New module 'extensions', used by timespec and unlocked-io

[gnulib.git] / m4 / regex.m4

diff --git a/m4/regex.m4 b/m4/regex.m4
index 0017507..98c6509 100644 (file)
--- a/m4/regex.m4
+++ b/m4/regex.m4
@@ -1,8 +1,13 @@
-#serial 12
+#serial 18
 
 dnl Initially derived from code in GNU grep.
 dnl Mostly written by Jim Meyering.
 
+AC_DEFUN([gl_REGEX],
+[
+  jm_INCLUDED_REGEX([lib/regex.c])
+])
+
 dnl Usage: jm_INCLUDED_REGEX([lib/regex.c])
 dnl
 AC_DEFUN([jm_INCLUDED_REGEX],
@@ -22,6 +27,7 @@ AC_DEFUN([jm_INCLUDED_REGEX],
                   jm_cv_func_working_re_compile_pattern,
       AC_TRY_RUN(
 [#include <stdio.h>
+#include <string.h>
 #include <regex.h>
          int
          main ()
@@ -30,12 +36,14 @@ AC_DEFUN([jm_INCLUDED_REGEX],
            const char *s;
            struct re_registers regs;
            re_set_syntax (RE_SYNTAX_POSIX_EGREP);
+           memset (&regex, 0, sizeof (regex));
            [s = re_compile_pattern ("a[[:@:>@:]]b\n", 9, &regex);]
            /* 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 (&regex, 0, sizeof (regex));
            s = re_compile_pattern ("{1", 2, &regex);
 
            if (s)
@@ -43,7 +51,8 @@ AC_DEFUN([jm_INCLUDED_REGEX],
 
            /* The following example is derived from a problem report
                against gawk from Jorge Stolfi <stolfi@ic.unicamp.br>.  */
-           s = re_compile_pattern ("[[anù]]*n", 7, &regex);
+           memset (&regex, 0, sizeof (regex));
+           s = re_compile_pattern ("[[an\201]]*n", 7, &regex);
            if (s)
              exit (1);
 
@@ -51,6 +60,16 @@ AC_DEFUN([jm_INCLUDED_REGEX],
            if (re_match (&regex, "an", 2, 0, &regs) != 2)
              exit (1);
 
+           memset (&regex, 0, sizeof (regex));
+           s = re_compile_pattern ("x", 1, &regex);
+           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 (&regex, "wxy", 3, 2, -2, &regs) != 1)
+             exit (1);
+
            exit (0);
          }
        ],
@@ -74,8 +93,27 @@ AC_DEFUN([jm_INCLUDED_REGEX],
                    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(limits.h string.h wchar.h wctype.h)
+  AC_CHECK_FUNCS_ONCE(isascii mempcpy)
+  AC_CHECK_FUNCS(btowc)
+])