[Bug c++/106820] internal compiler error: in function_and_variable_visibility [for std::shared_ptr<data>{b,??} use via <memory> module]
markmigm at gmail dot com
gcc-bugzilla@gcc.gnu.org
Wed Sep 7 20:43:05 GMT 2022
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106820
--- Comment #4 from Mark Millard <markmigm at gmail dot com> ---
(In reply to Mark Millard from comment #3)
> . . .
> And in a debugger I see:
>
> (lldb) print node->decl->decl_with_vis.weak_flag
> (unsigned int) $2 = 1
> (lldb) print node->decl->decl_with_vis.comdat_flag
> (unsigned int) $3 = 0
> (lldb) print node->weakref
> (unsigned int) $4 = 0
> (lldb) print node->decl->decl_common.decl_flag_1
> (unsigned int) $5 = 0
>
> and:
>
> (lldb) call debug_tree(node->decl)
> <function_decl 0x9986ca00 __gthrw_pthread_mutex_unlock
> type <function_type 0x939e7e70
> type <integer_type 0x8cd415e8 int sizes-gimplified public type_6 SI
> size <integer_cst 0x8cd40258 constant 32>
> unit-size <integer_cst 0x8cd40270 constant 4>
> align:32 warn_if_not_align:0 symtab:0 alias-set -1
> canonical-type 0x8cd415e8 precision:32 min <integer_cst 0x8cd40210
> -2147483648> max <integer_cst 0x8cd40228 2147483647>
> pointer_to_this <pointer_type 0x8cd48a80> reference_to_this
> <reference_type 0x9bb63000>>
> SI size <integer_cst 0x8cd40258 32> unit-size <integer_cst
> 0x8cd40270 4>
> align:32 warn_if_not_align:0 symtab:0 alias-set -1 canonical-type
> 0x939e7f18
> arg-types <tree_list 0x9986d168 value <pointer_type 0x939e7a80>
> chain <tree_list 0x8cd2b938 value <void_type 0x8cd41f18 void>>>
> pointer_to_this <pointer_type 0x99870150>>
> addressable used static tree_3 weak in_system_header decl_5 decl_6 DI
> /usr/local/lib/gcc12/include/c++/aarch64-portbld-freebsd14.0/bits/gthr-
> default.h:121:1 align:32 warn_if_not_align:0 context <translation_unit_decl
> 0x8cd3e000 module_shared_ptr_alias_construction_failure.cpp>
> attributes <tree_list 0x9986d230
> purpose <identifier_node 0x939ca980 alias
> normal local bindings <0x0>>
> value <tree_list 0x9986d258
> value <string_cst 0x939c6d80 type <array_type 0x939e77e0>
> readonly constant static "pthread_mutex_unlock\000">>
> chain <tree_list 0x9986d280
> purpose <identifier_node 0x939ca9c0 weakref
> normal local bindings <0x0>>>>
> full-name "int __gthrw_pthread_mutex_unlock(pthread_mutex**)"
> module 1:/usr/local/lib/gcc12/include/c++/memory exported chain
> <function_decl 0x9986c900 __gthread_trigger>>
And, sure enough, __gthrw_pthread_mutex_unlock looks to involve "weak" via
https://github.com/gcc-mirror/gcc/blob/master/libgcc/gthr-posix.h having
in use:
# define __gthrw2(name,name2,type) \
static __typeof(type) name \
__attribute__ ((__weakref__(#name2), __copy__ (type))); \
__gthrw_pragma(weak type)
. . .
/* Typically, __gthrw_foo is a weak reference to symbol foo. */
#define __gthrw(name) __gthrw2(__gthrw_ ## name,name,name)
. . .
__gthrw(pthread_mutex_unlock)
There could be more examples of the type of issue but the build stops
at the first to fail the gcc_assert.
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