About debugging symbols

Most programs and libraries by default are compiled with debugging symbols (gcc option -g) Let me explain what these debugging symbols are and why you may not want them.

A program compiled with debugging symbols means a user can run a program or library through a debugger and the debugger's output will be user friendly. These debugging symbols also enlarge the program or library significantly.

Before you start wondering whether these debugging symbols really make a big difference, here are some statistics. Use them to draw your own conclusion.

Sizes vary depending on which compiler was used and which C library version was used to link dynamic programs against, but results will be similar if you compare programs with and without debugging symbols. After I was done with this chapter and stripped all debugging symbols from all LFS binaries I regained a little over 102 MB of disk space. Quite the difference.

To remove debugging symbols from a binary (must be an a.out or ELF binary) run strip --strip-debug filename. Wild cards can be used to strip debugging symbols from multiple files (use something like strip --strip-debug $LFS/usr/bin/*). Most people will probably never use a debugger on software, so by removing those symbols a lot of disk space can be regained.

You might find additional information in the optimization hint which can be found at http://cvs.linuxfromscratch.org/index.cgi/hints/.