[glibc/release/2.29/master] malloc: Fix warnings in tests with GCC 9

[Florian Weimer <fw at sourceware dot org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=bd0a325b6a263ae9dd9107d3476b1a594f20382a

commit bd0a325b6a263ae9dd9107d3476b1a594f20382a
Author: Florian Weimer <fweimer@redhat.com>
Date:   Wed Jun 5 14:02:05 2019 +0200

    malloc: Fix warnings in tests with GCC 9
    
    This is a partial backport of test changes in commit
    9bf8e29ca136094f73f69f725f15c51facc97206 ("malloc: make malloc fail
    with requests larger than PTRDIFF_MAX (BZ#23741)"), without the
    actual functionality changes.

Diff:
---
 ChangeLog                     |  7 +++++++
 malloc/tst-malloc-too-large.c | 39 +++++++++++++++++++++++++++++++++++++++
 malloc/tst-memalign.c         | 10 ++++++++++
 3 files changed, 56 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index f4586d3..6e6ff73 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2019-04-18  Adhemerval Zanella  <adhemerval.zanella@linaro.org>
+
+	* malloc/tst-memalign.c (do_test): Disable
+	-Walloc-size-larger-than= around tests of malloc with negative
+	sizes.
+	* malloc/tst-malloc-too-large.c (do_test): Likewise.
+
 2019-05-22  Wilco Dijkstra  <wdijkstr@arm.com>
 
 	[BZ #24531]
diff --git a/malloc/tst-malloc-too-large.c b/malloc/tst-malloc-too-large.c
index 15e25f5..51d42ce 100644
--- a/malloc/tst-malloc-too-large.c
+++ b/malloc/tst-malloc-too-large.c
@@ -72,13 +72,28 @@ test_large_allocations (size_t size)
   void * ptr_to_realloc;
 
   test_setup ();
+  DIAG_PUSH_NEEDS_COMMENT;
+#if __GNUC_PREREQ (7, 0)
+  /* GCC 7 warns about too-large allocations; here we want to test
+     that they fail.  */
+  DIAG_IGNORE_NEEDS_COMMENT (7, "-Walloc-size-larger-than=");
+#endif
   TEST_VERIFY (malloc (size) == NULL);
+#if __GNUC_PREREQ (7, 0)
+  DIAG_POP_NEEDS_COMMENT;
+#endif
   TEST_VERIFY (errno == ENOMEM);
 
   ptr_to_realloc = malloc (16);
   TEST_VERIFY_EXIT (ptr_to_realloc != NULL);
   test_setup ();
+#if __GNUC_PREREQ (7, 0)
+  DIAG_IGNORE_NEEDS_COMMENT (7, "-Walloc-size-larger-than=");
+#endif
   TEST_VERIFY (realloc (ptr_to_realloc, size) == NULL);
+#if __GNUC_PREREQ (7, 0)
+  DIAG_POP_NEEDS_COMMENT;
+#endif
   TEST_VERIFY (errno == ENOMEM);
   free (ptr_to_realloc);
 
@@ -135,7 +150,13 @@ test_large_aligned_allocations (size_t size)
   for (align = 1; align <= pagesize; align *= 2)
     {
       test_setup ();
+#if __GNUC_PREREQ (7, 0)
+      DIAG_IGNORE_NEEDS_COMMENT (7, "-Walloc-size-larger-than=");
+#endif
       TEST_VERIFY (memalign (align, size) == NULL);
+#if __GNUC_PREREQ (7, 0)
+      DIAG_POP_NEEDS_COMMENT;
+#endif
       TEST_VERIFY (errno == ENOMEM);
 
       /* posix_memalign expects an alignment that is a power of 2 *and* a
@@ -151,7 +172,13 @@ test_large_aligned_allocations (size_t size)
       if ((size % align) == 0)
         {
           test_setup ();
+#if __GNUC_PREREQ (7, 0)
+	  DIAG_IGNORE_NEEDS_COMMENT (7, "-Walloc-size-larger-than=");
+#endif
           TEST_VERIFY (aligned_alloc (align, size) == NULL);
+#if __GNUC_PREREQ (7, 0)
+	  DIAG_POP_NEEDS_COMMENT;
+#endif
           TEST_VERIFY (errno == ENOMEM);
         }
     }
@@ -159,11 +186,23 @@ test_large_aligned_allocations (size_t size)
   /* Both valloc and pvalloc return page-aligned memory.  */
 
   test_setup ();
+#if __GNUC_PREREQ (7, 0)
+  DIAG_IGNORE_NEEDS_COMMENT (7, "-Walloc-size-larger-than=");
+#endif
   TEST_VERIFY (valloc (size) == NULL);
+#if __GNUC_PREREQ (7, 0)
+  DIAG_POP_NEEDS_COMMENT;
+#endif
   TEST_VERIFY (errno == ENOMEM);
 
   test_setup ();
+#if __GNUC_PREREQ (7, 0)
+  DIAG_IGNORE_NEEDS_COMMENT (7, "-Walloc-size-larger-than=");
+#endif
   TEST_VERIFY (pvalloc (size) == NULL);
+#if __GNUC_PREREQ (7, 0)
+  DIAG_POP_NEEDS_COMMENT;
+#endif
   TEST_VERIFY (errno == ENOMEM);
 }
 
diff --git a/malloc/tst-memalign.c b/malloc/tst-memalign.c
index a6a9140..e799751 100644
--- a/malloc/tst-memalign.c
+++ b/malloc/tst-memalign.c
@@ -21,6 +21,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <unistd.h>
+#include <libc-diag.h>
 
 static int errors = 0;
 
@@ -41,9 +42,18 @@ do_test (void)
 
   errno = 0;
 
+  DIAG_PUSH_NEEDS_COMMENT;
+#if __GNUC_PREREQ (7, 0)
+  /* GCC 7 warns about too-large allocations; here we want to test
+     that they fail.  */
+  DIAG_IGNORE_NEEDS_COMMENT (7, "-Walloc-size-larger-than=");
+#endif
   /* An attempt to allocate a huge value should return NULL and set
      errno to ENOMEM.  */
   p = memalign (sizeof (void *), -1);
+#if __GNUC_PREREQ (7, 0)
+  DIAG_POP_NEEDS_COMMENT;
+#endif
 
   save = errno;