It is unknown if gcc uses the O3 optimization levels passed to the compilation of individual cpp files, or if it needs O3 passed to the linker as well. The hash of the final binaries are different, thus O3 is passed to the linker.
It is unknown if gcc uses the O3 optimization levels passed to the compilation of individual cpp files, or if it needs O3 passed to the linker as well. The hash of the final binaries are different, thus O3 is passed to the linker.