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Re: [PATCH, testsuite] Prevent warnings due to dummy malloc calls.

On 11/26/2013 07:31 PM, Luis Machado wrote:
On 11/26/2013 07:12 PM, Doug Evans wrote:
On Tue, Nov 26, 2013 at 11:19 AM, Luis Machado
<> wrote:

When running GDB's testsuite with libraries/compilers that are more
restrictive in terms of warnings, i've found that some tests were
due to malloc being called but not having its return value assigned
to any
variables, leading to this warning:

warning: ignoring return value of 'malloc', declared with attribute
warn_unused_result [-Wunused-result]

The following patch adjusts those testcases to silence the warnings
by (1)
assigning malloc's return value and (2) freeing that pointer later on.

In the case of gdb.base/randomize.c, we're missing a free call, which
to an unused variable warning.


Coping with these kinds of warnings is a really slippery slope, the
testsuite is just not ready IMO.

Agreed. I had the greatest idea of checking other warnings in the
testsuite... but i came back to my senses and dropped it for now. :-)

OTOH, I don't mind changes like this particular one.

One nit:  Please change all occurrences of this:

+  if (p != NULL)
+    free (p);

to this

+  free (p);

It's simpler and equally correct.


The randomize.c case is a bit odd, printing p after it's freed.
Maybe just add a comment explaining why things are the way they are?

diff --git a/gdb/testsuite/gdb.base/randomize.c
index 6a65663..127a4c7 100644
--- a/gdb/testsuite/gdb.base/randomize.c
+++ b/gdb/testsuite/gdb.base/randomize.c
@@ -24,5 +24,8 @@ int main()
    p = malloc (1);

+  if (p != NULL)
+    free (p);
    return 0; /* print p */

Yeah, this really needs a different change, as done in the attached patch.


I've checked this in now.

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