[Bug middle-end/66345] [5/6 Regression] internal compiler error: Segmentation fault

["trippels at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66345

Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |NEW
          Component|c                           |middle-end
      Known to work|                            |4.8.4, 4.9.2
            Summary|internal compiler error:    |[5/6 Regression] internal
                   |Segmentation fault --       |compiler error:
                   |raidctl.c 'do_meter'        |Segmentation fault
      Known to fail|                            |5.0, 6.0

--- Comment #4 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
markus@x4 tmp % cat raidctl.i
extern int snprintf(char *, unsigned long, const char *, ...);
const char a[] = "";
int b;
void
get_bar () { snprintf (0, 0, "%s", &a[b]); }

markus@x4 tmp % gcc -c -O2 raidctl.i
raidctl.i: In function ‘get_bar’:
raidctl.i:5:1: internal compiler error: tree check: expected integer_cst, have
negate_expr in decompose, at tree.h:4929
 get_bar () { snprintf (0, 0, "%s", &a[b]); }
 ^
0xd3447c tree_check_failed(tree_node const*, char const*, int, char const*,
...)
        ../../gcc/gcc/tree.c:9352
0x58db55 tree_check(tree_node const*, char const*, int, char const*, tree_code)
        ../../gcc/gcc/tree.h:3113
0x58db55 wi::int_traits<tree_node const*>::decompose(long*, unsigned int,
tree_node const*)
        ../../gcc/gcc/tree.h:4929
0xd39d2a wi::int_traits<tree_node const*>::decompose(long*, unsigned int,
tree_node const*)
        ../../gcc/gcc/tree.h:3060
0xd39d2a wide_int_ref_storage<false>::wide_int_ref_storage<tree_node
const*>(tree_node const* const&, unsigned int)
        ../../gcc/gcc/wide-int.h:957
0xd39d2a generic_wide_int<wide_int_ref_storage<false>
>::generic_wide_int<tree_node const*>(tree_node const* const&, unsigned int)
        ../../gcc/gcc/wide-int.h:733
0xd39d2a bool wi::eq_p<tree_node const*, int>(tree_node const* const&, int
const&)
        ../../gcc/gcc/wide-int.h:1715
0xd39d2a tree_int_cst_sgn(tree_node const*)
        ../../gcc/gcc/tree.c:7239
0xd3a95e compare_tree_int(tree_node const*, unsigned long)
        ../../gcc/gcc/tree.c:7448
0x85e27c gimple_fold_builtin_snprintf
        ../../gcc/gcc/gimple-fold.c:2543
0x85e27c gimple_fold_builtin
        ../../gcc/gcc/gimple-fold.c:2954
0x8604b0 gimple_fold_call
        ../../gcc/gcc/gimple-fold.c:3182
0x8604b0 fold_stmt_1
        ../../gcc/gcc/gimple-fold.c:3677
0xbf86b7 execute
        ../../gcc/gcc/tree-ssa-forwprop.c:2350
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Please include the complete backtrace with any bug report.
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug gcov-profile/66319] [6 Regression] gcov-tool.c:84:65: error: invalid conversion from 'int (*)(const c har*, const stat*, int, FTW*)' to 'int (*)(const char*, const stat*, int, FTW)'
Date: Sat, 30 May 2015 18:56:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idf319

--- Comment #3 from John David Anglin <danglin at gcc dot gnu.org> ---
_HPUX_SOURCE is predefined for c++.  This results in
_INCLUDE_XOPEN_SOURCE_EXTENDED being defined but _XOPEN_SOURCE_EXTENDED
is not predefined (see hunk in comment #1).  This behavior dates back
to this patch:
https://gcc.gnu.org/ml/gcc-patches/2005-05/msg00589.html

The HP-UX "ftw.h" header appears to be inconsistent in its use of the two
defines, but I don't know the history.

It seems _XOPEN_SOURCE and _XOPEN_SOURCE_EXTENDED need to be predefined
when _HPUX_SOURCE is predefined for consistency with current standards.

This will happen with current hpux compilers as long as flag_iso is not
set, so I think gnu++98 will work.