[gcc r13-7431] fortran: Fix ICE on pr96024.f90 on big-endian hosts [PR96024]

[Jakub Jelinek]

https://gcc.gnu.org/g:32c51d0911e8d1bdf3f60bc831794b7932416ccd

commit r13-7431-g32c51d0911e8d1bdf3f60bc831794b7932416ccd
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Fri Jun 9 09:10:29 2023 +0200

    fortran: Fix ICE on pr96024.f90 on big-endian hosts [PR96024]
    
    The pr96024.f90 testcase ICEs on big-endian hosts.  The problem is
    that length->val.integer is accessed after checking
    length->expr_type == EXPR_CONSTANT, but it is a CHARACTER constant
    which uses length->val.character union member instead and on big-endian
    we end up reading constant 0x100000000 rather than some small number
    on little-endian and if target doesn't have enough memory for 4 times
    that (i.e. 16GB allocation), it ICEs.
    
    2023-06-09  Jakub Jelinek  <jakub@redhat.com>
    
            PR fortran/96024
            * primary.cc (gfc_convert_to_structure_constructor): Only do
            constant string ctor length verification and truncation/padding
            if constant length has INTEGER type.
    
    (cherry picked from commit 4cf6e322adc19f927859e0a5edfa93cec4b8c844)

Diff:
---
 gcc/fortran/primary.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gcc/fortran/primary.cc b/gcc/fortran/primary.cc
index 00d35a71770..25a2e70cc65 100644
--- a/gcc/fortran/primary.cc
+++ b/gcc/fortran/primary.cc
@@ -3188,10 +3188,11 @@ gfc_convert_to_structure_constructor (gfc_expr *e, gfc_symbol *sym, gfc_expr **c
 	goto cleanup;
 
       /* For a constant string constructor, make sure the length is
-	 correct; truncate of fill with blanks if needed.  */
+	 correct; truncate or fill with blanks if needed.  */
       if (this_comp->ts.type == BT_CHARACTER && !this_comp->attr.allocatable
 	  && this_comp->ts.u.cl && this_comp->ts.u.cl->length
 	  && this_comp->ts.u.cl->length->expr_type == EXPR_CONSTANT
+	  && this_comp->ts.u.cl->length->ts.type == BT_INTEGER
 	  && actual->expr->ts.type == BT_CHARACTER
 	  && actual->expr->expr_type == EXPR_CONSTANT)
 	{