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Adding -O can be troublesome in some packages where it may override the O<n> specified by CFLAGS, this can be due to configure processing of CFLAGS and munging them into new values in Makefiles, which is contructed from CC and CFLAGS passed by bitbake environment. Problem arises if the sequence is altered, which seems to be the case in some packages e.g. ncurses, where the value from CC variable is added last and thus overrides -O<n> coming from CFLAGS, Therefore grok the value from SELECTED_OPTIMIZATION and append the appropriate -O<level> flag to lcl_maybe_fortify so the level does not change inaderdantly. Since we do not use -O0 anymore there is no point of checking for DEBUG_BUILD since it uses -Og now which works fine with -D_FORTIFY_SOURCE=2, so check for optlevel O0 instead (From OE-Core rev: 9571a18f7d15b3bffafc2e277ab90a21d6763697) Signed-off-by: Khem Raj <raj.khem@gmail.com> Cc: Anuj Mittal <anuj.mittal@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>