3 dnl Initially derived from code in GNU grep.
4 dnl Mostly written by Jim Meyering.
8 jm_INCLUDED_REGEX([lib/regex.c])
11 dnl Usage: jm_INCLUDED_REGEX([lib/regex.c])
13 AC_DEFUN([jm_INCLUDED_REGEX],
15 dnl Even packages that don't use regex.c can use this macro.
16 dnl Of course, for them it doesn't do anything.
18 # Assume we'll default to using the included regex.c.
19 ac_use_included_regex=yes
21 # However, if the system regex support is good enough that it passes the
22 # the following run test, then default to *not* using the included regex.c.
23 # If cross compiling, assume the test would fail and use the included
24 # regex.c. The first failing regular expression is from `Spencer ere
25 # test #75' in grep-2.3.
26 AC_CACHE_CHECK([for working re_compile_pattern],
27 jm_cv_func_working_re_compile_pattern,
34 static struct re_pattern_buffer regex;
36 struct re_registers regs;
37 re_set_syntax (RE_SYNTAX_POSIX_EGREP);
38 [s = re_compile_pattern ("a[[:@:>@:]]b\n", 9, ®ex);]
39 /* This should fail with _Invalid character class name_ error. */
43 /* This should succeed, but doesn't for e.g. glibc-2.1.3. */
44 s = re_compile_pattern ("{1", 2, ®ex);
49 /* The following example is derived from a problem report
50 against gawk from Jorge Stolfi <stolfi@ic.unicamp.br>. */
51 s = re_compile_pattern ("[[anĂ¹]]*n", 7, ®ex);
55 /* This should match, but doesn't for e.g. glibc-2.2.1. */
56 if (re_match (®ex, "an", 2, 0, ®s) != 2)
62 jm_cv_func_working_re_compile_pattern=yes,
63 jm_cv_func_working_re_compile_pattern=no,
64 dnl When crosscompiling, assume it's broken.
65 jm_cv_func_working_re_compile_pattern=no))
66 if test $jm_cv_func_working_re_compile_pattern = yes; then
67 ac_use_included_regex=no
70 test -n "$1" || AC_MSG_ERROR([missing argument])
71 m4_syscmd([test -f $1])
74 AC_ARG_WITH(included-regex,
75 [ --without-included-regex don't compile regex; this is the default on
76 systems with version 2 of the GNU C library
77 (use with caution on other system)],
78 jm_with_regex=$withval,
79 jm_with_regex=$ac_use_included_regex)
80 if test "$jm_with_regex" = yes; then
89 # Prerequisites of lib/regex.c.
90 AC_DEFUN([jm_PREREQ_REGEX],
92 dnl FIXME: Maybe provide a btowc replacement someday: solaris-2.5.1 lacks it.
93 dnl FIXME: Check for wctype and iswctype, and and add -lw if necessary
96 dnl Persuade glibc <string.h> to declare mempcpy().
97 AC_REQUIRE([AC_GNU_SOURCE])
99 AC_REQUIRE([AC_FUNC_ALLOCA])
100 AC_REQUIRE([AC_HEADER_STDC])
101 AC_CHECK_HEADERS_ONCE(limits.h string.h wchar.h wctype.h)
102 AC_CHECK_FUNCS_ONCE(isascii mempcpy)
103 AC_CHECK_FUNCS(btowc)