"3119369616.qq via Gcc" <gcc@gcc.gnu.org> writes: > To divide functions into sections and then remove unused sections, I must > provide flags "-fdata-sections" and "-ffunction-sections" in GCC and a flag > "--gc-sections" in LD. Most of the build systems don't support these flags so > GCC will generate bigger binaries. > Is it possible to enable this feature without giving any command line > flags manually?
All (at least decent) build systems support passing extra flags to the compiler and linker (e.g. CXXFLAGS="-ffunction-sections"), or passing a custom compiler and linker (which can set those flags, something like CC="gcc -ffunction-sections"). This is how you should be setting such flags. If you're interested in DCE and other size-reducing optimizations, you might also be interested in LTO and -Os. -- Arsen Arsenović
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