CI-unixish.yml: added callgrind runs with `-O3` and LTO by firewave · Pull Request #577 · cppcheck-opensource/simplecpp

This is to make sure that we (well, me) do not try to mess with code which can actually be optimized by the compiler.

From my local system with CXX=g++ VALGRIND_TOOL=callgrind SIMPLECPP_PATH=simplecpp-1.5.1 ./selfcheck.sh:

g++ -O2 - 66,196,507 / 1,217,069,685
g++ -O2 -flto - 64,854,450 / 1,185,122,059
g++ -O3 - 65,023,794 / 1,198,427,777
g++ -O3 -flto - 65,153,503 / 1,190,654,841
clang++ -O2 - 67,422,122 / 1,227,600,090
clang++ -O2 -flto - 66,823,868 / 1,213,656,996
clang++ -O3 - 65,293,400 / 1,177,431,242
clang++ -O3 -flto - 64,801,161 / 1,164,063,469

The differences could well just be inaccuracies within callgrind but I have not looked into it yet.