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! { dg-do run }

! { dg-additional-sources f2c_4.c }

! { dg-options "-ff2c -w" }

! Check -ff2c calling conventions

!   Return value of REAL function is promoted to C type double

!   Return value of COMPLEX function is via an extra argument in the

!    calling sequence that points to where to store the return value

!   Addional underscore appended to function name

program f2c_4

  complex c, f2c_4k, f2c_4l

  double complex z, f2c_4m, f2c_4n

  integer i

  ! Promotion of REAL function

  call f2c_4a()

  ! Return COMPLEX arg - call Fortran routines from C

  call f2c_4c()

  call f2c_4e()

  call f2c_4g()

  call f2c_4i()

  !  Return COMPLEX arg - call C routines from Fortran

  c = cmplx(1234.0,5678.0)

  z = dcmplx(1234.0d0,5678.0d0)

  if ( c .ne. f2c_4k(c) )   call abort

  if ( c .ne. f2c_4l(i,c) ) call abort

  if ( z .ne. f2c_4m(z) )   call abort

  if ( z .ne. f2c_4n(i,z) ) call abort

end

real function f2c_4b(x)

  double precision x

  f2c_4b = x

end

complex function f2c_4d(x)

  complex x

  f2c_4d = x

end

complex function f2c_4f(i,x)

  complex x

  integer i

  f2c_4f = x

end

double complex function f2c_4h(x)

  double complex x

  f2c_4h = x

end

double complex function f2c_4j(i,x)

  double complex x

  f2c_4j = x

end