Hi,

sombok fails to build from source on arm64 when using glibc 2.43,
currently in experimental.

The issue is triggered by glibc 2.43 on arm64 enabling 2MB THP by
default:
https://sourceware.org/git/?p=glibc.git;a=commit;h=321e1fc73f53081d92ba357cdd48c56b79292020

The problem is however not architecture-specific. For example it can be
reproduced with glibc 2.42 on amd64 by building the package with the
GLIBC_TUNABLES environment variable set to glibc.malloc.hugetlb=2.

Successful build with glibc 2.42, currently in sid:
https://people.debian.org/~ema/glibc-2.43-rebuilds/output-2/sombok_arm64.build

Logs of a failed build with glibc 2.43 are here:
https://people.debian.org/~ema/glibc-2.43-rebuilds/output-1/sombok_arm64.build

Salient part:

FAIL: tests/01break.t
FAIL: tests/02hangul.t
FAIL: tests/03ns.t
FAIL: tests/05urgent.t
FAIL: tests/06context.t
FAIL: tests/07sea.t
FAIL: tests/09uri.t
FAIL: tests/11format.t
[...]
FAIL: tests/01break.t
=====================

linebreak_break_partial: Cannot allocate memory
linebreak_break_partial: Cannot allocate memory
[...]

Hi,

I found that the issue is that linebreak_southeastasian_flagbreak() can
change errno when calling th_wbrk() in libthai, which in turns call
malloc(). Then _break_partial() checks for errno just after that call to
linebreak_southeastasian_flagbreak(). It is not clear to me if it is
correct as the libthai source code doesn't mention setting errno.

Regards
Aurelien