Hi,
I was wondering whether there is a module or skeleton floating around to
deal with Profile Guided Optimization using a cmake build. If this rings
a bell you probably know the sequence (assuming GCC):
- compile using -fprofile-generate
- run a benchmark suite, this generates .gcda files for each object,
which may be placed in a different directory.
- recompile using -fprofile-use
Targetting Ninja, I now use a shell-script that performs
- ninja -t clean my-target
- cmake -DPROFILE_GUIDED_OPTIMIZATION=GENERATE ..
- ninja my-target
- <run benchmark>
- cmake -DPROFILE_GUIDED_OPTIMIZATION=USE ..
- ninja -t clean my-target
- ninja my-target
Where my-target is the time critical sub-project and
PROFILE_GUIDED_OPTIMIZATION is picked up by cmake and sets the compile
and link flags for the affected targets.
This isn't nice. I guess that ideally I'd have a separate build
subdirectory that always uses -fprofile-generate and the main build dir
using -fprofile-use. Does that make sense? Is there an
example/module/...?
Thanks --- Jan
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