https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80556
--- Comment #3 from Dominique d'Humieres <dominiq at lps dot ens.fr> --- > Other native platforms seem fine, so please post a backtrace. The best I can do without further directives: [Book15] ada/rts% lldb /opt/gcc/build_a/gcc/gnat1 (lldb) run -O2 g-exptty.adb Process 95815 launched: '/opt/gcc/build_a/gcc/gnat1' (x86_64) Process 95815 stopped * thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGABRT frame #0: 0x00007fffa7e8fd42 libsystem_kernel.dylib`__pthread_kill + 10 libsystem_kernel.dylib`__pthread_kill: -> 0x7fffa7e8fd42 <+10>: jae 0x7fffa7e8fd4c ; <+20> 0x7fffa7e8fd44 <+12>: movq %rax, %rdi 0x7fffa7e8fd47 <+15>: jmp 0x7fffa7e88caf ; cerror_nocancel 0x7fffa7e8fd4c <+20>: retq (lldb) bt error: gnat1 {0x00179120}: unhandled type tag 0x0021 (DW_TAG_subrange_type), please file a bug and attach the file at the start of this error message ... a bunch of similar errors ... * thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGABRT * frame #0: 0x00007fffa7e8fd42 libsystem_kernel.dylib`__pthread_kill + 10 frame #1: 0x00007fffa7f7d5bf libsystem_pthread.dylib`pthread_kill + 90 frame #2: 0x00007fffa7df5420 libsystem_c.dylib`abort + 129 frame #3: 0x0000000100ff88c1 gnat1`uw_init_context_1(context=<unavailable>, outer_cfa=<unavailable>, outer_ra=<unavailable>) at unwind-dw2.c:1579 frame #4: 0x0000000100ff8f2e gnat1`_Unwind_RaiseException(exc=0x0000000144a022a0) at unwind.inc:88 frame #5: 0x000000010006663f gnat1`ada__exceptions__exception_propagation__propagate_gcc_exceptionXn(gcc_exception=0x0000000144a022a0) at a-exexpr.adb:322 frame #6: 0x0000000100066683 gnat1`ada__exceptions__exception_propagation__propagate_exceptionXn(excep=<unavailable>) at a-exexpr.adb:354 frame #7: 0x0000000100066af9 gnat1`ada__exceptions__complete_and_propagate_occurrence(x=<unavailable>) at a-except.adb:937 frame #8: 0x0000000100066b2e gnat1`__gnat_raise_exception(e=<unavailable>, message=<unavailable>) at a-except.adb:978 frame #9: 0x00000001001fbf9a gnat1`rtsfind__load_fail(s=const string___XUP @ 0x00007fe1c0cf6f50, u_id=<unavailable>, id=<unavailable>) at rtsfind.adb:851 frame #10: 0x00000001001fc316 gnat1`rtsfind__load_rtu(u_id=<unavailable>, id=<unavailable>, use_setting=<unavailable>) at rtsfind.adb:987 frame #11: 0x00000001001fc74e gnat1`rtsfind__rte at rtsfind.adb:1380 frame #12: 0x00000001001fcab8 gnat1`rtsfind__rte_available(e=<unavailable>) at rtsfind.adb:1462 frame #13: 0x000000010011d4ad gnat1`exp_ch9__expand_n_delay_relative_statement(n=<no summary available>) at exp_ch9.adb:8068 frame #14: 0x000000010017078f gnat1`expander__expand(n=<no summary available>) at expander.adb:214 frame #15: 0x00000001002124d8 gnat1`sem__analyze(n=<no summary available>) at sem.adb:753 frame #16: 0x000000010029d347 gnat1`sem_ch5__analyze_statements(l=<no summary available>) at sem_ch5.adb:3613 frame #17: 0x000000010029f06e gnat1`sem_ch5__analyze_if_statement(n=<no summary available>) at sem_ch5.adb:1665 frame #18: 0x0000000100212bf0 gnat1`sem__analyze(n=<no summary available>) at sem.adb:306 frame #19: 0x000000010029d347 gnat1`sem_ch5__analyze_statements(l=<no summary available>) at sem_ch5.adb:3613 frame #20: 0x00000001002396ee gnat1`sem_ch11__analyze_handled_statements(n=<no summary available>) at sem_ch11.adb:426 frame #21: 0x0000000100212882 gnat1`sem__analyze(n=<no summary available>) at sem.adb:297 frame #22: 0x00000001002ad694 gnat1`sem_ch6__analyze_subprogram_body(n=<unavailable>) at sem_ch6.adb:4245 frame #23: 0x0000000100212ace gnat1`sem__analyze(n=<no summary available>) at sem.adb:547 frame #24: 0x000000010027767b gnat1`sem_ch3__analyze_declarations(l=<no summary available>) at sem_ch3.adb:2608 frame #25: 0x00000001002b2dbe gnat1`sem_ch7__analyze_package_body(n=<no summary available>) at sem_ch7.adb:786 frame #26: 0x0000000100212ada gnat1`sem__analyze(n=<no summary available>) at sem.adb:444 frame #27: 0x0000000100236c22 gnat1`sem_ch10__analyze_compilation_unit(n=<no summary available>) at sem_ch10.adb:897 frame #28: 0x0000000100212713 gnat1`sem__analyze(n=<no summary available>) at sem.adb:180 frame #29: 0x0000000100213863 gnat1`sem__semantics at sem.adb:1338 frame #30: 0x00000001002137e6 gnat1`sem__semantics frame #31: 0x0000000100182fd4 gnat1`_ada_frontend at frontend.adb:407 frame #32: 0x000000010037a6b1 gnat1`_ada_gnat1drv at gnat1drv.adb:1127 frame #33: 0x000000010001daff gnat1`::gnat_parse_file() at misc.c:122 frame #34: 0x0000000100c583ca gnat1`::compile_file() at toplev.c:467 frame #35: 0x0000000100ffd717 gnat1`toplev::main(int, char**) at toplev.c:2003 frame #36: 0x0000000100ffd227 gnat1`toplev::main(this=0x00007fff5fbff2fe, argc=<unavailable>, argv=<unavailable>) frame #37: 0x0000000100fff2fe gnat1`main(argc=3, argv=0x00007fff5fbff330) at main.c:39 frame #38: 0x00007fffa7d61235 libdyld.dylib`start + 1