[patch, libgfortran, power-ieee128] Add multiple defaults for GFORTRAN_CONVERT_UNIT

[Thomas Koenig]

Hello world,

with this patch, it is now possible to specify both the
endianness and the REAL(KIND=16) format using the
environment variable GFORTRAN_CONVERT_UNIT.  The following
now works:

koenig@gcc-fortran:~/Tst$ cat write_env.f90
program main
   real(kind=16) :: x
   character (len=30) :: conv
   x = 1/3._16
   open 
(10,file="out.dat",status="replace",access="stream",form="unformatted")
   inquire(10,convert=conv)
   print *,conv
   write (10) 1/3._16
end program main
tkoenig@gcc-fortran:~/Tst$ gfortran -g -static-libgfortran write_env.f90
tkoenig@gcc-fortran:~/Tst$ GFORTRAN_CONVERT_UNIT="little_endian;r16_ibm" 
&& ./a.out
  LITTLE_ENDIAN,R16_IBM
tkoenig@gcc-fortran:~/Tst$ 
GFORTRAN_CONVERT_UNIT="little_endian;r16_ieee" && ./a.out
  LITTLE_ENDIAN,R16_IEEE
tkoenig@gcc-fortran:~/Tst$ GFORTRAN_CONVERT_UNIT="big_endian;r16_ieee" 
&& ./a.out
  BIG_ENDIAN,R16_IEEE
tkoenig@gcc-fortran:~/Tst$ GFORTRAN_CONVERT_UNIT="big_endian;r16_ibm" && 
./a.out
  BIG_ENDIAN,R16_IBM

Since the branch has been pushed to trunk, I don't think we need
it any more (or do we?), so OK for trunk?

Best regards

	Thomas

Allow for multiple defaults in endianness and r16 in GFORTRAN_CONVERT_UNIT.

With this patch, it is possible to specify multiple defaults inthe
GFORTRAN_CONVERT_UNIT environment variable so that, for example, R16_IEEE
and BIG_ENDIAN can be specified together.


libgfortran/ChangeLog:

	* runtime/environ.c: Allow for multiple default values so that
	separate default specifications for IBM long double format and
	endianness are possible.

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