bootstrap failure while compiling gcc/tree.c (ICE)

[Brian Sidebotham]

Kaveh R. GHAZI wrote:
> On Fri, 24 Aug 2007, Brian Sidebotham wrote:
> 
>> This ICE is caused by the following patch:
>>
>> 2007-08-10  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
>>
>> 	* system.h (CONST_CAST): New.
>> 	* c-decl.c (c_make_fname_decl): Use it.
>> 	* c-lex.c (cb_ident, lex_string): Likewise.
>> 	* c-typeck.c (free_all_tagged_tu_seen_up_to): Likewise.
>> 	* gcc.c (set_spec, read_specs, for_each_path, execute, do_spec_1,
>> 	give_switch, set_multilib_dir): Likewise.
>> 	* gengtype-parse.c (string_seq, typedef_name): Likewise.
>> 	* passes.c (execute_one_pass): Likewise.
>> 	* prefix.c (update_path): Likewise.
>> 	* pretty-print.c (pp_base_destroy_prefix): Likewise.
>> 	* tree.c (build_string): Likewise.
>>
> 2007-08-26  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
> 
> 	* system.h (CONST_CAST): Avoid union for gcc-4.0.x.
> 
> diff -rup orig/egcc-SVN20070825/gcc/system.h egcc-SVN20070825/gcc/system.h
> --- orig/egcc-SVN20070825/gcc/system.h	2007-08-10 14:11:38.000000000 -0400
> +++ egcc-SVN20070825/gcc/system.h	2007-08-26 12:29:12.577795974 -0400
> @@ -774,7 +774,9 @@ extern void fancy_abort (const char *, i
>     execv, et al.  Another valid use would be in an allocation function
>     that creates const objects that need to be initialized.  Most other
>     cases should be viewed with extreme caution.  */
> -#ifdef __GNUC__
> +
> +#if defined(__GNUC__) && GCC_VERSION != 4000
> +/* GCC 4.0.x has a bug where it may ICE on this expression.  */
>  #define CONST_CAST(X) ((__extension__(union {__typeof(X)_q; void *_v;})(X))._v)
>  #else
>  #define CONST_CAST(X) ((void*)(X))
> 

Hi Kaveh,

This patch solves the issue, thanks!

Best Regards,

Brian Sidebotham.