Functions cannot be called within target
regions unless the also a "target"
version of the function is compiled. The main programs sum(.c|.F90)
calculate
a sum of two vectors using a function my_sum
which is defined externally in
my_sum.c
/ my_mod.F90
. As such, the program does not compile correctly.
Add appropriate declare target
constructs to the code. You can use the
included Makefile
to build the code (make c
or make fortran
).