# gfortran: GNU Fortran (Ubuntu 15.2.0-16ubuntu1) 15.2.0
# glibc:    ldd (Ubuntu GLIBC 2.43-2ubuntu2.3) 2.43
# -O0 libm symbols (THE REFERENCE):
U expf
U powf
U tanhf
# -O2 -ftree-vectorize (WRF's own phys/ setting):
U expf
U powf
U tanhf
U _ZGVbN4vv_powf
# -Ofast -ftree-vectorize:
U cbrtf
U expf
U powf
U tanhf
# positive control (plain expf loop at -Ofast), proves the grep works:
U expf
U _ZGVbN4v_expf
