re PR fortran/20361 (-fmax-stack-var-size=N not working for equivalence)

fortran/
PR fortran/20361
* trans-array.c (gfc_stack_space_left): Remove unused variable.
(gfc_can_put_var_on_stack): Move to trans-decl.c, remove #if 0'ed
code.
* trans-array.h (gfc_stack_space_left, gfc_can_put_var_on_stack):
Remove declaration / prototype.
* trans-common.c (build_equiv_decl): Give union a name.  Check if
it can be put on the stack.
* trans-decl.c (gfc_stack_space_left): Move function here.
(gfc_build_qualified_array): Fix comment typo.
* trans.h (gfc_put_var_on_stack): Add prototype.

testsuite/
PR fortran/20361
* gfortran.dg/largeequiv_1.f90: New test.

From-SVN: r96352

1 files changed, 27 insertions, 1 deletions

diff --git a/gcc/fortran/trans-decl.c b/gcc/fortran/trans-decl.c
index b81b986..08dd72a 100644
--- a/gcc/fortran/trans-decl.c
+++ b/gcc/fortran/trans-decl.c
@@ -317,6 +317,32 @@ gfc_sym_mangled_function_id (gfc_symbol * sym)
 }
 
 
+/* Returns true if a variable of specified size should go on the stack.  */
+
+int
+gfc_can_put_var_on_stack (tree size)
+{
+  unsigned HOST_WIDE_INT low;
+
+  if (!INTEGER_CST_P (size))
+    return 0;
+
+  if (gfc_option.flag_max_stack_var_size < 0)
+    return 1;
+
+  if (TREE_INT_CST_HIGH (size) != 0)
+    return 0;
+
+  low = TREE_INT_CST_LOW (size);
+  if (low > (unsigned HOST_WIDE_INT) gfc_option.flag_max_stack_var_size)
+    return 0;
+
+/* TODO: Set a per-function stack size limit.  */
+
+  return 1;
+}
+
+
 /* Finish processing of a declaration and install its initial value.  */
 
 static void
@@ -533,7 +559,7 @@ gfc_build_qualified_array (tree decl, gfc_symbol * sym)
 
 
 /* For some dummy arguments we don't use the actual argument directly.
-   Instead we create a local decl and use that.  This allows us to preform
+   Instead we create a local decl and use that.  This allows us to perform
    initialization, and construct full type information.  */
 
 static tree