https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127457
Bug ID: 127457
Summary: Wrong wide string literal alignment
Product: gcc
Version: 16.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: lnicoara at thinkoid dot org
Target Milestone: ---
GCC merges a wide string literal with an earlier narrow string literal
having the same byte representation, but does not preserve the alignment
required.
Test case:
❯ gcc --version | head -n 1; cat t.c; gcc -S t.c && cat t.s | head -n 10; gcc
-O0 t.c && ./a.out
gcc (GCC) 16.2.1 20260810
#include <stdio.h>
#include <stdint.h>
#include <wchar.h>
void f(const void*);
int main(void) {
f("x");
f("\0\0\0");
f(L"");
}
void f(const void* p)
{
printf ("alignment=%zu remainder=%zu\n",
alignof(wchar_t), (size_t)((uintptr_t)p % alignof(wchar_t)));
}
.file "t.c"
.text
.section .rodata
.LC0:
.string "x"
.LC1:
.base64 "AAAAAA=="
.text
.globl main
.type main, @function
alignment=4 remainder=0
alignment=4 remainder=2
alignment=4 remainder=2
