clang-p2996/flang/test/Semantics/implicit10.f90 at 9325b8da1702238f15f837b6e07f099baf4dcd94 - clang-p2996 - Caio's Gitea

caio/clang-p2996

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Tim Keith 08c7d570d3 [flang] Add options to control IMPLICIT NONE

Add `-fimplicit-none-type-always` to treat each specification-part
like it has `IMPLICIT NONE`. This is helpful for enforcing good Fortran
programming practices. We might consider something similar for
`IMPLICIT NONE(EXTERNAL)` as well.

Add `-fimplicit-none-type-never` to ignore occurrences of `IMPLICIT NONE`
and `IMPLICIT NONE(TYPE)`. This is to handle cases like the one below,
which violates the standard but it accepted by some compilers:
```
subroutine s(a, n)
  implicit none
  real :: a(n)
  integer :: n
end
```

Differential Revision: https://reviews.llvm.org/D85363

2020-08-06 06:48:01 -07:00

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 ! RUN: %S/test_errors.sh %s %t %f18 -fimplicit-none-type-always
 !ERROR: No explicit type declared for 'f'
 function f()
   !ERROR: No explicit type declared for 'x'
   f = x
 end