Doc: report GCC 13 passes all tests; Feat: impure elemental free procedure

README.md

@@ -68,18 +68,17 @@ summarizes the observed compiler behaviors:
 | :---         |       :---:        | :---                                                |
 | AMD          | N.A. (see Note 1.) | `flang` 13.0.0 (AOCC_3.2.0-Build\#128 2021\_11\_12) |
 | Cray         | >= 3 (see Note 2.) | `ftn` 13.0.1                                        |
-| GCC :trophy: | 0    (see Note 3.) | `gfortran` 13.0.1 20230321 (experimental)           |
+| GCC :trophy: | 0                  | `gfortran` 13.1.0                                   |
 | IBM          | 1                  | `xlf2008_r` 17.1.0 on AIX                           |
 | Intel        | 1                  | `ifort` 2021.7.0 Build 20220726_000000              |
-| LLVM         | N.A. (see Note 4.) | `git` commit `f5253058144aca1e9fcacd` (9/20/2022)   
+| LLVM         | N.A. (see Note 3.) | `git` commit `f5253058144aca1e9fcacd` (9/20/2022)   
 | NAG :trophy: | 0                  | `nagfor` 7.1 Build 7113                             |
 | NVIDIA       | 2                  | `nvfortran` 22.7-0                                  |
 
 **Notes**
 1. Fails to build due to an internal compiler error (ICE).
 2. Fails to build due to `fpm` issue [767]. See [test/README.md#cray] for a lower bound on the Cray compiler test failures.
-3. See [test/README.md#gnu](./test/README.md#gnu) for instructions on building a current GCC from source.
-4. Fails to build due to type finalization not yet being supported.
+3. Fails to build due to polymorphism not yet being supported. However, a refactored version of 10 the compiler tests in [./tests/compiler_test_m.f90] pass when incorporated into the [llvm-test-suite].
 
 See the [test suite README.md](./test/README.md) for more details on each compiler's test
 results.
@@ -144,3 +143,5 @@ class diagram below of the three derived types in Smart-Pointers.
 [767]: https://github.com/fortran-lang/fpm/issues/767
 [test/README.md#cray]: ./test/README.md#cray
 [Sourcery]: https://github.com/sourceryinstitute/sourcery
+[./tests/compiler_test_m.F90]: ./tests/compiler_test_m.F90
+[llvm-test-suite]: https://github.com/llvm/llvm-test-suite

example/user_object_smart_pointer.f90

@@ -26,7 +26,7 @@ module function construct(user_object) result(user_object_ptr)
 
   interface
 
-    module subroutine free(self)
+    impure elemental module subroutine free(self)
       implicit none
       class(user_object_ptr_t), intent(inout) :: self
     end subroutine

src/smart_pointer/sp_resource_m.f90

@@ -11,7 +11,7 @@ module sp_resource_m
 
   abstract interface
 
-    subroutine free_interface(self)
+    impure elemental subroutine free_interface(self)
       import sp_resource_t
       class(sp_resource_t), intent(inout) :: self
     end subroutine

test/README.md

@@ -57,7 +57,7 @@ ftn compile_me_only.f90
 The number of unit test failures for the remainder of the Smart-Pointers test suite is unknown.
 
 ### GCC
-- Version: 13.0.1 20230321 (experimental)
+- Version: 13.1.0
 - Result: 0 test failures.
 ```
  % fpm test