[Bug c++/102624] testcase lambda-uneval11.C causes cc1plus segment fault

["rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102624

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1
           Keywords|                            |ice-on-valid-code
   Last reconfirmed|                            |2021-10-06

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.

(gdb) bt
#0  0x0000000000b2716e in tree_check (__t=<tree 0x0>, 
    __f=0x2ed9770 "/home/rguenther/src/gcc3/gcc/cp/decl.c", __l=17190, 
    __g=0x2ee3250 <do_push_parm_decls(tree_node*, tree_node*,
tree_node**)::__FUNCTION__> "do_push_parm_decls", __c=FUNCTION_DECL)
    at /home/rguenther/src/gcc3/gcc/tree.h:3432
#1  0x0000000000c66f69 in do_push_parm_decls (decl=<tree 0x0>, 
    args=<parm_decl 0x7ffff66a7d80 s>, nonparms=0x7fffffffd7f8)
    at /home/rguenther/src/gcc3/gcc/cp/decl.c:17190
#2  0x0000000000c6701e in store_parm_decls (
    current_function_parms=<parm_decl 0x7ffff66a7d80 s>)
    at /home/rguenther/src/gcc3/gcc/cp/decl.c:17222
#3  0x0000000000c660b0 in start_preparsed_function (
    decl1=<function_decl 0x7ffff66b0700 spam>, attrs=<tree 0x0>, flags=1)
    at /home/rguenther/src/gcc3/gcc/cp/decl.c:17078
#4  0x0000000000e8a6ad in instantiate_body (
    pattern=<template_decl 0x7ffff66a7280 spam>, 
    args=<tree_vec 0x7ffff668bc00>, d=<function_decl 0x7ffff66b0700 spam>, 
    nested_p=false) at /home/rguenther/src/gcc3/gcc/cp/pt.c:26037
#5  0x0000000000e8c3f9 in instantiate_decl (
    d=<function_decl 0x7ffff66b0700 spam>, defer_ok=false, 
    expl_inst_class_mem_p=false) at /home/rguenther/src/gcc3/gcc/cp/pt.c:26344
#6  0x0000000000e8c7a6 in instantiate_pending_templates (retries=0)
    at /home/rguenther/src/gcc3/gcc/cp/pt.c:26423
#7  0x0000000000c89a19 in c_parse_final_cleanups ()
    at /home/rguenther/src/gcc3/gcc/cp/decl2.c:5009
#8  0x0000000000fdcd32 in c_common_parse_file ()
    at /home/rguenther/src/gcc3/gcc/c-family/c-opts.c:1259
#9  0x00000000017adc20 in compile_file ()
    at /home/rguenther/src/gcc3/gcc/toplev.c:456
#10 0x00000000017b0dcb in do_compile (no_backend=false)
    at /home/rguenther/src/gcc3/gcc/toplev.c:2215
#11 0x00000000017b117f in toplev::main (this=0x7fffffffdd1a, argc=5, 
    argv=0x7fffffffde28) at /home/rguenther/src/gcc3/gcc/toplev.c:2363
#12 0x0000000002d9c73e in main (argc=5, argv=0x7fffffffde28)
    at /home/rguenther/src/gcc3/gcc/main.c:39

fndecl is current_function_decl but that's NULLed when we do

#0  finish_function (inline_p=true)
    at /home/rguenther/src/gcc3/gcc/cp/decl.c:17817
#1  0x0000000000cd203a in maybe_add_lambda_conv_op (
    type=<record_type 0x7ffff66b7f18 ._anon_4>)
    at /home/rguenther/src/gcc3/gcc/cp/lambda.c:1294
#2  0x0000000000e6d868 in tsubst_lambda_expr (t=<lambda_expr 0x7ffff66a68c0>, 
    args=<tree_vec 0x7ffff668bc00>, complain=3, 
    in_decl=<function_decl 0x7ffff6697500 operator()>)
    at /home/rguenther/src/gcc3/gcc/cp/pt.c:19568
#3  0x0000000000e74cab in tsubst_copy_and_build (
    t=<lambda_expr 0x7ffff66a68c0>, args=<tree_vec 0x7ffff668bc00>, 
    complain=0, in_decl=<tree 0x0>, function_p=false, 
    integral_constant_expression_p=false)
    at /home/rguenther/src/gcc3/gcc/cp/pt.c:20992
#4  0x0000000000e58d68 in tsubst (t=<decltype_type 0x7ffff66933f0>, 
    args=<tree_vec 0x7ffff668bc00>, complain=0, in_decl=<tree 0x0>)
    at /home/rguenther/src/gcc3/gcc/cp/pt.c:16159
#5  0x0000000000c94947 in dump_template_bindings (
    pp=0x406eb80 <actual_pretty_printer>, parms=<tree 0x0>, 
    args=<tree_vec 0x7ffff668bc00>, typenames=0x7ffff66abfa0 = {...})
    at /home/rguenther/src/gcc3/gcc/cp/error.c:482
#6  0x0000000000c9ad5d in dump_substitution (
    pp=0x406eb80 <actual_pretty_printer>, 
    t=<template_decl 0x7ffff66a7280 spam>, 
    template_parms=<tree_list 0x7ffff668de88>, 
    template_args=<tree_vec 0x7ffff668bc00>, flags=4)
    at /home/rguenther/src/gcc3/gcc/cp/error.c:1638
#7  0x0000000000c9c906 in dump_function_decl (
    pp=0x406eb80 <actual_pretty_printer>, 
    t=<template_decl 0x7ffff66a7280 spam>, flags=4)
    at /home/rguenther/src/gcc3/gcc/cp/error.c:1796
#8  0x0000000000c99c3b in dump_decl (pp=0x406eb80 <actual_pretty_printer>, 
    t=<function_decl 0x7ffff66b0700 spam>, flags=4)
    at /home/rguenther/src/gcc3/gcc/cp/error.c:1369
#9  0x0000000000ca3340 in decl_as_string (
    decl=<function_decl 0x7ffff66b0700 spam>, flags=4)
    at /home/rguenther/src/gcc3/gcc/cp/error.c:3117
#10 0x0000000000ca3418 in lang_decl_name (
    decl=<function_decl 0x7ffff66b0700 spam>, v=2, translate=false)
    at /home/rguenther/src/gcc3/gcc/cp/error.c:3151
#11 0x0000000000efabc1 in cxx_printable_name_internal (
    decl=<function_decl 0x7ffff66b0700 spam>, v=2, translate=false)
    at /home/rguenther/src/gcc3/gcc/cp/tree.c:2678
#12 0x0000000000efac61 in cxx_printable_name (
    decl=<function_decl 0x7ffff66b0700 spam>, v=2)
    at /home/rguenther/src/gcc3/gcc/cp/tree.c:2687
#13 0x00000000017ad599 in announce_function (
    decl=<function_decl 0x7ffff66b0700 spam>)
    at /home/rguenther/src/gcc3/gcc/toplev.c:234
#14 0x0000000000c6496f in start_preparsed_function (
    decl1=<function_decl 0x7ffff66b0700 spam>, attrs=<tree 0x0>, flags=1)
    at /home/rguenther/src/gcc3/gcc/cp/decl.c:16905

so it looks like some diagnostics affect current_function_decl, the key
is omitting -quiet from the command-line that's usually added by the driver.