[Mesa-dev] [Bug 108082] warning: unknown warning option '-Wno-format-truncation' [-Wunknown-warning-option]

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Thu Sep 27 03:01:32 UTC 2018


            Bug ID: 108082
           Summary: warning: unknown warning option
                    '-Wno-format-truncation' [-Wunknown-warning-option]
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: All
            Status: NEW
          Keywords: bisected, regression
          Severity: normal
          Priority: medium
         Component: Other
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: vlee at freedesktop.org
        QA Contact: mesa-dev at lists.freedesktop.org
                CC: emil.l.velikov at gmail.com, fdo-bugs at engestrom.ch

These warning messages are appearing with clang.

warning: unknown warning option '-Wno-format-truncation'

Introduced with this commit.

commit 97ae5a858d2a2da9144ea9793b67b360a3a7c5fa
Author: Eric Engestrom <eric.engestrom at intel.com>
Date:   Fri Sep 21 11:42:38 2018 +0100

    meson+autotools: get rid of spammy GCC warning -Wformat-truncation

    That warning fires every time a string function takes an argument that
    could possibly be longer than its max output, which triggers all over
    the place, especially when working with file paths ("what if every file
    path is MAX_PATH long?" is what GCC is saying, which is really annoying
    when we *know* that "/dev/dri/cardN" is not gonna be 4096 char long and
    it's safe to store it in a 32-char array).

    Anyway, we either add a ton of dead code all over the place to make GCC
    happy, or we get rid of its spam. I chose the latter.

    Signed-off-by: Eric Engestrom <eric.engestrom at intel.com>
    Reviewed-by: Emil Velikov <emil.l.velikov at gmail.com>

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