Fortran: handle expansion of zero-sized array constructors

gcc/fortran/ChangeLog:

	PR fortran/103692
	* array.cc (gfc_expand_constructor): Handle zero-sized array
	constructors.

gcc/testsuite/ChangeLog:

	PR fortran/103692
	* gfortran.dg/pr102520.f90: Adjust error messages.
	* gfortran.dg/pr103692.f90: New test.

3 files changed, 28 insertions, 4 deletions

diff --git a/gcc/fortran/array.cc b/gcc/fortran/array.cc
index 4723043..f1d92e0 100644
--- a/gcc/fortran/array.cc
+++ b/gcc/fortran/array.cc
@@ -1883,6 +1883,9 @@ gfc_expand_constructor (gfc_expr *e, bool fatal)
   gfc_expr *f;
   bool rc;
 
+  if (gfc_is_size_zero_array (e))
+    return true;
+
   /* If we can successfully get an array element at the max array size then
      the array is too big to expand, so we just return.  */
   f = gfc_get_array_element (e, flag_max_array_constructor);
diff --git a/gcc/testsuite/gfortran.dg/pr102520.f90 b/gcc/testsuite/gfortran.dg/pr102520.f90
index 1c98c18..d2ea8f3 100644
--- a/gcc/testsuite/gfortran.dg/pr102520.f90
+++ b/gcc/testsuite/gfortran.dg/pr102520.f90
@@ -5,8 +5,6 @@ program p
   type t
   end type
   type(t), parameter :: a(4)   = shape(1)         ! { dg-error "Incompatible" }
-  type(t), parameter :: b(2,2) = reshape(a,[2,2]) ! { dg-error "Incompatible" }
-  type(t), parameter :: c(2,2) = transpose(b)     ! { dg-error "Unclassifiable" }
+  type(t), parameter :: b(2,2) = reshape(a,[2,2]) ! { dg-error "must be an array" }
+  type(t), parameter :: c(2,2) = transpose(b)     ! { dg-error "must be of rank 2" }
 end
-
-! { dg-error "Different shape for array assignment" " " { target *-*-* } 7 }
diff --git a/gcc/testsuite/gfortran.dg/pr103692.f90 b/gcc/testsuite/gfortran.dg/pr103692.f90
new file mode 100644
index 0000000..9687a3c
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/pr103692.f90
@@ -0,0 +1,23 @@
+! { dg-do compile }
+! { dg-options "-fdump-tree-original" }
+! PR fortran/103692 - ICE in expand_constructor
+! Contributed by G.Steinmetz
+
+program p
+  character(3), parameter :: a(4) = 'abc'
+  character(*), parameter :: b(*) =  (a(2:1))
+  character(*), parameter :: y(*) = [(a(2:1))]
+  character(*), parameter :: u(*) =  a(2:1)
+  character(*), parameter :: v(*) = [a(2:1)]
+  character(*), parameter :: w(-1) = (a(2:1))
+  character(*), parameter :: x(-1) =  a(2:1)
+  character(5), parameter :: c(3,3) = 'def'
+  character(*), parameter :: d(*)   = [(c(2:1,2:))]
+  character(*), parameter :: e(*,*) =  (c(2:1,2:))
+  if (len(b) /= 3 .or. size (b) /= 0) stop 1
+  if (len(y) /= 3 .or. size (y) /= 0) stop 2
+  if (len(d) /= 5 .or. size (d) /= 0) stop 3
+  if (len(e) /= 5 .or. any (shape (e) /= [0,2])) stop 4
+end
+
+! { dg-final { scan-tree-dump-not "_gfortran_stop_numeric" "original" } }