[Bug 619934] Re: gcc fails to compile completely valid code with -Wall -Werror

[Matthias Klose]

see fprintf(3):

   The conversion specifier
       m      (Glibc extension.)  Print output of strerror(errno).  No argument is required.


** Changed in: gcc-defaults (Ubuntu)
       Status: Confirmed => Invalid

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https://bugs.launchpad.net/bugs/619934

Title:
  gcc fails to compile completely valid code with -Wall -Werror

Status in The GNU Compiler Collection:
  Unknown
Status in “gcc-defaults” package in Ubuntu:
  Invalid

Bug description:
  Binary package hint: gcc

  The symptom:

  cc1: warnings being treated as errors
  relp_listener.c: In function ‘relp_listener_real_run’:
  relp_listener.c:64: error: too many arguments for format
  make: *** [relp_listener.o] Error 1

  The code:

      fprintf(stderr, "error: failed to create socket (%d): %m", errno,
  errno);

  The problem here seems to be that gcc fails to see %m as a format
  specifier, and throws a warning because of -Wall.  However, if the
  code in question is being compiled with -Werror as well, then this
  warning is treated as an error and therefore the compilation is
  aborted, resulting in no build.

  I don't have the ability to determine if this is a problem that
  affects upstream GCC or not, but it's at least present in Ubuntu
  10.04.1 LTS, and being a long term support release, something like
  this should probably be fixed so that people can build their code
  without working around the issue by disabling -Wall or -Werror.

  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: gcc 4:4.4.3-1ubuntu1
  ProcVersionSignature: Ubuntu 2.6.32-24.39-generic 2.6.32.15+drm33.5
  Uname: Linux 2.6.32-24-generic x86_64
  Architecture: amd64
  Date: Wed Aug 18 11:46:42 2010
  InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_US.utf8
   SHELL=/bin/zsh
  SourcePackage: gcc-defaults

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