[Bug 1317305] Re: -Wno-format is not honored

[Steve Beattie]

And here's the version for gcc-4.8, verified to address the issue there,
suitable for an SRU to trusty (and saucy).

** Patch added: "gcc-default-format-security patch for gcc-4.8"
   https://bugs.launchpad.net/ubuntu/+source/gcc-4.9/+bug/1317305/+attachment/4113556/+files/gcc-default-format-security.diff

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Title:
  -Wno-format is not honored

Status in “gcc-4.8” package in Ubuntu:
  New
Status in “gcc-4.9” package in Ubuntu:
  New

Bug description:
  Due to the way the gcc-default-format-security patch is implemented in
  gcc-4.8, disabling format warnings does not work:

    $ cat format-extra-args.c
    #include <stdio.h>

    /* printf extra arguments example */
    int main(void)
    {
          printf("%s\n", "argument 1", "argument 2");

          return 0;
    }
    $ gcc -Wall -O2 -o format-off format-extra-args.c -Wno-format
    format-extra-args.c: In function 'main':
    format-extra-args.c:12:2: warning: too many arguments for format [-Wformat-extra-args]
      printf("%s\n", "argument 1", "argument 2");
      ^

  Earlier versions of gcc allowed disabling warnings correctly.

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