0 -c -mthumb -mcpu=cortex-m4 -D__SAME54N19A__ -std=c++17 -fno-rtti -MMD -Wall -Wextra -ffunction-sections -fdata-sections -exceptions -D PLATFORM_thingios -D PLATFORM_freertos -D OPTION_exceptions -D OPTION_firmware_version="0.0.1" -D OPTION_embedded -c DioBoard.ii
DioBoard.ii:2:7: internal compiler error: in is_base_type, at dwarf2out.c:12987
    2 | class {
      | ^

I think it would be best if you report it upstream: https://gcc.gnu.org/bugs

If you wish I can report it in your name. Please let me know.

kind regards
Przemek