Trying to get my changes upstream

As noted before my optimization was to change the compiler flag from -O2 to -O3. This increased the speed with 11% on x86_64. During the testfase of this optimization I changed the compiler flags in the Makefile itself. If I wanted this to get committed in the community I'd have to find the place where the makefiles are being created.

This would normally be the configure file. However I could not find where the flags were set for the makefiles which I thought was very strange because I am very sure that when you configure and make the program, it compiles with the -O2 flag.

I used grep to find files where -O2 would be used, and the only file it found was an instructions file of how you can manually add -O2 while configuring, not as a standard.

Then I tried using grep to find CFLAGS and where they would be defined. What I discovered is that they use a pthread library which helps find the right flags for compilation. (https://manned.org/pthread-config/b1cf9868). I quoted this from the md5deep documentation:

#   This macro figures out how to build C programs using POSIX threads. It
#   sets the PTHREAD_LIBS output variable to the threads library and linker
#   flags, and the PTHREAD_CFLAGS output variable to any special C compiler
#   flags that are needed.

I did not know how to manipulate the pthread configuration so it would always use -O3. I did read in their instructions that they had an email address for questions or remarks on the compiler options in the README file. It was however not in the file, so I could not contact them personally either.

On that note I'm sad to share that I could not get the right flags in the configure step. This means I could not commit anything to the github project because I could not contact them and ask for help or an explanation.