[Bug libfortran/83097] Use __BYTE_ORDER__ instead of runtime test

[jb at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83097

--- Comment #2 from Janne Blomqvist <jb at gcc dot gnu.org> ---
Author: jb
Date: Wed Nov 22 19:19:13 2017
New Revision: 255072

URL: https://gcc.gnu.org/viewcvs?rev=255072&root=gcc&view=rev
Log:
PR 83097 Use __BYTE_ORDER__ predefined macro instead of runtime check

By using the __BYTE_ORDER__ predefined macro we don't need the
determine_endianness function anymore.

Regtested on x86_64-pc-linux-gnu.

libgfortran/ChangeLog:

2017-11-22  Janne Blomqvist  <jb@gcc.gnu.org>

        PR libfortran/83097
        * io/inquire.c (inquire_via_unit): Use __BYTE_ORDER__ predefined
        macro.
        * io/open.c (st_open): Likewise.
        * io/transfer.c (data_transfer_init): Likewise.
        * io/write.c (btoa_big): Likewise.
        (otoa_big): Likewise.
        (ztoa_big): Likewise.
        * libgfortran.h (big_endian): Remove variable.
        (GFOR_POINTER_TO_L1): Use __BYTE_ORDER__ macro.
        * runtime/main.c (determine_endianness): Remove function.
        (init): Remove call to determine_endianness.
        * runtime/minimal.c: Remove setting big_endian variable.

Modified:
    trunk/libgfortran/ChangeLog
    trunk/libgfortran/io/inquire.c
    trunk/libgfortran/io/open.c
    trunk/libgfortran/io/transfer.c
    trunk/libgfortran/io/write.c
    trunk/libgfortran/libgfortran.h
    trunk/libgfortran/runtime/main.c
    trunk/libgfortran/runtime/minimal.c