From bbf8221ec35d6197c8b717940fd0a24d1956e507 Mon Sep 17 00:00:00 2001
From: seyko <seyko2@gmail.com>
Date: Tue, 3 Mar 2015 15:00:13 +0300
Subject: [PATCH] tcc don't understand am extern array of structs.   A
 regression was found trying to compile a linux kernel 2.4.26   which can be
 compiled by tcc 0.9.23

    ///////////////////
    #include <stdio.h>

    // test for a bug:
    // compiler don't understand am extern array of structs
    // $ tcc test_1.c
    // test_1.c:8: error: unknown struct/union/enum

    extern struct FILE std_files[4];

    int main()
    {
	return 0;
    }
    //////////////////

  tcc-current
  /* enum/struct/union declaration. u is either VT_ENUM or VT_STRUCT */
  static void struct_decl(CType *type, int u, int tdef)
  ...
    if (tok != '{') {
        v = tok;
        next();
        /* struct already defined ? return it */
        if (v < TOK_IDENT)
            expect("struct/union/enum name");
        s = struct_find(v);
        if (s) {
            if (s->type.t != a)
                tcc_error("invalid type");
            goto do_decl;
        } else if (tok >= TOK_IDENT && !tdef)
            tcc_error("unknown struct/union/enum");
    } else {
        v = anon_sym++;
    }

  tcc-0.9.23 which don't have such error
  /* enum/struct/union declaration. u is either VT_ENUM or VT_STRUCT */
  static void struct_decl(CType *type, int u)
  ....
    if (tok != '{') {
        v = tok;
        next();
        /* struct already defined ? return it */
        if (v < TOK_IDENT)
            expect("struct/union/enum name");
        s = struct_find(v);
        if (s) {
            if (s->type.t != a)
                error("invalid type");
            goto do_decl;
        }
    } else {
        v = anon_sym++;
    }
---
 tccgen.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tccgen.c b/tccgen.c
index 383b1466..0c3c459a 100644
--- a/tccgen.c
+++ b/tccgen.c
@@ -3148,14 +3148,14 @@ static int parse_btype(CType *type, AttributeDef *ad)
             }
             break;
         case TOK_ENUM:
-            struct_decl(&type1, VT_ENUM, t & VT_TYPEDEF);
+            struct_decl(&type1, VT_ENUM, t & (VT_TYPEDEF | VT_EXTERN));
         basic_type2:
             u = type1.t;
             type->ref = type1.ref;
             goto basic_type1;
         case TOK_STRUCT:
         case TOK_UNION:
-            struct_decl(&type1, VT_STRUCT, t & VT_TYPEDEF);
+            struct_decl(&type1, VT_STRUCT, t & (VT_TYPEDEF | VT_EXTERN));
             goto basic_type2;
 
             /* type modifiers */
-- 
2.11.4.GIT