https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125226
--- Comment #3 from GCC Commits ---
The master branch has been updated by H.J. Lu :
https://gcc.gnu.org/g:fa69425e64d9850b0e64a53b15545bdcdbedcd69
commit r17-1597-gfa69425e64d9850b0e64a53b15545bdcdbedcd69
Author: H.J. Lu
Date: Fri May 8 12:20:02 2026 +0800
SSP: Check UINTPTR_TYPE to get uintptr_t type
default_stack_protect_guard calls
lang_hooks.types.type_for_mode (ptr_mode, 1);
to get an integer type for __stack_chk_guard which 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. On 32-bit Darwin, 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 â__stack_chk_guardâ; have
âlong unsigned intâ
1 | __UINTPTR_TYPE__ __stack_chk_guard = 0x1000;
| ^
cc1: note: previous declaration of â__stack_chk_guardâ with type
âunsigned intâ
$
since lang_hooks.types.type_for_mode returns unsigned int while Darwin's
uintptr_t is unsigned long int. Update default_stack_protect_guard to
call unsigned_integer_tree_node_for_type with UINTPTR_TYPE to get unsigned
integer type for uintptr_t instead.
gcc/
PR c/125226
* targhooks.cc (default_stack_protect_guard): If UINTPTR_TYPE
isn't NULL, call unsigned_integer_tree_node_for_type with
UINTPTR_TYPE to get unsigned integer type for uintptr_t.
* tree.cc (unsigned_integer_tree_node_for_type): New function.
(build_common_tree_nodes): Call unsigned_integer_tree_node with
SIZE_TYPE to get unsigned integer type for size_t.
* tree.h (unsigned_integer_tree_node_for_type): New prototype.
Signed-off-by: H.J. Lu
