* regex.m4 (gl_REGEX): Check whether off_t can be used in a switch

[gnulib.git] / m4 / regex.m4

diff --git a/m4/regex.m4 b/m4/regex.m4
index 5cf81fa..8ea4fe9 100644 (file)
--- a/m4/regex.m4
+++ b/m4/regex.m4
@@ -1,4 +1,4 @@
-#serial 27
+#serial 31

 
 # Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005 Free
 # Software Foundation, Inc.
 
 # Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005 Free
 # Software Foundation, Inc.


@@ -10,27 +10,58 @@
 dnl Initially derived from code in GNU grep.
 dnl Mostly written by Jim Meyering.
 
 dnl Initially derived from code in GNU grep.
 dnl Mostly written by Jim Meyering.
 

+AC_PREREQ([2.50])
+

 AC_DEFUN([gl_REGEX],
 [
 AC_DEFUN([gl_REGEX],
 [

+  AC_REQUIRE([AC_SYS_LARGEFILE]) dnl for a sufficently-wide off_t
+
+  AC_CACHE_CHECK([whether off_t can be used in a switch statement],
+    [gl_cv_type_off_t_switch],
+    [AC_COMPILE_IFELSE(
+      [AC_LANG_PROGRAM(
+         [AC_INCLUDES_DEFAULT],
+        [[off_t o = -1;
+          switch (o)
+            {
+            case -2:
+              return 1;
+            case -1:
+              return 2;
+            default:
+              return 0;
+            }
+        ]])],
+      [gl_cv_type_off_t_switch=yes],
+      [gl_cv_type_off_t_switch=no])])
+  if test $gl_cv_type_off_t_switch = yes; then
+    AC_DEFINE([_REGEX_LARGE_OFFSETS], 1,
+      [Define if you want regoff_t to be at least as wide POSIX requires.])
+  fi
+

   AC_LIBSOURCES(
     [regcomp.c, regex.c, regex.h,
      regex_internal.c, regex_internal.h, regexec.c])
 
   AC_LIBSOURCES(
     [regcomp.c, regex.c, regex.h,
      regex_internal.c, regex_internal.h, regexec.c])
 

-  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],
-                [gl_cv_func_working_re_compile_pattern],
-    [AC_RUN_IFELSE(
-       [AC_LANG_PROGRAM(
+  AC_ARG_WITH([included-regex],
+    [AC_HELP_STRING([--without-included-regex],
+                   [don't compile regex; this is the default on
+                    systems with recent-enough versions of the GNU C
+                    Library (use with caution on other systems)])])
+
+  case $with_included_regex in
+  yes|no) ac_use_included_regex=$with_included_regex
+       ;;
+  '')
+    # 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],
+                  [gl_cv_func_re_compile_pattern_broken],
+      [AC_RUN_IFELSE(
+       [AC_LANG_PROGRAM(

          [AC_INCLUDES_DEFAULT
           #include <regex.h>],
          [[static struct re_pattern_buffer regex;
          [AC_INCLUDES_DEFAULT
           #include <regex.h>],
          [[static struct re_pattern_buffer regex;


@@ -91,22 +122,55 @@ AC_DEFUN([gl_REGEX],
            if (! REG_STARTEND)
              exit (1);
 
            if (! REG_STARTEND)
              exit (1);
 

+           /* Reject hosts whose regoff_t values are too narrow.
+              These include glibc 2.3.5 on hosts with 64-bit off_t
+              and 32-bit int, and Solaris 10 on hosts with 32-bit int
+              and _FILE_OFFSET_BITS=64.  */
+           if (sizeof (regoff_t) < sizeof (off_t))
+             exit (1);
+

            exit (0);]])],
            exit (0);]])],

-       [gl_cv_func_working_re_compile_pattern=yes],
-       [gl_cv_func_working_re_compile_pattern=no],
+       [gl_cv_func_re_compile_pattern_broken=no],
+       [gl_cv_func_re_compile_pattern_broken=yes],

        dnl When crosscompiling, assume it is broken.
        dnl When crosscompiling, assume it is broken.

-       [gl_cv_func_working_re_compile_pattern=no])])
-  if test $gl_cv_func_working_re_compile_pattern = yes; then
-    ac_use_included_regex=no
-  fi
-
-  AC_ARG_WITH([included-regex],
-    [  --without-included-regex don't compile regex; this is the default on
-                       systems with recent-enough versions of the GNU C
-                       Library (use with caution on other systems)],
-    [gl_with_regex=$withval],
-    [gl_with_regex=$ac_use_included_regex])
-  if test "X$gl_with_regex" = Xyes; then
+       [gl_cv_func_re_compile_pattern_broken=yes])])
+    ac_use_included_regex=$gl_cv_func_re_compile_pattern_broken
+    ;;
+  *) AC_MSG_ERROR([Invalid value for --with-included-regex: $with_included_regex])
+    ;;
+  esac
+
+  if test $ac_use_included_regex = yes; then
+    AC_DEFINE([re_syntax_options], [rpl_re_syntax_options],
+      [Define to rpl_re_syntax_options if the replacement should be used.])
+    AC_DEFINE([re_set_syntax], [rpl_re_set_syntax],
+      [Define to rpl_re_set_syntax if the replacement should be used.])
+    AC_DEFINE([re_compile_pattern], [rpl_re_compile_pattern],
+      [Define to rpl_re_compile_pattern if the replacement should be used.])
+    AC_DEFINE([re_compile_fastmap], [rpl_re_compile_fastmap],
+      [Define to rpl_re_compile_fastmap if the replacement should be used.])
+    AC_DEFINE([re_search], [rpl_re_search],
+      [Define to rpl_re_search if the replacement should be used.])
+    AC_DEFINE([re_search_2], [rpl_re_search_2],
+      [Define to rpl_re_search_2 if the replacement should be used.])
+    AC_DEFINE([re_match], [rpl_re_match],
+      [Define to rpl_re_match if the replacement should be used.])
+    AC_DEFINE([re_match_2], [rpl_re_match_2],
+      [Define to rpl_re_match_2 if the replacement should be used.])
+    AC_DEFINE([re_set_registers], [rpl_re_set_registers],
+      [Define to rpl_re_set_registers if the replacement should be used.])
+    AC_DEFINE([re_comp], [rpl_re_comp],
+      [Define to rpl_re_comp if the replacement should be used.])
+    AC_DEFINE([re_exec], [rpl_re_exec],
+      [Define to rpl_re_exec if the replacement should be used.])
+    AC_DEFINE([regcomp], [rpl_regcomp],
+      [Define to rpl_regcomp if the replacement should be used.])
+    AC_DEFINE([regexec], [rpl_regexec],
+      [Define to rpl_regexec if the replacement should be used.])
+    AC_DEFINE([regerror], [rpl_regerror],
+      [Define to rpl_regerror if the replacement should be used.])
+    AC_DEFINE([regfree], [rpl_regfree],
+      [Define to rpl_regfree if the replacement should be used.])

     AC_LIBOBJ([regex])
     gl_PREREQ_REGEX
   fi
     AC_LIBOBJ([regex])
     gl_PREREQ_REGEX
   fi