问题
Why is there different behavior between ifort and gfortran here? Compiled with ifort it returns false and with gfortran true. I ran into this problem before in my own code and decided to use a subroutine instead, but a recent question made me question this behavior.
function allocateArray(size)
integer, allocatable, dimension(:) :: allocateArray
integer size
allocate(allocateArray(size))
end function allocateArray
From the main program
integer, allocatable, dimension(:) :: a
a = allocateArray(10)
print *, allocated(a)
回答1:
When compiling with ifort before version 17.0.1, the default behaviour is for the compiler not to use the Fortran rules for automatic allocation on intrinsic assignment.
You will need to use an option like -assume realloc-lhs.
来源：https://stackoverflow.com/questions/22313883/allocatable-array-valued-function-gfortran-vs-ifort