diff --git a/ChangeLog b/ChangeLog
index 563f16f24b..a8e575ffdf 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2005-09-27  Ulrich Drepper  <drepper@redhat.com>
+
+	[BZ #1230]
+	* stdlib/strtod_l.c (STRNCASECMP): Always use C locale object.
+	(TOLOWER_C): Define.  Use it when recognizing inf and nan.
+	* stdlib/Makefile (tests): Add bug-strtod2.
+	* stdlib/bug-strtod2.c: New file.
+
 2005-09-21  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>
 
 	[BZ #1361]
diff --git a/stdlib/Depend b/stdlib/Depend
new file mode 100644
index 0000000000..f3e1156a4e
--- /dev/null
+++ b/stdlib/Depend
@@ -0,0 +1 @@
+localedata
diff --git a/stdlib/Makefile b/stdlib/Makefile
index 509a7b2228..9a9ff8bd45 100644
--- a/stdlib/Makefile
+++ b/stdlib/Makefile
@@ -63,7 +63,7 @@ tests		:= tst-strtol tst-strtod testmb testrand testsort testdiv   \
 		   test-canon test-canon2 tst-strtoll tst-environ	    \
 		   tst-xpg-basename tst-random tst-random2 tst-bsearch	    \
 		   tst-limits tst-rand48 bug-strtod tst-setcontext	    \
-		   test-a64l tst-qsort tst-system testmb2
+		   test-a64l tst-qsort tst-system testmb2 bug-strtod2
 
 include ../Makeconfig
 
diff --git a/stdlib/bug-strtod2.c b/stdlib/bug-strtod2.c
new file mode 100644
index 0000000000..a1f037cdc8
--- /dev/null
+++ b/stdlib/bug-strtod2.c
@@ -0,0 +1,46 @@
+#include <locale.h>
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+static const char *tests[] =
+  {
+    "inf", "Inf", "iNf", "inF", "INf", "iNF", "INF", "InF",
+    "infinity", "Infinity", "InfInity", "INFINITY"
+  };
+#define ntests (sizeof (tests) / sizeof (tests[0]))
+
+static int
+do_test (void)
+{
+  /* The Turkish locale is notorious because tolower() maps 'I' to the
+     dotless lowercase 'i' and toupper() maps 'i' to an 'I' with a dot
+     above.  */
+  if (setlocale (LC_ALL, "tr_TR.UTF-8") == NULL)
+    {
+      puts ("cannot set locale");
+      return 0;
+    }
+
+  int res = 0;
+  for (int i = 0; i < ntests; ++i)
+    {
+      char *endp;
+      double d = strtod (tests[i], &endp);
+      if (*endp != '\0')
+	{
+	  printf ("did not consume all of '%s'\n", tests[i]);
+	  res = 1;
+	}
+      if (!isinf (d))
+	{
+	  printf ("'%s' does not pass isinf\n", tests[i]);
+	  res = 1;
+	}
+    }
+
+  return res;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"
diff --git a/stdlib/strtod_l.c b/stdlib/strtod_l.c
index a656789f4c..3a1c1ebd4b 100644
--- a/stdlib/strtod_l.c
+++ b/stdlib/strtod_l.c
@@ -1,5 +1,5 @@
 /* Convert string representing a number to float value, using given locale.
-   Copyright (C) 1997,98,2002, 2004 Free Software Foundation, Inc.
+   Copyright (C) 1997,98,2002,2004,2005 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
 
@@ -100,7 +100,9 @@ extern unsigned long long int ____strtoull_l_internal (const char *, char **,
 # define ISDIGIT(Ch) __iswdigit_l ((Ch), loc)
 # define ISXDIGIT(Ch) __iswxdigit_l ((Ch), loc)
 # define TOLOWER(Ch) __towlower_l ((Ch), loc)
-# define STRNCASECMP(S1, S2, N) __wcsncasecmp_l ((S1), (S2), (N), loc)
+# define TOLOWER_C(Ch) __towlower_l ((Ch), &_nl_C_locobj)
+# define STRNCASECMP(S1, S2, N) \
+  __wcsncasecmp_l ((S1), (S2), (N), &_nl_C_locobj)
 # define STRTOULL(S, E, B) ____wcstoull_l_internal ((S), (E), (B), 0, loc)
 #else
 # define STRING_TYPE char
@@ -110,7 +112,9 @@ extern unsigned long long int ____strtoull_l_internal (const char *, char **,
 # define ISDIGIT(Ch) __isdigit_l ((Ch), loc)
 # define ISXDIGIT(Ch) __isxdigit_l ((Ch), loc)
 # define TOLOWER(Ch) __tolower_l ((Ch), loc)
-# define STRNCASECMP(S1, S2, N) __strncasecmp_l ((S1), (S2), (N), loc)
+# define TOLOWER_C(Ch) __tolower_l ((Ch), &_nl_C_locobj)
+# define STRNCASECMP(S1, S2, N) \
+  __strncasecmp_l ((S1), (S2), (N), &_nl_C_locobj)
 # define STRTOULL(S, E, B) ____strtoull_l_internal ((S), (E), (B), 0, loc)
 #endif
 
@@ -554,7 +558,7 @@ INTERNAL (__STRTOF) (nptr, endptr, group, loc)
   else if (c < L_('0') || c > L_('9'))
     {
       /* Check for `INF' or `INFINITY'.  */
-      if (TOLOWER (c) == L_('i') && STRNCASECMP (cp, L_("inf"), 3) == 0)
+      if (TOLOWER_C (c) == L_('i') && STRNCASECMP (cp, L_("inf"), 3) == 0)
 	{
 	  /* Return +/- infinity.  */
 	  if (endptr != NULL)
@@ -565,7 +569,7 @@ INTERNAL (__STRTOF) (nptr, endptr, group, loc)
 	  return negative ? -FLOAT_HUGE_VAL : FLOAT_HUGE_VAL;
 	}
 
-      if (TOLOWER (c) == L_('n') && STRNCASECMP (cp, L_("nan"), 3) == 0)
+      if (TOLOWER_C (c) == L_('n') && STRNCASECMP (cp, L_("nan"), 3) == 0)
 	{
 	  /* Return NaN.  */
 	  FLOAT retval = NAN;