Makefile

# choose your compiler, e.g. gcc/clang
# example override to clang: make run CC=clang
CC = gcc

# https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html
# https://simonbyrne.github.io/notes/fastmath/
# -Ofast enables all -O3 optimizations.
# Disregards strict standards compliance.
# It also enables optimizations that are not valid for all standard-compliant programs.
# It turns on -ffast-math, -fallow-store-data-races and the Fortran-specific
# -fstack-arrays, unless -fmax-stack-var-size is specified, and -fno-protect-parens.
# It turns off -fsemantic-interposition.
# In our specific application this is *probably* okay to use
.PHONY: runfast
runfast: runqm.c
	$(CC) -Ofast -o runqm runqm.c -lm

# additionally compiles with OpenMP, allowing multithreaded runs
# make sure to also enable multiple threads when running, e.g.:
# OMP_NUM_THREADS=4 ./run out/model.bin
.PHONY: runomp
runomp: runqm.c
	$(CC) -Ofast -fopenmp -march=native runqm.c  -lm  -o runqm