[Bug build/27575] New: --enable-memory-tagging doesn't work with --enable-tunables=no

["hjl.tools at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27575

            Bug ID: 27575
           Summary: --enable-memory-tagging doesn't work with
                    --enable-tunables=no
           Product: glibc
           Version: 2.33
            Status: NEW
          Severity: normal
          Priority: P2
         Component: build
          Assignee: unassigned at sourceware dot org
          Reporter: hjl.tools at gmail dot com
                CC: carlos at redhat dot com, rearnsha at arm dot com, skpgkp2 at gmail dot com
  Target Milestone: ---

commit 3784dfc0985fc0185cdc79428f624cdd1e03eabf
Author: Richard Earnshaw <rearnsha@arm.com>
Date:   Mon Dec 21 15:03:03 2020 +0000

    malloc: Basic support for memory tagging in the malloc() family

    This patch adds the basic support for memory tagging.

    Various flavours are supported, particularly being able to turn on
    tagged memory at run-time: this allows the same code to be used on
    systems where memory tagging support is not present without neededing

has

+#ifdef USE_MTAG
+  if ((TUNABLE_GET_FULL (glibc, mem, tagging, int32_t, NULL) & 1) != 0)

which fails to build with --enable-tunables=no.

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