> On Jul 17, 2018, at 9:36 AM, Richard Biener <richard.guent...@gmail.com>
> wrote:
>
> On Tue, Jul 17, 2018 at 3:08 PM Paul Koning <paulkon...@comcast.net> wrote:
>>
>>
>>> On Jul 17, 2018, at 5:46 AM, Richard Biener <richard.guent...@gmail.com>
>>> wrote:
>>>
>>>> ...
>>>
>>> There is not enough information for anyone to help you without
>>> reproducing the issue which is maybe too much to ask for ;)
>>>
>>> Can you debug_tree () the offending decl in gdb?
>>
>> Yes, here it is. I don't know anything about debugging in this area, so
>> tools like debug_tree are good to learn about. How would I interpret its
>> output?
>>
>> pkoning:gcc pkoning$ lldb ./cc1plus -- new_opa.ii -fno-implicit-templates
>> -Wall -Wextra -Wwrite-strings -Wcast-qual -Wabi
>> -fdiagnostics-show-location=once -frandom-seed=new_opa.lo -g -O2 -std=gnu++1z
>> (lldb) target create "./cc1plus"
>> Current executable set to './cc1plus' (x86_64).
>> ...
>> Process 10880 stopped
>> * thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1
>> frame #0: 0x0000000100c21378 cc1plus`internal_error(gmsgid="in %s, at
>> %s:%d") at diagnostic.c:1441 [opt]
>> 1438 internal_error (const char *gmsgid, ...)
>> 1439 {
>> 1440 va_list ap;
>> -> 1441 va_start (ap, gmsgid);
>> 1442 rich_location richloc (line_table, input_location);
>> 1443 diagnostic_impl (&richloc, -1, gmsgid, &ap, DK_ICE);
>> 1444 va_end (ap);
>> Target 0: (cc1plus) stopped.
>> (lldb) frame sel 2
>> frame #2: 0x0000000100074b36
>> cc1plus`import_export_decl(decl=0x000000014269c750) at decl2.c:2877 [opt]
>> 2874 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl));
>> 2875 /* Any code that creates entities with TREE_PUBLIC cleared should
>> 2876 also set DECL_INTERFACE_KNOWN. */
>> -> 2877 gcc_assert (TREE_PUBLIC (decl));
>> 2878 if (TREE_CODE (decl) == FUNCTION_DECL)
>> 2879 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
>> 2880 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
>> (lldb) call debug_tree(decl)
>> <var_decl 0x14269c750 value
>> type <boolean_type 0x1426aa5e8 bool readonly unsigned type_6 QI
>> size <integer_cst 0x142502768 constant 8>
>> unit-size <integer_cst 0x142502780 constant 1>
>> align:8 warn_if_not_align:0 symtab:150 alias-set -1 canonical-type
>> 0x1426aa5e8 precision:1 min <integer_cst 0x1425029d8 0> max <integer_cst
>> 0x142502a08 1>>
>> readonly constant used static tree_1 tree_2 tree_3 unsigned nonlocal
>> in_system_header read decl_1 QI
>> /Users/pkoning/Documents/svn/buildpdp/pdp11-aout/libstdc++-v3/include/type_traits:59:28
>> size <integer_cst 0x142502768 8> unit-size <integer_cst 0x142502780 1>
>> align:8 warn_if_not_align:0 context <record_type 0x1426a7e70
>> integral_constant> initial <integer_cst 0x1425029d8 0>
>> template-info 0x1426a64e0 chain <function_decl 0x1426a0600 __conv_op >>
>> (lldb)
>
> lldb? eh ... ;)
>
> anyhow, this is
>
> namespace std
> {
>
> # 56
> "/Users/pkoning/Documents/svn/buildpdp/pdp11-aout/libstdc++-v3/include/type_traits"
> 3
> template<typename _Tp, _Tp __v>
> struct integral_constant
> {
> static constexpr _Tp value = __v;
> ^^^
>
> which should have TREE_PUBLIC set. My next step would be to watch how
> this flag changes (if it does...)
>
> break at ggc-page.c:1442 (the return stmt of ggc_internal_alloc)
> conditional on result == 0x14269c750
> and then watch *&the-decl->base.public_flag printing said flag when
> the watchpoint hits
> (because you're watching the whole integer containing the bitfield bit).
>
> If that doesn't go anywhere try reducing the source file using creduce
> or by other means.
>
> Maybe look at reset_decl_linkage () and visibility support in general.
I trimmed the file a bit.
Managed to find where public_flag is cleared. It is in cp/expr.c
maybe_commonize_var, line 5619, here:
else
{
/* While for initialized variables, we must use internal
linkage -- which means that multiple copies will not
be merged. */
TREE_PUBLIC (decl) = 0;
DECL_COMMON (decl) = 0;
Could it be related to the fact that I have an a.out (rather than ELF) target?
paul
