207. Use compiler options to catch the use of uninitialized variables.#

topic: Compiling

Note

This tip is a draft1.

To catch the use of uninitialized variables, initialize real variables to signalling NaN and integers to -999 and trap NaNs at run time with

gfortran -g -ffpe-trap=invalid,overflow -finit-real=snan -finit-integer=-999 -fbacktrace a.f90

For ifort see



1

From the perspective of FortranTip Browser, “draft” means that it hasn’t been edited for formatting, hasn’t had corresponding Fortran programs added, the text content hasn’t been enhanced, etc. Draft texts are extracted from the corresponding Tweet using the Twitter API.