[Bug fortran/23815] Add -byteswapio flag

["tkoenig at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>]

------- Comment #11 from tkoenig at gcc dot gnu dot org  2005-11-05 22:21 -------
OK, for the interface...

My suggestion would be to have three levels of supplying this value (ifort
has five or six :-)

First, an option to supply to the compiler.  This could be
-fconvert=big_endian
-fconvert=little_endian
-fconvert=native (the default)

and maybe, at a later date,
-fconvert=vax_d
-fconvert=ibm_360.

This would be valid for all the units.

With this option alone, it would not be possible to write a conversion
program, so we need something else.

This could be overridden by a CONVERT="BIG_ENDIAN" etc. in the OPEN statement.

This, in turn, could be overridden by environment variables in the format

GFORTRAN_CONVERT_BIG_ENDIAN=10,20,30,40
GFORTRAN_CONVERT_LITTLE_ENDIAN=11,21,31,41

Agreed?

It would probably best to implement the compiler swith as selecting a
library at runtime.  I'll leave that to a later date :-)

If anybody knows how to set an environment variable in a dejagnu
testcase, please tell :-)


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23815