3 # Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005,
4 # 2006 Free Software Foundation, Inc.
6 # This file is free software; the Free Software Foundation
7 # gives unlimited permission to copy and/or distribute it,
8 # with or without modifications, as long as this notice is preserved.
10 dnl Initially derived from code in GNU grep.
11 dnl Mostly written by Jim Meyering.
17 AC_ARG_WITH([included-regex],
18 [AC_HELP_STRING([--without-included-regex],
19 [don't compile regex; this is the default on
20 systems with recent-enough versions of the GNU C
21 Library (use with caution on other systems)])])
23 case $with_included_regex in #(
24 yes|no) ac_use_included_regex=$with_included_regex
27 # If the system regex support is good enough that it passes the
28 # following run test, then default to *not* using the included regex.c.
29 # If cross compiling, assume the test would fail and use the included
30 # regex.c. The first failing regular expression is from `Spencer ere
31 # test #75' in grep-2.3.
32 AC_CACHE_CHECK([for working re_compile_pattern],
33 [gl_cv_func_re_compile_pattern_working],
40 [[static struct re_pattern_buffer regex;
41 unsigned char folded_chars[UCHAR_MAX + 1];
44 struct re_registers regs;
45 re_set_syntax (RE_SYNTAX_POSIX_EGREP);
46 memset (®ex, 0, sizeof (regex));
47 for (i = 0; i <= UCHAR_MAX; i++)
49 regex.translate = folded_chars;
50 s = re_compile_pattern ("a[[:@:>@:]]b\n", 11, ®ex);
51 /* This should fail with _Invalid character class name_ error. */
55 /* This should succeed, but does not for e.g. glibc-2.1.3. */
56 memset (®ex, 0, sizeof (regex));
57 s = re_compile_pattern ("{1", 2, ®ex);
62 /* The following example is derived from a problem report
63 against gawk from Jorge Stolfi <stolfi@ic.unicamp.br>. */
64 memset (®ex, 0, sizeof (regex));
65 s = re_compile_pattern ("[an\371]*n", 7, ®ex);
69 /* This should match, but does not for e.g. glibc-2.2.1. */
70 if (re_match (®ex, "an", 2, 0, ®s) != 2)
73 memset (®ex, 0, sizeof (regex));
74 s = re_compile_pattern ("x", 1, ®ex);
78 /* The version of regex.c in e.g. GNU libc-2.2.93 did not
79 work with a negative RANGE argument. */
80 if (re_search (®ex, "wxy", 3, 2, -2, ®s) != 1)
83 /* The version of regex.c in older versions of gnulib
84 ignored RE_ICASE. Detect that problem too. */
85 memset (®ex, 0, sizeof (regex));
86 re_set_syntax (RE_SYNTAX_EMACS | RE_ICASE);
87 s = re_compile_pattern ("x", 1, ®ex);
91 if (re_search (®ex, "WXY", 3, 0, 3, ®s) < 0)
94 /* REG_STARTEND was added to glibc on 2004-01-15.
95 Reject older versions. */
99 /* Reject hosts whose regoff_t values are too narrow.
100 These include glibc 2.3.5 on hosts with 64-bit ptrdiff_t
102 if (sizeof (regoff_t) < sizeof (ptrdiff_t)
103 || sizeof (regoff_t) < sizeof (ssize_t))
107 [gl_cv_func_re_compile_pattern_working=yes],
108 [gl_cv_func_re_compile_pattern_working=no],
109 dnl When crosscompiling, assume it is not working.
110 [gl_cv_func_re_compile_pattern_working=no])])
111 case $gl_cv_func_re_compile_pattern_working in #(
112 yes) ac_use_included_regex=no;; #(
113 no) ac_use_included_regex=yes;;
116 *) AC_MSG_ERROR([Invalid value for --with-included-regex: $with_included_regex])
120 if test $ac_use_included_regex = yes; then
121 AC_DEFINE([_REGEX_LARGE_OFFSETS], 1,
122 [Define if you want regoff_t to be at least as wide POSIX requires.])
123 AC_DEFINE([re_syntax_options], [rpl_re_syntax_options],
124 [Define to rpl_re_syntax_options if the replacement should be used.])
125 AC_DEFINE([re_set_syntax], [rpl_re_set_syntax],
126 [Define to rpl_re_set_syntax if the replacement should be used.])
127 AC_DEFINE([re_compile_pattern], [rpl_re_compile_pattern],
128 [Define to rpl_re_compile_pattern if the replacement should be used.])
129 AC_DEFINE([re_compile_fastmap], [rpl_re_compile_fastmap],
130 [Define to rpl_re_compile_fastmap if the replacement should be used.])
131 AC_DEFINE([re_search], [rpl_re_search],
132 [Define to rpl_re_search if the replacement should be used.])
133 AC_DEFINE([re_search_2], [rpl_re_search_2],
134 [Define to rpl_re_search_2 if the replacement should be used.])
135 AC_DEFINE([re_match], [rpl_re_match],
136 [Define to rpl_re_match if the replacement should be used.])
137 AC_DEFINE([re_match_2], [rpl_re_match_2],
138 [Define to rpl_re_match_2 if the replacement should be used.])
139 AC_DEFINE([re_set_registers], [rpl_re_set_registers],
140 [Define to rpl_re_set_registers if the replacement should be used.])
141 AC_DEFINE([re_comp], [rpl_re_comp],
142 [Define to rpl_re_comp if the replacement should be used.])
143 AC_DEFINE([re_exec], [rpl_re_exec],
144 [Define to rpl_re_exec if the replacement should be used.])
145 AC_DEFINE([regcomp], [rpl_regcomp],
146 [Define to rpl_regcomp if the replacement should be used.])
147 AC_DEFINE([regexec], [rpl_regexec],
148 [Define to rpl_regexec if the replacement should be used.])
149 AC_DEFINE([regerror], [rpl_regerror],
150 [Define to rpl_regerror if the replacement should be used.])
151 AC_DEFINE([regfree], [rpl_regfree],
152 [Define to rpl_regfree if the replacement should be used.])
158 # Prerequisites of lib/regex.c and lib/regex_internal.c.
159 AC_DEFUN([gl_PREREQ_REGEX],
161 AC_REQUIRE([AC_GNU_SOURCE])
162 AC_REQUIRE([AC_C_RESTRICT])
163 AC_REQUIRE([AM_LANGINFO_CODESET])
164 AC_CHECK_HEADERS_ONCE([locale.h wchar.h wctype.h])
165 AC_CHECK_FUNCS_ONCE([mbrtowc mempcpy wcrtomb wcscoll])
166 AC_CHECK_DECLS([isblank], [], [], [#include <ctype.h>])