(Adding the OP).
(2) I encountered a curious failure on compilation with the following statement
using integer arithmetic:
n= (m + 4)/5
with the message
Error: Integer division truncated to constant ‘2’ at (1)
[-Werror=integer-division]
f951: all warnings being treated as errors
This error only occurs if both (a) the value of "m" would lead to a truncation (say 7
but not 6), and ALSO if (b) the value of "m" was set in a PARAMETER statement. I can work
my way around this difficulty by rewriting the statement as:
n= int ((1.0*m + 4)/5)
but it does seem clumsy.
This warning was introduced because people all to often would write code
like x = 3/7 and expect the same result as for x = 3./7.. As often,
it is a delicate balance between warning too much and too little.
Because this is an error, I assume you use -Werror. The error
message gives you a hint, although an indirect one, of how to
downgrade this particular error to a warning: Compile with
$ gfortran -Wall -Werror -Wno-error=integer-division foo.f90
and you will get a warning again.
If you want to still have an error for other unintended cases
you may have missed, you can use
n = (m+4-mod(m+4,5))/5
which, while also admittedly clumsy, will be evaluated at compile-time
if m is a parameter.
Hope this helps.
Best regards
Thomas
