https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125226
Bug ID: 125226
Summary: error: conflicting types for ‘__stack_chk_guard’; have
‘long unsigned int’
Product: gcc
Version: 17.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: hjl.tools at gmail dot com
Target Milestone: ---
Target: x86_64-darwin
default_stack_protect_guard calls
lang_hooks.types.type_for_mode (ptr_mode, 1);
to get an integer type for __stack_chk_guard when it is declared as
a global symbol of type uintptr_t. For 32-bit systems, uintptr_t may
be either unsigned int or unsigned long int. Since uintptr_t for 32-bit
Darwin is 32-bit unsigned long int, we get
$ cat /tmp/x.c
__UINTPTR_TYPE__ __stack_chk_guard = 0x1000;
$ ./xgcc -B./ -S /tmp/x.c -m32
/tmp/x.c:1:18: error: conflicting types for ‘__stack_chk_guard’; have ‘long
unsigned int’
1 | __UINTPTR_TYPE__ __stack_chk_guard = 0x1000;
| ^~~~~~~~~~~~~~~~~
cc1: note: previous declaration of ‘__stack_chk_guard’ with type ‘unsigned int’
$
