X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fregex.m4;h=696fce1ee4eb67f6537f14ef3d0c0cf8266145ff;hb=31d4ee218ba9dabe654a9fbf53a72e5bf203b0dc;hp=df78cbb89fd693782789002da8a5eb0e82e9ce3a;hpb=e62d4d88ece0086446631e65b3f647d9696b04c3;p=gnulib.git

diff --git a/m4/regex.m4 b/m4/regex.m4
index df78cbb89..696fce1ee 100644
--- a/m4/regex.m4
+++ b/m4/regex.m4
@@ -1,61 +1,90 @@
-#serial 4
+#serial 21
 
 dnl Initially derived from code in GNU grep.
 dnl Mostly written by Jim Meyering.
 
-AC_DEFUN(jm_WITH_REGEX,
-  [
-    AC_REQUIRE([AM_GLIBC])
+AC_DEFUN([gl_REGEX],
+[
+  gl_INCLUDED_REGEX([lib/regex.c])
+])
 
+dnl Usage: gl_INCLUDED_REGEX([lib/regex.c])
+dnl
+AC_DEFUN([gl_INCLUDED_REGEX],
+  [
     dnl Even packages that don't use regex.c can use this macro.
     dnl Of course, for them it doesn't do anything.
 
-    # By default, don't use the included regex.c on systems with a version
-    # of glibc 2 that's new enough to pass the following run test.
-    # If cross compiling, assume the test would fail and use the included
-    # regex.c.  The failing regular expression is from `Spencer ere test
-    # #75' in grep-2.2f.
+    # Assume we'll default to using the included regex.c.
     ac_use_included_regex=yes
 
-    if test "$ac_cv_glibc" = yes; then
-      # Without this run-test, on older glibc2 systems we'd end up
-      # using the buggy system regex.
-      AC_CACHE_CHECK([for working re_compile_pattern],
-                     jm_cv_func_working_re_compile_pattern,
-	AC_TRY_RUN(
-	  changequote(<<, >>)dnl
-	  <<
-#include <stdio.h>
+    # 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;
-	      re_set_syntax (RE_SYNTAX_POSIX_EGREP);
-	      /* Add this third left square bracket, [, to balance the
-		 three right ones below.  Otherwise autoconf-2.14 chokes.  */
-	      s = re_compile_pattern ("a[[:]:]]b\n", 9, &regex);
-	      /* This should fail with _Invalid character class name_ error.  */
-	      exit (s ? 0 : 1);
-	    }
-	  >>,
-	  changequote([, ])dnl
-
-		 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
+	  int
+	  main ()
+	  {
+	    static struct re_pattern_buffer 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)
+	      exit (1);
+
+	    /* The following example is derived from a problem report
+               against gawk from Jorge Stolfi <stolfi@ic.unicamp.br>.  */
+	    memset (&regex, 0, sizeof (regex));
+	    s = re_compile_pattern ("[[an\371]]*n", 7, &regex);
+	    if (s)
+	      exit (1);
+
+	    /* This should match, but doesn't for e.g. glibc-2.2.1.  */
+	    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);
+	  }
+	],
+	       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])
-    syscmd([test -f $1])
-    ifelse(sysval, 0,
+    m4_syscmd([test -f $1])
+    ifelse(m4_sysval, 0,
       [
-
 	AC_ARG_WITH(included-regex,
 	[  --without-included-regex don't compile regex; this is the default on
                           systems with version 2 of the GNU C library
@@ -63,9 +92,28 @@ AC_DEFUN(jm_WITH_REGEX,
 		    jm_with_regex=$withval,
 		    jm_with_regex=$ac_use_included_regex)
 	if test "$jm_with_regex" = yes; then
-	  LIBOBJS="$LIBOBJS regex.$ac_objext"
+	  AC_LIBOBJ(regex)
+	  gl_PREREQ_REGEX
 	fi
       ],
     )
   ]
 )
+
+# Prerequisites of lib/regex.c.
+AC_DEFUN([gl_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)
+])