GCC detail make

CPPFLAGS=-g -pthread -Q -v

You can run gcc -Q -v on a small C file to have GCC dump the options being used. Run it with and without the -O1 option to get the difference between the enabled options.

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http://www.cs.utexas.edu/users/mckinley/380C/lecs/lectures.html https://engineering.purdue.edu/~milind/ece663/2010spring/ https://www.inf.ed.ac.uk/teaching/courses/ct/17-18/ https://bitbucket.org/cdubach/ct-17-18/ [DU chain] https://courses.cs.cornell.edu/cs412/2004sp/lectures/lec36.pdf
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gcc -dM -E - < /dev/null

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