Re: obstack module has alignment issues on sparc? (Re: set_labels_identifiers_target -fsanitize=undefined error)

[Bruno Haible]

Sam James wrote:
> It appears that the obstack gnulib module is the culprit.

When I compile texinfo-7.1 in such a way that is uses the obstack facility
from glibc (via 'gl_cv_func_obstack=yes ../configure ...'), I see the same
bus error as in a build where the obstack facility comes from gnulib.

Therefore, if it is a bug in gnulib, it is also a bug in glibc.

But since obstack_alignment_mask is explicitly documented [1] as a means to
change the alignment, I wonder whether it is a bug at all?

[1] also says: "By default, this boundary is aligned so that the object can
hold any type of data." Needs to be investigated in more depth...

Bruno

[1] 
https://www.gnu.org/software/libc/manual/html_node/Obstacks-Data-Alignment.html