1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
|
! { dg-do run }
! { dg-options "-fcray-pointer -ffloat-store" }
!
! Test the fix for PR36528 in which the Cray pointer was not passed
! correctly to 'euler' so that an undefined reference to fcn was
! generated by the linker.
!
! Reported by Tobias Burnus <burnus@gcc.gnu.org>
! from http://groups.google.com/group/comp.lang.fortran/msg/86b65bad78e6af78
!
real function p1(x)
real, intent(in) :: x
p1 = x
end
real function euler(xp,xk,dx,f)
real, intent(in) :: xp, xk, dx
interface
real function f(x)
real, intent(in) :: x
end function
end interface
real x, y
y = 0.0
x = xp
do while (x .le. xk)
y = y + f(x)*dx
x = x + dx
end do
euler = y
end
program main
interface
real function p1 (x)
real, intent(in) :: x
end function
real function fcn (x)
real, intent(in) :: x
end function
real function euler (xp,xk,dx,f)
real, intent(in) :: xp, xk ,dx
interface
real function f(x)
real, intent(in) :: x
end function
end interface
end function
end interface
real x, xp, xk, dx, y, z
pointer (pfcn, fcn)
pfcn = loc(p1)
xp = 0.0
xk = 1.0
dx = 0.0005
y = 0.0
x = xp
do while (x .le. xk)
y = y + fcn(x)*dx
x = x + dx
end do
z = euler(0.0,1.0,0.0005,fcn)
if (abs (y - z) .gt. 1e-6) call abort
end
|
