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.
18 [regcomp.c, regex.c, regex.h,
19 regex_internal.c, regex_internal.h, regexec.c])
21 AC_ARG_WITH([included-regex],
22 [AC_HELP_STRING([--without-included-regex],
23 [don't compile regex; this is the default on
24 systems with recent-enough versions of the GNU C
25 Library (use with caution on other systems)])])
27 case $with_included_regex in #(
28 yes|no) ac_use_included_regex=$with_included_regex
31 # If the system regex support is good enough that it passes the the
32 # following run test, then default to *not* using the included regex.c.
33 # If cross compiling, assume the test would fail and use the included
34 # regex.c. The first failing regular expression is from `Spencer ere
35 # test #75' in grep-2.3.
36 AC_CACHE_CHECK([for working re_compile_pattern],
37 [gl_cv_func_re_compile_pattern_working],
44 [[static struct re_pattern_buffer regex;
45 unsigned char folded_chars[UCHAR_MAX + 1];
48 struct re_registers regs;
49 re_set_syntax (RE_SYNTAX_POSIX_EGREP);
50 memset (®ex, 0, sizeof (regex));
51 for (i = 0; i <= UCHAR_MAX; i++)
53 regex.translate = folded_chars;
54 s = re_compile_pattern ("a[[:@:>@:]]b\n", 11, ®ex);
55 /* This should fail with _Invalid character class name_ error. */
59 /* This should succeed, but does not for e.g. glibc-2.1.3. */
60 memset (®ex, 0, sizeof (regex));
61 s = re_compile_pattern ("{1", 2, ®ex);
66 /* The following example is derived from a problem report
67 against gawk from Jorge Stolfi <stolfi@ic.unicamp.br>. */
68 memset (®ex, 0, sizeof (regex));
69 s = re_compile_pattern ("[an\371]*n", 7, ®ex);
73 /* This should match, but does not for e.g. glibc-2.2.1. */
74 if (re_match (®ex, "an", 2, 0, ®s) != 2)
77 memset (®ex, 0, sizeof (regex));
78 s = re_compile_pattern ("x", 1, ®ex);
82 /* The version of regex.c in e.g. GNU libc-2.2.93 did not
83 work with a negative RANGE argument. */
84 if (re_search (®ex, "wxy", 3, 2, -2, ®s) != 1)
87 /* The version of regex.c in older versions of gnulib
88 ignored RE_ICASE. Detect that problem too. */
89 memset (®ex, 0, sizeof (regex));
90 re_set_syntax (RE_SYNTAX_EMACS | RE_ICASE);
91 s = re_compile_pattern ("x", 1, ®ex);
95 if (re_search (®ex, "WXY", 3, 0, 3, ®s) < 0)
98 /* REG_STARTEND was added to glibc on 2004-01-15.
99 Reject older versions. */
103 /* Reject hosts whose regoff_t values are too narrow.
104 These include glibc 2.3.5 on hosts with 64-bit ptrdiff_t
106 if (sizeof (regoff_t) < sizeof (ptrdiff_t)
107 || sizeof (regoff_t) < sizeof (ssize_t))
111 [gl_cv_func_re_compile_pattern_working=yes],
112 [gl_cv_func_re_compile_pattern_working=no],
113 dnl When crosscompiling, assume it is not working.
114 [gl_cv_func_re_compile_pattern_working=no])])
115 case $gl_cv_func_re_compile_pattern_working in #(
116 yes) ac_use_included_regex=no;; #(
117 no) ac_use_included_regex=yes;;
120 *) AC_MSG_ERROR([Invalid value for --with-included-regex: $with_included_regex])
124 if test $ac_use_included_regex = yes; then
125 AC_DEFINE([_REGEX_LARGE_OFFSETS], 1,
126 [Define if you want regoff_t to be at least as wide POSIX requires.])
127 AC_DEFINE([re_syntax_options], [rpl_re_syntax_options],
128 [Define to rpl_re_syntax_options if the replacement should be used.])
129 AC_DEFINE([re_set_syntax], [rpl_re_set_syntax],
130 [Define to rpl_re_set_syntax if the replacement should be used.])
131 AC_DEFINE([re_compile_pattern], [rpl_re_compile_pattern],
132 [Define to rpl_re_compile_pattern if the replacement should be used.])
133 AC_DEFINE([re_compile_fastmap], [rpl_re_compile_fastmap],
134 [Define to rpl_re_compile_fastmap if the replacement should be used.])
135 AC_DEFINE([re_search], [rpl_re_search],
136 [Define to rpl_re_search if the replacement should be used.])
137 AC_DEFINE([re_search_2], [rpl_re_search_2],
138 [Define to rpl_re_search_2 if the replacement should be used.])
139 AC_DEFINE([re_match], [rpl_re_match],
140 [Define to rpl_re_match if the replacement should be used.])
141 AC_DEFINE([re_match_2], [rpl_re_match_2],
142 [Define to rpl_re_match_2 if the replacement should be used.])
143 AC_DEFINE([re_set_registers], [rpl_re_set_registers],
144 [Define to rpl_re_set_registers if the replacement should be used.])
145 AC_DEFINE([re_comp], [rpl_re_comp],
146 [Define to rpl_re_comp if the replacement should be used.])
147 AC_DEFINE([re_exec], [rpl_re_exec],
148 [Define to rpl_re_exec if the replacement should be used.])
149 AC_DEFINE([regcomp], [rpl_regcomp],
150 [Define to rpl_regcomp if the replacement should be used.])
151 AC_DEFINE([regexec], [rpl_regexec],
152 [Define to rpl_regexec if the replacement should be used.])
153 AC_DEFINE([regerror], [rpl_regerror],
154 [Define to rpl_regerror if the replacement should be used.])
155 AC_DEFINE([regfree], [rpl_regfree],
156 [Define to rpl_regfree if the replacement should be used.])
162 # Prerequisites of lib/regex.c and lib/regex_internal.c.
163 AC_DEFUN([gl_PREREQ_REGEX],
165 AC_REQUIRE([AC_GNU_SOURCE])
166 AC_REQUIRE([gl_C_RESTRICT])
167 AC_REQUIRE([AM_LANGINFO_CODESET])
168 AC_CHECK_HEADERS_ONCE([locale.h wchar.h wctype.h])
169 AC_CHECK_FUNCS_ONCE([mbrtowc mempcpy wcrtomb wcscoll])
170 AC_CHECK_DECLS([isblank], [], [], [#include <ctype.h>])