Adam Ruppe wrote:
You save time by recompiling only files that have changes.
But, then the whole program goes through the process again anyway to
perform the optimization. You save a little time in skipping parts of
the front end for unchanged file, but the whole backend process has to
happen anyway.
More importantly, what if you only have access to the object files?
Unless you make those object files with the special -lto switch, you
still don't get the benefit.
Right. I wish to add that when compiling with full optimization on, the
optimization time dominates the compile time. You'd only do LTO when doing a
release build with full optimization, so it essentially is compiling the full
program even when doing an incremental build.
