c++ - How to remove *ALL* unused symbols from a shared library? -


i have code need compile shared library , remove unused code from, can't find proper solution. here simple example:

// test.cpp, compiled gcc -fpic -shared -fvisibility=hidden #include <stdio.h> class foo {     void bar(); }; void foo::bar() { printf("hello"); } // unused , should removed // i'm using printf("hello") can detect symbols `strings`  __attribute__((visibility("default"))) void test() {} // function "used"

-fvisibility=hidden makes functions hidden default, , manually mark public functions __attribute__((visibility("default"))). however, hidden functions not removed unless marked static (which can't c++ methods, obviously).

no matter do, gcc keep void foo::bar() , hello around. there way remove these symbols without hacking compiler? (yes, considering @ point!)

thanks!

compile flag -ffunction-sections. link -wl,--gc-sections. think can achieved lto, i'm not sure of details.

note public symbols in dylib considered live. hidden symbols stripped way.


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