[Bug 2006505] Re: FTBFS on ppc64el with error: ‘cnt’ may be used uninitialized

[Launchpad Bug Tracker]

This bug was fixed in the package mmc-utils -
0+git20220624.d7b343fd-1ubuntu1

---------------
mmc-utils (0+git20220624.d7b343fd-1ubuntu1) lunar; urgency=medium

  * d/p/0003-fix-warning-on-uninitialized-cnt.patch: Cherry-pick upstream
    patch to fix FTBFS on ppc64el (LP: #2006505).

 -- Nick Rosbrook <nick.rosbrook at canonical.com>  Tue, 07 Feb 2023
15:14:31 -0500

** Changed in: mmc-utils (Ubuntu)
       Status: New => Fix Released

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Title:
  FTBFS on ppc64el with error: ‘cnt’ may be used uninitialized

Status in mmc-utils package in Ubuntu:
  Fix Released
Status in mmc-utils package in Debian:
  Unknown

Bug description:
  Build log: https://launchpadlibrarian.net/648312622/buildlog_ubuntu-
  lunar-ppc64el.mmc-utils_0+git20220624.d7b343fd-1_BUILDING.txt.gz

  Relevant part is this:

  In file included from /usr/include/endian.h:35,
                   from /usr/include/powerpc64le-linux-gnu/sys/types.h:176,
                   from /usr/include/stdlib.h:395,
                   from mmc_cmds.c:21:
  In function ‘__bswap_32’,
      inlined from ‘do_rpmb_write_block’ at mmc_cmds.c:2462:27:
  /usr/include/powerpc64le-linux-gnu/bits/byteswap.h:52:10: error: ‘cnt’ may be used uninitialized [-Werror=maybe-uninitialized]
     52 |   return __builtin_bswap32 (__bsx);
        |          ^~~~~~~~~~~~~~~~~~~~~~~~~
  mmc_cmds.c: In function ‘do_rpmb_write_block’:
  mmc_cmds.c:2439:22: note: ‘cnt’ was declared here
   2439 |         unsigned int cnt;
        |                      ^~~
  cc1: all warnings being treated as errors
  make[1]: *** [Makefile:36: mmc_cmds.o] Error 1
  make[1]: Leaving directory '/<<PKGBUILDDIR>>'
  dh_auto_build: error: make -j4 "INSTALL=install --strip-program=true" returned exit code 2
  make: *** [debian/rules:8: binary-arch] Error 25
  dpkg-buildpackage: error: debian/rules binary-arch subprocess returned exit status 2
  --------------------------------------------------------------------------------

  There is already an upstream fix[1] for this, but Debian has not
  packaged a new version in a bit.

  [1] https://git.kernel.org/pub/scm/utils/mmc/mmc-
  utils.git/commit/?id=5086e7c0de4d0094f8674368a88d931b27589d53

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