Disable C99 VLA when alloca is unavailable.

* Disable C99 VLA detection when alloca is unavailable and protect the
  new reference to TOK_alloca in decl_initializer in order to compile
  and run for architecture without working alloca.

  Not all code of C99 VLA is commented as it would required many ifdef
  stanza. Just the detection is commented so that VT_VLA is never set
  any type and the C99 VLA code is compiled but never called. However
  vpush_global_sym(&func_old_type, TOK_alloca) in decl_initializer needs
  to be protected by an ifdef stanza as well because it uses TOK_alloca.

* include alloca and C99 VLA tests according to availability of
  TOK_alloca instead of relying on the current architecture

1 files changed, 8 insertions, 0 deletions

diff --git a/tccgen.c b/tccgen.c
index 7fb7cfe..f573dff 100644
--- a/tccgen.c
+++ b/tccgen.c
@@ -3162,17 +3162,21 @@ static void post_type(CType *type, AttributeDef *ad)
         n = -1;
         if (tok != ']') {
             gexpr();
+#ifdef TOK_alloca
             if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
+#endif
                 n = vtop->c.i;
                 last_vtop = vtop;
                 if (n < 0)
                     error("invalid array size");
+#ifdef TOK_alloca
             } else {
                 if (!is_integer_btype(vtop->type.t & VT_BTYPE))
                     error("size of variable length array should be an integer");
                 type->t |= VT_VLA;
                 last_vtop = vtop;
             }
+#endif
         }
         skip(']');
         /* parse next post type */
@@ -4864,7 +4868,11 @@ static void decl_initializer(CType *type, Section *sec, unsigned long c,
         int a;
         CValue retcval;
 
+/* No need to coment all the block as it will never be called without
+   TOK_alloca defined (See ifdef TOK_alloca stanza in post_type */
+#ifdef TOK_alloca
         vpush_global_sym(&func_old_type, TOK_alloca);
+#endif
         vla_runtime_type_size(type, &a);
         gfunc_call(1);