[Bug libfortran/52539] I/O: Wrong result for UTF-8/UCS-4 list-directed and namelist read and nml write

["dominiq at lps dot ens.fr" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52539

--- Comment #24 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
On powerpc-apple-darwin9 with the patch in comment 20, the test
gfortran.dg/namelist_utf8.f90 fails. The following modified test

[karma] f90/bug% cat > pr52539_2_db.f90
! { dg-do run }
! PR52539 UTF-8 support for namelist read and write

character(len=10, kind=4) :: str, str2
character(len=25, kind=4) :: str3

namelist /nml/ str

str = 4_'1a'//char (int (z'4F60'),4)     &
      //char (int (z'597D'), 4)//4_'b'

open(6, encoding='utf-8')
open(99, encoding='utf-8',form='formatted')
write(99, '(3a)') '&nml str = "', str, '" /'
write(99, '(a)') str
rewind(99)

str = 4_'XXXX'
str2 = 4_'YYYY'
read(99,nml=nml)
read(99, *) str2
print *, "'", str, "'  '", str2, "'"
!if (str2 /= str) call abort
rewind(99)

read(99,'(A)') str3
print *, "'", str, "'  '", str3, "'"
if (str3 /= 4_'&nml str = "' // str // 4_'" /') call abort
read(99,'(A)') str3
if (str3 /= str) call abort

close(99, status='delete')
end

gives

 '??????????????????X      '  '1aÃÂÂÃÂÂb '
 '??????????????????X      '  '&nml str = "1aäåb     " /'

Program aborted. Backtrace:
#0  0xeee9b
Abort

while the file fort.99 is

&nml str = "1aäåb     " /
1aäåb