compiler can only use fortify options when some level of optimization is
on, otherwise it ends up sending some warnings.
warning: _FORTIFY_SOURCE requires compiling with optimization (-O) [-W#warnings]
this is usually OK, since -O<level> would be added via CFLAGS to
compiler cmdline in normal compile stages, however during configure
there are problems when CC,CPP,CXX are probed alone in configure tests
which results in above warning, which confuses the configure results and
autotools 2.70+ detects it as error e.g.
configure:17292: error: C preprocessor "riscv32-yoe-linux-clang -target riscv32-yoe-linux -mlittle-endian -mno-relax -Qunused-arguments -fstack-protector-strong -D_FORTIFY_SOURCE=2 -Wformat -Wformat-security -Werror=format-security --sysroot=/mnt/b/yoe/master/build/tmp/work/riscv32-yoe-linux/ndpi/3.4-r0/recipe-sysroot -E" fails sanity check
See `config.log' for more details
therefore adding a -O ( which actually is -O1 ) to lcl_maybe_fortify
means we can properly test these configure tests and real -O<level> will
still override -O added here, so overrall behavior improves
Signed-off-by: Khem Raj <raj.khem@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
