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Date: Mon, 15 Mar 2010 20:44:00 -0000
Subject: [Bug c/43384]  New: [4.3/4.4/4.5 Regression] ICE: Segmentation fault with invalid K&R-like declaration related to labels
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From: "zsojka at seznam dot cz" <gcc-bugzilla@gcc.gnu.org>
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Command line:
gcc testcase.c

----- testcase.c -----
void c_direct(p)
void *p = &&lab;
{}
----------------------

3.3.6 gives:
$ gcc-3.3.6 testcase.c
testcase.c: In function `c_direct':
testcase.c:2: error: parameter `p' is initialized
testcase.c:2: error: label `lab' used but not defined

3.4.6 and newer give:
$ /mnt/svn/gcc-trunk/binary-157460-lto/bin/gcc testcase.c
testcase.c: In function 'c_direct':
testcase.c:2:1: error: parameter 'p' is initialized
testcase.c:2:1: internal compiler error: Segmentation fault
(or bail out, without checking)

Valgrind on trunk outputs:
$ valgrind --trace-children=yes /mnt/svn/gcc-trunk/binary-157460-lto/bin/gcc
testcase.c
==5200== Invalid read of size 4
==5200==    at 0x49B7EF: bind (c-decl.c:604)
==5200==    by 0x49B9C8: bind_label (c-decl.c:670)
==5200==    by 0x4A1A68: lookup_label (c-decl.c:3027)
==5200==    by 0x4F6035: finish_label_address_expr (c-common.c:5659)
==5200==    by 0x50C90C: c_parser_unary_expression (c-parser.c:5141)
==5200==    by 0x50D262: c_parser_cast_expression (c-parser.c:5043)
==5200==    by 0x50D404: c_parser_binary_expression (c-parser.c:4859)
==5200==    by 0x50DA5C: c_parser_conditional_expression (c-parser.c:4645)
==5200==    by 0x50DF6E: c_parser_expr_no_commas (c-parser.c:4565)
==5200==    by 0x511ADF: c_parser_declaration_or_fndef (c-parser.c:3073)
==5200==    by 0x511D75: c_parser_declaration_or_fndef (c-parser.c:1335)
==5200==    by 0x5163B7: c_parse_file (c-parser.c:1005)
==5200==  Address 0x28 is not stack'd, malloc'd or (recently) free'd


-- 
           Summary: [4.3/4.4/4.5 Regression] ICE: Segmentation fault with
                    invalid K&R-like declaration related to labels
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: zsojka at seznam dot cz
  GCC host triplet: x86_64-pc-linux-gnu
GCC target triplet: x86_64-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43384