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(METER_CODE, Bscan_buffer, Bread_char, Bset_mark):
Define only if needed.

n rather than nn, a way that does not involve shadowing.

to avoid gcc -Wbad-function-cast warning.

* deps.mk (emacs.o, unexaix.o, unexcw.o, unexcoff.o, unexelf.o):
(unexhp9k800.o, unexmacosx.o, unexsol.o, unexw32.o):
Depend on unexec.h.
* emacs.c [!defined CANNOT_DUMP]: Include unexec.h.
* unexaix.c, unexcoff.c, unexcw.c, unexelf.c, unexhp9k800.c:
* unexmacosx.c, unexsol.c, unexw32.c: Include unexec.h.

shadowing.

Rename locals to avoid shadowing.

warning when compiling print.c.

instead of using an uninitialized var.

(font_update_drivers, Ffont_get_glyphs, font_add_log):
Rename or move locals to avoid shadowing.

pointers to constants.

* lisp.h: ... to here, so that it can be checked.

to avoid gcc -Wbad-function-cast warning.

(Ftranslate_region_internal, Fformat):
Rename or remove local vars to avoid shadowing.

(Fuser_real_uid, Fuser_full_name): Remove unnecessary casts,
some of which prompt warnings from gcc -Wbad-function-cast.