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	* regex.c [_LIBC] (re_comp, re_exec): Define these, but weakly.

length of exactn as character, and don't use length of bitmap of
charset as bitmap.

(re_match_2_internal): Work around compiler bug.

(re_error_msgid): Mark strings with that, to ease message catalog creation.

Do not test for backtracking--do the same thing with or without.

(_GNU_SOURCE): Undef before defining.

(re_max_failures): Initialize to just 20000.

Don't define if already defined.
(regex_compile): Use RE_TRANSLATE_TYPE for `translate'.
(compile_range, re_search_2, re_match_2_internal, bcmp_translate)
(regcomp): Use RE_TRANSLATE_TYPE for `translate'.

for the match position when we adjust RANGE.

register values if POSIX backtracking is turned off.
(NUM_FAILURE_ITEMS): Value is 0 if no POSIX backtracking.

other way of getting a bcopy and a bzero.

(RESET_FAIL_STACK): New macro.
(re_compile_fastmap): Use RESET_FAIL_STACK, not REGEX_FREE_STACK
directly.

(re_match_failures): Reduce the larger value to 200000,
and use whenever if MATCH_MAY_ALLOCATE.
(MATCH_MAY_ALLOCATE): Don't consider REL_ALLOC when deciding
whether to undef this.

(fail_stack_elt_t): Use that union.
(PUSH_PATTERN_OP, PUSH_FAILURE_POINTER, PUSH_FAILURE_INT)
(POP_FAILURE_POINTER, POP_FAILURE_INT): Corresponding changes.
(re_compile_fastmap): Corresponding changes.
(PUSH_FAILURE_ELT): New macro.
(FAIL_STACK_TOP): Macro deleted.
(WIDE_INT): Macro deleted.
(PUSH_FAILURE_POINT): Use PUSH_FAILURE_ELT.
(POP_FAILURE_ELT): New macro.
(POP_FAILURE_POINT): Use POP_FAILURE_ELT.

(WIDE_INT): Defined (two alternate definitions).

(C_ALLOCA): Undef it, if __GNUC__.

(REGEX_ALLOCATE_STACK, REGEX_REALLOCATE_STACK)
(REGEX_FREE_STACK): New macros.
(INIT_FAIL_STACK, DOUBLE_FAIL_STACK, FREE_VARIABLES): Use them.
(re_max_failures) [REL_ALLOC]: Alternative larger initial value.
(re_compile_fastmap): Use REGEX_FREE_STACK.
(re_match_2_internal): Always call FREE_VARIABLES before returning.
Always init regstart, old_regstart, etc. whenever MATCH_MAY_ALLOCATE
is defined.
(FREE_VARIABLES) [REL_ALLOC]: Define non-trivially.

(PUSH_FAILURE_ITEM, POP_FAILURE_ITEM): Macros deleted.
(PUSH_FAILURE_INT, POP_FAILURE_INT): New macros.
(PUSH_FAILURE_POINTER, POP_FAILURE_POINTER): New macros.

(re_match_2_internal): Rename label `succeed' to `succeed_label'.

instead of using trailing `else' -- otherwise, gcc -Wall complains
of `empty body in an else-statement'.

(re_compile_fastmap, re_match_2_internal): Use that macro instead of testing
SWITCH_ENUM_BUG.

Set set_regs_matched_done to 1.
(re_match_2_internal): New local var set_regs_matched_done.
Set it to 0 when appropriate.
(POP_FAILURE_POINT): Set set_regs_matched_done to 0.

(re_match_2_internal, case duplicate): Call SET_REGS_MATCHED.

((char *) -1).  The latter got a warning on IRIX64.

(NULL): No need to #undef this anymore; Emacs uses NILP now.

(re_error_msgid): Renamed from `re_error_msg', for consistency
with other source files that declare arrays of message ids.
Identifiers ending in `msgid' are special to to some prototype
message-extracting utilities.
Make "Success" be the 0th entry, so it can be extracted too.
(re_comp): Replace "Memory exhausted" with
re_error_msgid[REG_ESPACE], to aid message consistency.