Compiler flags which make reverse engineering harder

Recently I read that using specific compiler flags can prevent or make reverse engineering much more complicated. I'm using those flags

-s -O3 -Os -fdata-sections -ffunction-sections -fvisibility=hidden -fvisibility-inlines-hidden -Wl,--gc-sections

Is it enough protection or maybe i used too many flags?I'm using MinGW-W64 x86_64-posix 11.3.0