* lisp.h (union Lisp_Object): Explicitly declare signedness of
bit-field.
(XINT): Remove variant for EXPLICIT_SIGN_EXTEND.
* m/alpha.h (EXPLICIT_SIGN_EXTEND): Don't define.
* m/amdx86-64.h (EXPLICIT_SIGN_EXTEND): Likewise.
* m/ia64.h (EXPLICIT_SIGN_EXTEND): Likewise.
* m/ibms390.h (EXPLICIT_SIGN_EXTEND): Likewise.
* m/ibms390x.h (EXPLICIT_SIGN_EXTEND): Likewise.
* m/iris4d.h (EXPLICIT_SIGN_EXTEND): Likewise.
* m/m68k.h (EXPLICIT_SIGN_EXTEND): Likewise.
* m/sparc.h (EXPLICIT_SIGN_EXTEND): Likewise.
* m/template.h (EXPLICIT_SIGN_EXTEND): Likewise.
* m/hp800.h: Remove file.
* m/mips.h: Remove file.

* lisp.h (union Lisp_Object): Explicitly declare signedness of
bit-field.
(XINT): Remove variant for EXPLICIT_SIGN_EXTEND.
* m/alpha.h (EXPLICIT_SIGN_EXTEND): Don't define.
* m/amdx86-64.h (EXPLICIT_SIGN_EXTEND): Likewise.
* m/ia64.h (EXPLICIT_SIGN_EXTEND): Likewise.
* m/ibms390.h (EXPLICIT_SIGN_EXTEND): Likewise.
* m/ibms390x.h (EXPLICIT_SIGN_EXTEND): Likewise.
* m/iris4d.h (EXPLICIT_SIGN_EXTEND): Likewise.
* m/m68k.h (EXPLICIT_SIGN_EXTEND): Likewise.
* m/sparc.h (EXPLICIT_SIGN_EXTEND): Likewise.
* m/template.h (EXPLICIT_SIGN_EXTEND): Likewise.
* m/hp800.h: Remove file.
* m/mips.h: Remove file.

* CPP-DEFINES (EXPLICIT_SIGN_EXTEND): Remove.

* m/alpha.h: Don't define/undef WORDS_BIG_ENDIAN.
* m/amdx86-64.h: Likewise.
* m/arm.h: Likewise.
* m/hp800.h: Likewise.
* m/ia64.h: Likewise.
* m/ibmrs6000.h: Likewise.
* m/ibms390.h: Likewise.
* m/intel386.h: Likewise.
* m/iris4d.h: Likewise.
* m/m68k.h: Likewise.
* m/macppc.h: Likewise.
* m/mips.h: Likewise.
* m/sh3.h: Likewise.
* m/sparc.h: Likewise.
* m/template.h: Likewise.
* m/vax.h: Likewise.
* m/xtensa.h: Likewise.
* fringe.c (init_fringe_bitmap): Test WORDS_BIGENDIAN instead of
WORDS_BIG_ENDIAN.
* lisp.h: Likewise.
* md5.c: Likewise.
* sound.c (le2hl, le2hs, be2hl, be2hs): Likewise.

* CPP-DEFINES (WORDS_BIG_ENDIAN): Remove.

* configure.in: Add AC_C_BIGENDIAN.

* src/mem-limits.h: Remove !emacs and _LIBC conditional code.
(start_of_data): Merge into start_of_data function.
* src/sysdep.c (start_of_text): Remove.  Move simplified versions of
it in the only users: src/unexaix.c and unexec.c.
(read_input_waiting): Remove local declaration of quit_char.
(start, etext): Remove declarations.
(start_of_data): Merge with the version in mem-limits.h and move
to vm-limits.c.
* src/vm-limit.c (start_of_data): Merged and simplified version of the
code formerly in mem-limits.h and sysdep.c.
* src/unexec.c (start): New declaration, moved from sysdep.c.
(start_of_text): Simplified version of the code formerly in sysdep.c.
* unexaix.c (start_of_text): Simplified version of the code
formerly in sysdep.c.
* src/m/alpha.h (HAVE_TEXT_START): Remove.
(TEXT_START): Move ...
* src/unexalpha.c (TEXT_START): ... here.
* src/s/hpux10-20.h (TEXT_START): Remove.
* src/s/darwin.h (TEXT_START):
* src/m/mips.h (TEXT_START):
* src/m/macppc.h (HAVE_TEXT_START):
* src/m/m68k.h (TEXT_START):
* src/m/iris4d.h (TEXT_START):
* src/m/intel386.h (TEXT_START):
* src/m/ibmrs6000.h (TEXT_START):
* src/m/ia64.h (HAVE_TEXT_START):
* src/s/msdos.h (TEXT_START): Likewise.

* fns.c (concat2, concat3, nconc2):
* eval.c (apply1, call1, call2, call3, call4, call5, call6)
(call7): Remove NO_ARG_ARRAY usage, assume it's always true.
* m/xtensa.h (NO_ARG_ARRAY):
* m/template.h (NO_ARG_ARRAY):
* m/sparc.h (NO_ARG_ARRAY):
* m/sh3.h (NO_ARG_ARRAY):
* m/mips.h (NO_ARG_ARRAY):
* m/macppc.h (NO_ARG_ARRAY):
* m/iris4d.h (NO_ARG_ARRAY):
* m/intel386.h (NO_ARG_ARRAY):
* m/ibms390x.h (NO_ARG_ARRAY):
* m/ibms390.h (NO_ARG_ARRAY):
* m/ibmrs6000.h (NO_ARG_ARRAY):
* m/ia64.h (NO_ARG_ARRAY):
* m/hp800.h (NO_ARG_ARRAY):
* m/arm.h (NO_ARG_ARRAY):
* m/amdx86-64.h (NO_ARG_ARRAY):
* m/alpha.h (NO_ARG_ARRAY): Remove definition.

* m/mips.h: Remove DATA_START.  Suggested by Dan Nicolaescu.

* m/alpha.h: Don't define DATA_START on NetBSD (Bug#4629).