https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113977
Bug ID: 113977
Summary: debug info for alignment of structure is unspecified
Product: gcc
Version: 13.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: debug
Assignee: unassigned at gcc dot gnu.org
Reporter: tsqurt at outlook dot com
Target Milestone: ---
Created attachment 57454
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=57454&action=edit
src.c
GCC does not generate complete debug information for my C code when generating
debug information. The alignment requirement for my structures is 1, but the
debugger believes their alignment requirement is 8 (which is likely inherited
from the default structure alignment requirement on the platform).
I'm using the AMD64 instruction set, and the operating system is Ubuntu 20.04.6
LTS on Windows Subsystem for Linux.
To reproduce this issue, follow these steps with the attached code:
gcc src.c -gdwarf-5 -o a.out && gdb a.out
(gdb) b 13
Breakpoint 1 at 0x1170: file src.c, line 13.
(gdb) run
Starting program: a.out
Breakpoint 1, main () at src.c:13
13 return 0;
(gdb) expr z[0]._[0] = 1
(gdb) expr y[0]._[0] = 1
(gdb) expr x[0]._[0] = 1
gdb command line:1:1: error: alignment of array elements is greater than
element size
Compilation failed.
(gdb)
GDB reports that the alignment requirement for these structures is 8, but it is
1.
