https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63661
howarth at bromo dot med.uc.edu changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |howarth at bromo dot med.uc.edu --- Comment #5 from howarth at bromo dot med.uc.edu --- Interestingly, I find on Yosemite that the system gcc produces... % gcc -O0 -g -o test_mathieu test_mathieu.c -lm && ./test_mathieu loop -2.35802 loop 2 loop 2 loop 2 loop 2 for -O0/-O1/-O2 when -g is used.