1 files changed, 46 insertions, 0 deletions
diff --git a/gcc/testsuite/gfortran.dg/interface_4.f90 b/gcc/testsuite/gfortran.dg/interface_4.f90
new file mode 100644
index 000000000..8f6c3317e
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/interface_4.f90
@@ -0,0 +1,46 @@
+! { dg-do run }
+! Tests the fix for the interface bit of PR29975, in which the
+! interfaces bl_copy were rejected as ambiguous, even though
+! they import different specific interfaces.
+!
+! Contributed by Joost VandeVondele <jv244@cam.ac.uk> and
+! simplified by Tobias Burnus <burnus@gcc.gnu.org>
+!
+SUBROUTINE RECOPY(N, c)
+  real, INTENT(IN) :: N
+  character(6) :: c
+  c = "recopy"
+END SUBROUTINE RECOPY
+
+MODULE f77_blas_extra
+PUBLIC :: BL_COPY
+INTERFACE BL_COPY
+  MODULE PROCEDURE SDCOPY
+END INTERFACE BL_COPY
+CONTAINS
+   SUBROUTINE SDCOPY(N, c)
+    INTEGER, INTENT(IN) :: N
+    character(6) :: c
+    c = "sdcopy"
+   END SUBROUTINE SDCOPY
+END MODULE f77_blas_extra
+
+MODULE f77_blas_generic
+INTERFACE BL_COPY
+   SUBROUTINE RECOPY(N, c)
+    real, INTENT(IN) :: N
+    character(6) :: c
+   END SUBROUTINE RECOPY
+END INTERFACE BL_COPY
+END MODULE f77_blas_generic
+
+program main
+  USE f77_blas_extra
+  USE f77_blas_generic
+  character(6) :: chr
+  call bl_copy(1, chr)
+  if (chr /= "sdcopy") call abort ()
+  call bl_copy(1.0, chr)
+  if (chr /= "recopy") call abort ()  
+end program main
+! { dg-final { cleanup-modules "f77_blas_generic f77_blas_extra" } }