# HG changeset patch
# User Paul Eggert <eggert@cs.ucla.edu>
# Date 1133483409 0
# Node ID 3c1ffaf1172da23502d45853582e1a9f02fcf7f4
# Parent  ab2065ce24015c8cd06a29fa6b9e8455c54d4010
* regex.m4 (gl_REGEX): Check whether off_t can be used in a switch
statement, to work around an HP-UX 10.20 compiler bug reported by
Peter O'Gorman.

diff --git a/m4/ChangeLog b/m4/ChangeLog
--- a/m4/ChangeLog
+++ b/m4/ChangeLog
@@ -1,3 +1,9 @@
+2005-12-01  Paul Eggert  <eggert@cs.ucla.edu>
+
+	* regex.m4 (gl_REGEX): Check whether off_t can be used in a switch
+	statement, to work around an HP-UX 10.20 compiler bug reported by
+	Peter O'Gorman.
+
 2005-11-10  Paul Eggert  <eggert@cs.ucla.edu>
 
 	* gethrxtime.m4 (gl_PREREQ_GETHRXTIME): Don't require AC_HEADER_TIME
diff --git a/m4/regex.m4 b/m4/regex.m4
--- a/m4/regex.m4
+++ b/m4/regex.m4
@@ -1,4 +1,4 @@
-#serial 30
+#serial 31
 
 # Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005 Free
 # Software Foundation, Inc.
@@ -15,8 +15,29 @@
 AC_DEFUN([gl_REGEX],
 [
   AC_REQUIRE([AC_SYS_LARGEFILE]) dnl for a sufficently-wide off_t
-  AC_DEFINE([_REGEX_LARGE_OFFSETS], 1,
-    [Define if you want regoff_t to be at least as wide POSIX requires.])
+
+  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,