[gdb/testsuite] Fix Wunused-result warning in until-reverse.c

When running test-case gdb.reverse/until-reverse.exp or
gdb.reverse/until-precsave.exp with gcc-10, we run into a Wunused-result
warning:
...
gdb compile failed, gdb.reverse/until-reverse.c: In function 'main':
gdb.reverse/until-reverse.c:40:14: warning: ignoring return value of \
  'malloc' declared with attribute 'warn_unused_result' [-Wunused-result]
   40 |       (void) malloc (1);
      |              ^~~~~~~~~~
...

Fix this by using the result of malloc as argument to a free call.

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2020-05-01  Tom de Vries  <tdevries@suse.de>

	* gdb.reverse/until-reverse.c (main): Fix Wunused-result warning.

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index e2bf45b3e3b260f758ab0a75b9066e637cd7f112..210499af06d4a983c4d1788c284c406ca0623c55 100644 (file)
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+2020-05-01  Tom de Vries  <tdevries@suse.de>
+
+       * gdb.reverse/until-reverse.c (main): Fix Wunused-result warning.
+
 2020-04-30  Hannes Domani  <ssbssa@yahoo.de>
 
        PR gdb/18706

diff --git a/gdb/testsuite/gdb.reverse/until-reverse.c b/gdb/testsuite/gdb.reverse/until-reverse.c
index e523235f34ca63f2da62f9281535c121314352c4..a8d8aed9aac686a8d76044c21bde045dd8faf294 100644 (file)
--- a/gdb/testsuite/gdb.reverse/until-reverse.c
+++ b/gdb/testsuite/gdb.reverse/until-reverse.c
@@ -37,7 +37,8 @@ main (int argc, char **argv, char **envp)
     {
       /* We're used by a test that requires malloc, so make sure it is
         in the executable.  */
-      (void) malloc (1);
+      void *p = malloc (1);
+      free (p);
       return 1;
     }