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_broken],
42 [[static struct re_pattern_buffer regex;
44 struct re_registers regs;
45 /* Use the POSIX-compliant spelling with leading REG_,
46 rather than the traditional GNU spelling with leading RE_,
47 so that we reject older libc implementations. */
48 re_set_syntax (REG_SYNTAX_POSIX_EGREP);
49 memset (®ex, 0, sizeof (regex));
50 s = re_compile_pattern ("a[:@:>@:]b\n", 9, ®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 REG_IGNORE_CASE (which was then called RE_ICASE).
85 Detect that problem too. */
86 memset (®ex, 0, sizeof (regex));
87 re_set_syntax (REG_SYNTAX_EMACS | REG_IGNORE_CASE);
88 s = re_compile_pattern ("x", 1, ®ex);
92 if (re_search (®ex, "WXY", 3, 0, 3, ®s) < 0)
95 /* REG_STARTEND was added to glibc on 2004-01-15.
96 Reject older versions. */
100 /* Reject hosts whose regoff_t values are too narrow.
101 These include glibc 2.3.5 on hosts with 64-bit ptrdiff_t
103 if (sizeof (regoff_t) < sizeof (ptrdiff_t)
104 || sizeof (regoff_t) < sizeof (ssize_t))
108 [gl_cv_func_re_compile_pattern_broken=no],
109 [gl_cv_func_re_compile_pattern_broken=yes],
110 dnl When crosscompiling, assume it is broken.
111 [gl_cv_func_re_compile_pattern_broken=yes])])
112 ac_use_included_regex=$gl_cv_func_re_compile_pattern_broken
114 *) AC_MSG_ERROR([Invalid value for --with-included-regex: $with_included_regex])
118 if test $ac_use_included_regex = yes; then
119 AC_DEFINE([_REGEX_WIDE_OFFSETS], 1,
120 [Define if you want regoff_t to be at least as wide POSIX requires.])
121 AC_DEFINE([re_syntax_options], [rpl_re_syntax_options],
122 [Define to rpl_re_syntax_options if the replacement should be used.])
123 AC_DEFINE([re_set_syntax], [rpl_re_set_syntax],
124 [Define to rpl_re_set_syntax if the replacement should be used.])
125 AC_DEFINE([re_compile_pattern], [rpl_re_compile_pattern],
126 [Define to rpl_re_compile_pattern if the replacement should be used.])
127 AC_DEFINE([re_compile_fastmap], [rpl_re_compile_fastmap],
128 [Define to rpl_re_compile_fastmap if the replacement should be used.])
129 AC_DEFINE([re_search], [rpl_re_search],
130 [Define to rpl_re_search if the replacement should be used.])
131 AC_DEFINE([re_search_2], [rpl_re_search_2],
132 [Define to rpl_re_search_2 if the replacement should be used.])
133 AC_DEFINE([re_match], [rpl_re_match],
134 [Define to rpl_re_match if the replacement should be used.])
135 AC_DEFINE([re_match_2], [rpl_re_match_2],
136 [Define to rpl_re_match_2 if the replacement should be used.])
137 AC_DEFINE([re_set_registers], [rpl_re_set_registers],
138 [Define to rpl_re_set_registers if the replacement should be used.])
139 AC_DEFINE([re_comp], [rpl_re_comp],
140 [Define to rpl_re_comp if the replacement should be used.])
141 AC_DEFINE([re_exec], [rpl_re_exec],
142 [Define to rpl_re_exec if the replacement should be used.])
143 AC_DEFINE([regcomp], [rpl_regcomp],
144 [Define to rpl_regcomp if the replacement should be used.])
145 AC_DEFINE([regexec], [rpl_regexec],
146 [Define to rpl_regexec if the replacement should be used.])
147 AC_DEFINE([regerror], [rpl_regerror],
148 [Define to rpl_regerror if the replacement should be used.])
149 AC_DEFINE([regfree], [rpl_regfree],
150 [Define to rpl_regfree if the replacement should be used.])
156 # Prerequisites of lib/regex.c and lib/regex_internal.c.
157 AC_DEFUN([gl_PREREQ_REGEX],
159 AC_REQUIRE([AC_GNU_SOURCE])
160 AC_REQUIRE([gl_C_RESTRICT])
161 AC_REQUIRE([AM_LANGINFO_CODESET])
162 AC_CHECK_HEADERS_ONCE([locale.h wchar.h wctype.h])
163 AC_CHECK_FUNCS_ONCE([isblank mbrtowc mempcpy wcrtomb wcscoll])