-flto=full

dpkg -c:

-rwxr-xr-x root/root      446K 2025-02-19 01:56 ./usr/bin/innotop
-rwxr-xr-x root/root      110K 2025-02-19 01:56 ./usr/bin/mariadb-access
-rwxr-xr-x root/root      4.9M 2025-02-19 01:56 ./usr/bin/mariadb-admin
-rwxr-xr-x root/root      5.2M 2025-02-19 01:56 ./usr/bin/mariadb-binlog
-rwxr-xr-x root/root      4.6M 2025-02-19 01:56 ./usr/bin/mariadb-conv
-rwxr-xr-x root/root      4.2K 2025-02-19 01:56 ./usr/bin/mariadb-convert-table-format
-rwxr-xr-x root/root      5.0M 2025-02-19 01:56 ./usr/bin/mariadb-dump
-rwxr-xr-x root/root      8.1K 2025-02-19 01:56 ./usr/bin/mariadb-dumpslow
-rwxr-xr-x root/root      3.3K 2025-02-19 01:56 ./usr/bin/mariadb-find-rows
-rwxr-xr-x root/root      1.3K 2025-02-19 01:56 ./usr/bin/mariadb-fix-extensions
-rwxr-xr-x root/root       35K 2025-02-19 01:56 ./usr/bin/mariadb-hotcopy
-rwxr-xr-x root/root      4.9M 2025-02-19 01:56 ./usr/bin/mariadb-import
-rwxr-xr-x root/root      4.6M 2025-02-19 01:56 ./usr/bin/mariadb-plugin
-rwxr-xr-x root/root       50K 2025-02-19 01:56 ./usr/bin/mariadb-report
-rwxr-xr-x root/root       14K 2025-02-19 01:56 ./usr/bin/mariadb-secure-installation
-rwxr-xr-x root/root       18K 2025-02-19 01:56 ./usr/bin/mariadb-setpermission
-rwxr-xr-x root/root      4.9M 2025-02-19 01:56 ./usr/bin/mariadb-show
-rwxr-xr-x root/root      4.9M 2025-02-19 01:56 ./usr/bin/mariadb-slap
-rwxr-xr-x root/root      4.6M 2025-02-19 01:56 ./usr/bin/mariadb-tzinfo-to-sql
-rwxr-xr-x root/root      4.6M 2025-02-19 01:56 ./usr/bin/mariadb-waitpid
-rwxr-xr-x root/root      1.5K 2025-02-19 01:56 ./usr/bin/msql2mysql
-rwxr-xr-x root/root       72K 2025-02-19 01:56 ./usr/bin/mytop
-rwxr-xr-x root/root      4.8M 2025-02-19 01:56 ./usr/bin/perror
-rwxr-xr-x root/root      4.5M 2025-02-19 01:56 ./usr/bin/replace
-rwxr-xr-x root/root      4.6M 2025-02-19 01:56 ./usr/bin/resolve_stack_dump

l builddir/client:

-rwxr-xr-x  1 nabijaczleweli users   5.2M 04-12 19:43 mariadb
-rwxr-xr-x  1 nabijaczleweli users 739.3k 04-12 19:43 mariadb-admin
-rwxr-xr-x  1 nabijaczleweli users     5M 04-12 19:43 mariadb-binlog
-rwxr-xr-x  1 nabijaczleweli users   4.8M 04-12 19:43 mariadb-check
-rwxr-xr-x  1 nabijaczleweli users   4.5M 04-12 19:43 mariadb-conv
-rwxr-xr-x  1 nabijaczleweli users   4.9M 04-12 19:43 mariadb-dump
-rwxr-xr-x  1 nabijaczleweli users 856.6k 04-12 19:43 mariadb-import
-rwxr-xr-x  1 nabijaczleweli users   417k 04-12 19:43 mariadb-plugin
-rwxr-xr-x  1 nabijaczleweli users 730.3k 04-12 19:43 mariadb-show
-rwxr-xr-x  1 nabijaczleweli users   749k 04-12 19:43 mariadb-slap
-rwxr-xr-x  1 nabijaczleweli users   5.4M 04-12 19:43 mariadb-test
-rwxr-xr-x  1 nabijaczleweli users 897.5k 04-12 19:43 mariadb-upgrade

Before accd'g to https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1053738#25:

± ll ./builddir/storage/maria/aria_*
-rwxr-xr-x 1 otto otto 14M Apr 11 20:16 ./builddir/storage/maria/aria_chk*
-rwxr-xr-x 1 otto otto 13M Apr 11 20:16 ./builddir/storage/maria/aria_dump_log*
-rwxr-xr-x 1 otto otto 13M Apr 11 20:16 ./builddir/storage/maria/aria_ftdump*
-rwxr-xr-x 1 otto otto 13M Apr 11 20:16 ./builddir/storage/maria/aria_pack*
-rwxr-xr-x 1 otto otto 14M Apr 11 20:16 ./builddir/storage/maria/aria_read_log*
-rwxr-xr-x 1 otto otto 12M Apr 11 20:16 ./builddir/storage/maria/aria_s3_copy*

$ l ./builddir/storage/maria/aria_*
-rwxr-xr-x 1 nabijaczleweli users   5.2M 04-12 19:43 ./builddir/storage/maria/aria_chk
-rwxr-xr-x 1 nabijaczleweli users 472.4k 04-12 19:43 ./builddir/storage/maria/aria_dump_log
-rwxr-xr-x 1 nabijaczleweli users   4.8M 04-12 19:43 ./builddir/storage/maria/aria_ftdump
-rwxr-xr-x 1 nabijaczleweli users   4.9M 04-12 19:43 ./builddir/storage/maria/aria_pack
-rwxr-xr-x 1 nabijaczleweli users   5.1M 04-12 19:43 ./builddir/storage/maria/aria_read_log
-rwxr-xr-x 1 nabijaczleweli users 498.3k 04-12 19:43 ./builddir/storage/maria/aria_s3_copy

(numbers from building on bookworm)