-#serial 1
+#serial 20
-dnl From grep.
+dnl Initially derived from code in GNU grep.
+dnl Mostly written by Jim Meyering.
-AC_DEFUN(jm_WITH_REGEX,
+AC_DEFUN([gl_REGEX],
+[
+ jm_INCLUDED_REGEX([lib/regex.c])
+])
+
+dnl Usage: jm_INCLUDED_REGEX([lib/regex.c])
+dnl
+AC_DEFUN([jm_INCLUDED_REGEX],
[
- AC_ARG_WITH(included-regex,
- [ --without-included-regex don't compile regex],
- jm_with_regex=$withval,
- jm_with_regex=yes)
- if test "$jm_with_regex" = yes; then
- LIBOBJS="$LIBOBJS regex.o"
+ dnl Even packages that don't use regex.c can use this macro.
+ dnl Of course, for them it doesn't do anything.
+
+ # Assume we'll default to using the included regex.c.
+ ac_use_included_regex=yes
+
+ # However, if the system regex support is good enough that it passes the
+ # the following run test, then default to *not* using the included regex.c.
+ # If cross compiling, assume the test would fail and use the included
+ # regex.c. The first failing regular expression is from `Spencer ere
+ # test #75' in grep-2.3.
+ AC_CACHE_CHECK([for working re_compile_pattern],
+ jm_cv_func_working_re_compile_pattern,
+ AC_TRY_RUN(
+[#include <stdio.h>
+#include <string.h>
+#include <regex.h>
+ int
+ main ()
+ {
+ static struct re_pattern_buffer regex;
+ const char *s;
+ struct re_registers regs;
+ re_set_syntax (RE_SYNTAX_POSIX_EGREP);
+ memset (®ex, 0, sizeof (regex));
+ [s = re_compile_pattern ("a[[:@:>@:]]b\n", 9, ®ex);]
+ /* This should fail with _Invalid character class name_ error. */
+ if (!s)
+ exit (1);
+
+ /* This should succeed, but doesn't for e.g. glibc-2.1.3. */
+ memset (®ex, 0, sizeof (regex));
+ s = re_compile_pattern ("{1", 2, ®ex);
+
+ if (s)
+ exit (1);
+
+ /* The following example is derived from a problem report
+ against gawk from Jorge Stolfi <stolfi@ic.unicamp.br>. */
+ memset (®ex, 0, sizeof (regex));
+ s = re_compile_pattern ("[[an\371]]*n", 7, ®ex);
+ if (s)
+ exit (1);
+
+ /* This should match, but doesn't for e.g. glibc-2.2.1. */
+ if (re_match (®ex, "an", 2, 0, ®s) != 2)
+ exit (1);
+
+ memset (®ex, 0, sizeof (regex));
+ s = re_compile_pattern ("x", 1, ®ex);
+ if (s)
+ exit (1);
+
+ /* The version of regex.c in e.g. GNU libc-2.2.93 didn't
+ work with a negative RANGE argument. */
+ if (re_search (®ex, "wxy", 3, 2, -2, ®s) != 1)
+ exit (1);
+
+ exit (0);
+ }
+ ],
+ jm_cv_func_working_re_compile_pattern=yes,
+ jm_cv_func_working_re_compile_pattern=no,
+ dnl When crosscompiling, assume it's broken.
+ jm_cv_func_working_re_compile_pattern=no))
+ if test $jm_cv_func_working_re_compile_pattern = yes; then
+ ac_use_included_regex=no
fi
+
+ test -n "$1" || AC_MSG_ERROR([missing argument])
+ m4_syscmd([test -f $1])
+ ifelse(m4_sysval, 0,
+ [
+ AC_ARG_WITH(included-regex,
+ [ --without-included-regex don't compile regex; this is the default on
+ systems with version 2 of the GNU C library
+ (use with caution on other system)],
+ jm_with_regex=$withval,
+ jm_with_regex=$ac_use_included_regex)
+ if test "$jm_with_regex" = yes; then
+ AC_LIBOBJ(regex)
+ jm_PREREQ_REGEX
+ fi
+ ],
+ )
]
)
+
+# Prerequisites of lib/regex.c.
+AC_DEFUN([jm_PREREQ_REGEX],
+[
+ dnl FIXME: Maybe provide a btowc replacement someday: Solaris 2.5.1 lacks it.
+ dnl FIXME: Check for wctype and iswctype, and and add -lw if necessary
+ dnl to get them.
+
+ dnl Persuade glibc <string.h> to declare mempcpy().
+ AC_REQUIRE([AC_GNU_SOURCE])
+
+ AC_REQUIRE([gl_C_RESTRICT])
+ AC_REQUIRE([AC_FUNC_ALLOCA])
+ AC_REQUIRE([AC_HEADER_STDC])
+ AC_CHECK_HEADERS_ONCE(wchar.h wctype.h)
+ AC_CHECK_FUNCS_ONCE(isascii mempcpy)
+ AC_CHECK_FUNCS(btowc)
+])