Re: [COMMITTED] malloc: Fix mallinfo deprecation declaration

[Vaseeharan Vinayagamoorthy <Vaseeharan.Vinayagamoorthy@arm.com>]

I am seeing these deprecated-declaration errors when compiling ggc-common.c.

/src/gcc/gcc/ggc-common.c:1018:62: error: 'mallinfo mallinfo()' is deprecated [-Werror=deprecated-declarations]
 1018 |     fprintf (stderr," {heap %luk}", (unsigned long)(mallinfo().arena / 1024));
      |                                                              ^
In file included from /src/gcc/gcc/system.h:736,
                 from src/gcc/gcc/ggc-common.c:25:
/usr/include/malloc.h:118:24: note: declared here
  118 | extern struct mallinfo mallinfo (void) __THROW __MALLOC_DEPRECATED;

This is breaking the build for these configurations:
BUILD: aarch64-none-linux-gnu
HOST: aarch64-none-linux-gnu
TARGET: aarch64-none-linux-gnu

BUILD: arm-none-linux-gnueabihf
HOST: arm-none-linux-gnueabihf
TARGET: arm-none-linux-gnueabihf

Glibc is being bootstrapped in these configurations.

Regards
Vasee



On 31/08/2020, 18:47, "Libc-alpha on behalf of Adhemerval Zanella via Libc-alpha" <libc-alpha-bounces@sourceware.org on behalf of libc-alpha@sourceware.org> wrote:

    It fixes the build issue below introduced by e3960d1c57e57 (Add
    mallinfo2  function that support sizes >= 4GB).  It moves the
    __MALLOC_DEPRECATED to the usual place for function attributes:

      In file included from ../include/malloc.h:3,
                       from ../sysdeps/x86_64/multiarch/../../../test-skeleton.c:31,
                       from ../sysdeps/x86_64/multiarch/test-multiarch.c:96:
      ../malloc/malloc.h:118:1: error: empty declaration [-Werror]
        118 | __MALLOC_DEPRECATED;

    It also adds the required deprecated warning suppression on the tests.

    Checked on x86_64-linux-gnu.
    ---
     malloc/malloc.h                 | 3 +--
     malloc/tst-malloc-tcache-leak.c | 7 +++++++
     malloc/tst-mxfast.c             | 7 +++++++
     3 files changed, 15 insertions(+), 2 deletions(-)

    diff --git a/malloc/malloc.h b/malloc/malloc.h
    index e25b33462a..b2371f7704 100644
    --- a/malloc/malloc.h
    +++ b/malloc/malloc.h
    @@ -115,8 +115,7 @@ struct mallinfo2
     };

     /* Returns a copy of the updated current mallinfo. */
    -__MALLOC_DEPRECATED;
    -extern struct mallinfo mallinfo (void) __THROW;
    +extern struct mallinfo mallinfo (void) __THROW __MALLOC_DEPRECATED;

     /* Returns a copy of the updated current mallinfo. */
     extern struct mallinfo2 mallinfo2 (void) __THROW;
    diff --git a/malloc/tst-malloc-tcache-leak.c b/malloc/tst-malloc-tcache-leak.c
    index f6f6023b5a..2a7a0646c5 100644
    --- a/malloc/tst-malloc-tcache-leak.c
    +++ b/malloc/tst-malloc-tcache-leak.c
    @@ -29,6 +29,7 @@
     #include <malloc.h>
     #include <pthread.h>
     #include <assert.h>
    +#include <libc-diag.h>

     #include <support/check.h>
     #include <support/support.h>
    @@ -72,6 +73,10 @@ do_test (void)
          pthread_t required to run the test.  */
       thread = (pthread_t *) xcalloc (1, sizeof (pthread_t));

    +  /* The test below covers the deprecated mallinfo function.  */
    +  DIAG_PUSH_NEEDS_COMMENT;
    +  DIAG_IGNORE_NEEDS_COMMENT (4.9, "-Wdeprecated-declarations");
    +
       info_before = mallinfo ();

       assert (info_before.uordblks != 0);
    @@ -104,6 +109,8 @@ do_test (void)
       if (info_after.uordblks > (info_before.uordblks + threads))
         FAIL_EXIT1 ("Memory usage after threads is too high.\n");

    +  DIAG_POP_NEEDS_COMMENT;
    +
       /* Did not detect excessive memory usage.  */
       free (thread);
       exit (0);
    diff --git a/malloc/tst-mxfast.c b/malloc/tst-mxfast.c
    index 57b4a0a8dc..8afee0f9d5 100644
    --- a/malloc/tst-mxfast.c
    +++ b/malloc/tst-mxfast.c
    @@ -21,6 +21,7 @@
        the fast bins.  */

     #include <malloc.h>
    +#include <libc-diag.h>
     #include <support/check.h>

     int
    @@ -36,8 +37,14 @@ do_test (void)
       p2 = malloc (512);
       free (p1);

    +  /* The test below covers the deprecated mallinfo function.  */
    +  DIAG_PUSH_NEEDS_COMMENT;
    +  DIAG_IGNORE_NEEDS_COMMENT (4.9, "-Wdeprecated-declarations");
    +
       m = mallinfo ();

    +  DIAG_POP_NEEDS_COMMENT;
    +
       /* This will fail if there are any blocks in the fastbins.  */
       TEST_COMPARE (m.smblks, 0);

    -- 
    2.25.1