Comment 7 for bug 1317307

For clarification purposes, I'm attaching interdiff output between the updated version of the gcc-default-ssp.diff and the version in gcc 4.9.0-4ubuntu2 currently in utopic-proposed. The differences are threefold:

  1) update the definition of the SSP_DEFAULT_SPEC macro to default to -fstack-protector-strong, and to disable that definition additionally if -fstack-protector is given on the command line.

  2) Adjust the invocation documentation to inform users that the default is now -fstack-protector-strong by default.

  3) Adjust in the invocation documentation the location of the description of the default minimum ssp-buffer-size to actually fall under the section for 'ssp-buffer-size' as due to fuzzy patching, it was getting applied incorrectly under the section on 'min-size-for-stack-sharing'

(The reason we lowered the minimum buffer size in Ubuntu 10.10 that gcc would consider for determining whether to apply stack protection to that function or not was to get a few more functions covered by -fstack-protector without going to -fstack-protector-all and paying the costs thereof.)