toplev.c: Check for null argument to fprintf

Ensure that CF does not equal NULL in function output_stack_usage_1
before calling fprintf.  This fixes the following warning/error:

gcc/toplev.c:976:13: error: argument 1 null where non-null expected [-Werror=nonnull]
  976 |     fprintf (cf, "\\n" HOST_WIDE_INT_PRINT_DEC " bytes (%s)",
      |     ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  977 |       stack_usage,
      |       ~~~~~~~~~~~~
  978 |       stack_usage_kind_str[stack_usage_kind]);

An example call side where CF is NULL is in function output_stack_usage.

gcc/ChangeLog:

2020-04-30  Stefan Schulze Frielinghaus  <stefansf@linux.ibm.com>

	* toplev.c (output_stack_usage_1): Ensure that first
	argument to fprintf is not null.

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index fc15925..8abb4c0 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2020-04-30  Stefan Schulze Frielinghaus  <stefansf@linux.ibm.com>
+
+       * toplev.c (output_stack_usage_1): Ensure that first
+       argument to fprintf is not null.
+
 2020-04-29  Jakub Jelinek  <jakub@redhat.com>
 
        * configure.ac (-with-changes-root-url): New configure option,

diff --git a/gcc/toplev.c b/gcc/toplev.c
index 4c8be50..5c026fe 100644 (file)
--- a/gcc/toplev.c
+++ b/gcc/toplev.c
@@ -972,7 +972,7 @@ output_stack_usage_1 (FILE *cf)
       stack_usage += current_function_dynamic_stack_size;
     }
 
-  if (flag_callgraph_info & CALLGRAPH_INFO_STACK_USAGE)
+  if (cf && flag_callgraph_info & CALLGRAPH_INFO_STACK_USAGE)
     fprintf (cf, "\\n" HOST_WIDE_INT_PRINT_DEC " bytes (%s)",
             stack_usage,
             stack_usage_kind_str[stack_usage_kind]);