https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89039
Bug ID: 89039
Summary: Logical read from stream file that is neither 0 nor 1
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: albandil at atlas dot cz
Target Milestone: ---
Related to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=22495
Logicals read from an unformatted stream file that are neither 0 nor 1 behave
like this:
print *, b, .not. b
T T
i.e., both they and their negations evaluate to .true.
This reduces portability of stream files. For example, ifort uses -1 as .true.,
but when such stream files are read by gfortran, the nonzero value is not
converted to gfortran's .true.
(Maybe there is nothing that requires it, I don't know.)
