diff --git a/libgfortran/ChangeLog b/libgfortran/ChangeLog
index a75c91db08f..6dcc055c7db 100644
--- a/libgfortran/ChangeLog
+++ b/libgfortran/ChangeLog
@@ -1,3 +1,14 @@
+2007-10-18  Francois-Xavier Coudert  <fxcoudert@gcc.gnu.org>
+
+	PR libfortran/32021
+	* runtime/backtrace.c (local_strcasestr): Protect by appropriate
+	macros.
+	* runtime/main.c (cleanup): Cast argument to free.
+	* intrinsics/spread_generic.c (spread_internal): Match runtime_error
+	arguments and format.
+	* intrinsics/signal.c (alarm_sub_int_i4, alarm_sub_int_i8): Cast
+	pointers to avoid warnings.
+
 2007-10-18  Ben Elliston  <bje@au.ibm.com>
 
 	* runtime/environ.c (init_choice): Remove unused function.
diff --git a/libgfortran/intrinsics/signal.c b/libgfortran/intrinsics/signal.c
index 2e28b543763..84565e8e497 100644
--- a/libgfortran/intrinsics/signal.c
+++ b/libgfortran/intrinsics/signal.c
@@ -198,14 +198,14 @@ alarm_sub_int_i4 (int *seconds, int *handler, GFC_INTEGER_4 *status)
 #if defined (SIGALRM) && defined (HAVE_ALARM) && defined (HAVE_SIGNAL)
   if (status != NULL)
     {
-      if (signal (SIGALRM, (void (*)(int)) *handler) == SIG_ERR)
+      if (signal (SIGALRM, (void (*)(int)) (INTPTR_T) *handler) == SIG_ERR)
 	*status = -1;
       else
 	*status = alarm (*seconds);
     }
   else
     {
-      signal (SIGALRM, (void (*)(int)) *handler);
+      signal (SIGALRM, (void (*)(int)) (INTPTR_T) *handler);
       alarm (*seconds);
     }
 #else
@@ -226,14 +226,14 @@ alarm_sub_int_i8 (int *seconds, int *handler, GFC_INTEGER_8 *status)
 #if defined (SIGALRM) && defined (HAVE_ALARM) && defined (HAVE_SIGNAL)
   if (status != NULL)
     {
-      if (signal (SIGALRM, (void (*)(int)) *handler) == SIG_ERR)
+      if (signal (SIGALRM, (void (*)(int)) (INTPTR_T) *handler) == SIG_ERR)
 	*status = -1;
       else
 	*status = alarm (*seconds);
     }
   else
     {
-      signal (SIGALRM, (void (*)(int)) *handler);
+      signal (SIGALRM, (void (*)(int)) (INTPTR_T) *handler);
       alarm (*seconds);
     }
 #else
diff --git a/libgfortran/intrinsics/spread_generic.c b/libgfortran/intrinsics/spread_generic.c
index 3752717aa8e..4be0a164c8a 100644
--- a/libgfortran/intrinsics/spread_generic.c
+++ b/libgfortran/intrinsics/spread_generic.c
@@ -131,9 +131,9 @@ spread_internal (gfc_array_char *ret, const gfc_array_char *source,
 
 		  if (ret_extent != ncopies)
 		    runtime_error("Incorrect extent in return value of SPREAD"
-				  " intrinsic in dimension %d: is %ld,"
-				  " should be %ld", n+1, (long int) ret_extent,
-				  (long int) ncopies);
+				  " intrinsic in dimension %ld: is %ld,"
+				  " should be %ld", (long int) n+1,
+				  (long int) ret_extent, (long int) ncopies);
 		}
 	      else
 		{
@@ -142,8 +142,9 @@ spread_internal (gfc_array_char *ret, const gfc_array_char *source,
 		    - source->dim[dim].lbound;
 		  if (ret_extent != extent[dim])
 		    runtime_error("Incorrect extent in return value of SPREAD"
-				  " intrinsic in dimension %d: is %ld,"
-				  " should be %ld", n+1, (long int) ret_extent,
+				  " intrinsic in dimension %ld: is %ld,"
+				  " should be %ld", (long int) n+1,
+				  (long int) ret_extent,
 				  (long int) extent[dim]);
 		    
 		  if (extent[dim] <= 0)
diff --git a/libgfortran/runtime/backtrace.c b/libgfortran/runtime/backtrace.c
index 9f97fe4dcd6..00605b50d3f 100644
--- a/libgfortran/runtime/backtrace.c
+++ b/libgfortran/runtime/backtrace.c
@@ -60,7 +60,18 @@ Boston, MA 02110-1301, USA.  */
 #include <ctype.h>
 
 
+/* Macros for common sets of capabilities: can we fork and exec, can
+   we use glibc-style backtrace functions, and can we use pipes.  */
+#define CAN_FORK (defined(HAVE_FORK) && defined(HAVE_EXECVP) \
+		  && defined(HAVE_WAIT))
+#define GLIBC_BACKTRACE (defined(HAVE_BACKTRACE) \
+			 && defined(HAVE_BACKTRACE_SYMBOLS))
+#define CAN_PIPE (CAN_FORK && defined(HAVE_PIPE) \
+		  && defined(HAVE_DUP2) && defined(HAVE_FDOPEN) \
+		  && defined(HAVE_CLOSE))
 
+
+#if GLIBC_BACKTRACE && CAN_PIPE
 static char *
 local_strcasestr (const char *s1, const char *s2)
 {
@@ -85,14 +96,7 @@ local_strcasestr (const char *s1, const char *s2)
     }
 #endif
 }
-
-#define CAN_FORK (defined(HAVE_FORK) && defined(HAVE_EXECVP) \
-		  && defined(HAVE_WAIT))
-#define GLIBC_BACKTRACE (defined(HAVE_BACKTRACE) \
-			 && defined(HAVE_BACKTRACE_SYMBOLS))
-#define CAN_PIPE (CAN_FORK && defined(HAVE_PIPE) \
-		  && defined(HAVE_DUP2) && defined(HAVE_FDOPEN) \
-		  && defined(HAVE_CLOSE))
+#endif
 
 
 #if GLIBC_BACKTRACE
diff --git a/libgfortran/runtime/main.c b/libgfortran/runtime/main.c
index 86777d9c70e..8632f152c95 100644
--- a/libgfortran/runtime/main.c
+++ b/libgfortran/runtime/main.c
@@ -176,5 +176,5 @@ cleanup (void)
   close_units ();
   
   if (please_free_exe_path_when_done)
-    free (exe_path);
+    free ((char *) exe_path);
 }