illumos gate

$ lorder OBJ/i386-sunos5-gcc/macro.o
OBJ/i386-sunos5-gcc/macro.o OBJ/i386-sunos5-gcc/macro.o
0000002288 t _ZL16init_arch_macrosv
0000002706 t _ZL16init_mach_macrosv
0000009220 t _ZL24expand_value_with_daemonP5_NameP9_PropertyP7_String7BooleanS5_
OBJ/i386-sunos5-gcc/macro.o OBJ/i386-sunos5-gcc/macro.o
0000002288 t _ZL16init_arch_macrosv
0000002706 t _ZL16init_mach_macrosv
0000009220 t _ZL24expand_value_with_daemonP5_NameP9_PropertyP7_String7BooleanS5_
tsoome@beastie:/code/schilytools-code/schily-2021-07-29/sunpro/Make/lib/mksh/src$ env LC_ALL=C  lorder OBJ/i386-sunos5-gcc/macro.o
OBJ/i386-sunos5-gcc/macro.o OBJ/i386-sunos5-gcc/macro.o
OBJ/i386-sunos5-gcc/macro.o OBJ/i386-sunos5-gcc/macro.o
tsoome@beastie:/code/schilytools-code/schily-2021-07-29/sunpro/Make/lib/mksh/src$ 

replacing sequence a-z with [:lower:] will fix sed to use lower case chars. The issue about [a-z] sequence is, in et_EE locale, the collation sequence is .. r s z t u .. and this is the reason why we see those symbols.

char sequence versus charclass issue is about collation order and normally should be controlled by LC_COLLATE (unless LC_ALL is set). For some reason, sed does not seem to accept LC_COLLATE to set collation order for char sequence. However, setting LC_ALL does:

root@beastie:~# locale
LANG=et_EE.UTF-8
LC_CTYPE=et_EE.UTF-8
LC_NUMERIC="et_EE.UTF-8" 
LC_TIME="et_EE.UTF-8" 
LC_COLLATE="et_EE.UTF-8" 
LC_MONETARY="et_EE.UTF-8" 
LC_MESSAGES="et_EE.UTF-8" 
LC_ALL=et_EE.UTF-8
root@beastie:~# echo absztuv | sed 's/[a-z]//g'
tuv
root@beastie:~# echo absztuv | env LC_COLLATE=C sed 's/[a-z]//g'
tuv
root@beastie:~# echo absztuv | env LC_COLLATE=C.UTF-8 sed 's/[a-z]//g'
tuv
root@beastie:~# echo absztuv | env LC_ALL=C.UTF-8 sed 's/[a-z]//g'

root@beastie:~#

And testing with patched lorder:

tsoome@beastie:/code/schilytools-code/schily-2021-07-29/sunpro/Make/lib/mksh/src$ locale
LANG=et_EE.UTF-8
LC_CTYPE=et_EE.UTF-8
LC_NUMERIC="et_EE.UTF-8" 
LC_TIME="et_EE.UTF-8" 
LC_COLLATE="et_EE.UTF-8" 
LC_MONETARY="et_EE.UTF-8" 
LC_MESSAGES="et_EE.UTF-8" 
LC_ALL=et_EE.UTF-8
tsoome@beastie:/code/schilytools-code/schily-2021-07-29/sunpro/Make/lib/mksh/src$ lorder OBJ/i386-sunos5-gcc/macro.o 
OBJ/i386-sunos5-gcc/macro.o OBJ/i386-sunos5-gcc/macro.o
OBJ/i386-sunos5-gcc/macro.o OBJ/i386-sunos5-gcc/macro.o
tsoome@beastie:/code/schilytools-code/schily-2021-07-29/sunpro/Make/lib/mksh/src$