2011/3/7 Orna Agmon Ben-Yehuda <ladyp...@gmail.com> > > > On Mon, Mar 7, 2011 at 12:18 PM, Muli Ben-Yehuda <m...@il.ibm.com> wrote: > >> On Mon, Mar 07, 2011 at 12:11:36PM +0200, Erez D wrote: >> >> > I have a function which is not called in a regular way, so gcc >> > thinks it is dead code. however it is not, and i am looking for a >> > way to tell the linker not to remove it. >> >> extern >> >> >> And set the function pointer to a global variable, so that the linker > cannot know if the value is used or not. > This trick I learned from Nadav Har'El worked through many compilers and > linkers over the past decade. >
I wonder if link time optimization[1] would be able to catch this trick and remove the dead code after all. The smarter the compiler become, the smarter we should trick them into unexpected behavior [1] http://gcc.gnu.org/wiki/LinkTimeOptimization
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