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regex: stop using alloca

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It syncs with gnulib version 87ed1f9c4.  No functional changes is
expected.

Checked on x86_64-linux-gnu.
This commit is contained in:
Adhemerval Zanella 2018-07-16 17:39:23 -03:00
parent f3e5c7262e
commit 36c604ed36
1 changed files with 0 additions and 19 deletions
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19
posix/regex_internal.h
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@ -444,25 +444,6 @@ typedef struct re_dfa_t re_dfa_t;
#define re_string_skip_bytes(pstr,idx) ((pstr)->cur_idx += (idx))
#define re_string_set_index(pstr,idx) ((pstr)->cur_idx = (idx))
#if defined _LIBC || HAVE_ALLOCA
# include <alloca.h>
#endif
#ifndef _LIBC
# if HAVE_ALLOCA
/* The OS usually guarantees only one guard page at the bottom of the stack,
and a page size can be as small as 4096 bytes. So we cannot safely
allocate anything larger than 4096 bytes. Also care for the possibility
of a few compiler-allocated temporary stack slots. */
# define __libc_use_alloca(n) ((n) < 4032)
# else
/* alloca is implemented with malloc, so just use malloc. */
# define __libc_use_alloca(n) 0
# undef alloca
# define alloca(n) malloc (n)
# endif
#endif
#ifdef _LIBC
# define MALLOC_0_IS_NONNULL 1
#elif !defined MALLOC_0_IS_NONNULL