[RFC] Fix PR 43564

[Jie Zhang]

On 03/29/2010 05:29 PM, Richard Guenther wrote:
> On Mon, Mar 29, 2010 at 9:42 AM, Jie Zhang<jie@codesourcery.com>  wrote:
>> At the end of decode_options, flag_var_tracking is still AUTODETECT_VALUE,
>> which is 2. It's set to 0 in process_options if we pass no options in
>> command line. Currently. we create optimization_default_node at the end of
>> decode_options. So flag_var_tracking is recorded as 2 in
>> optimization_default_node. After processing a function with optimize
>> attribute, options are reset to optimization_default_node, which set
>> flag_var_tracking to 2. Thus var_location and debug_insn will be generated
>> for the next functions, although we pass no debug options in command line.
>> Then if the function with var_location is inlined into a function with
>> optimize attribute. the tree operand of var_location will have no chance to
>> be expanded into RTL and eventually cause an ICE.
>>
>> To fix this bug, this patch just move initialization of
>> optimization_default_node from decode_options to process_options, where
>> flag_var_tracking and friends have been initialized properly.
>>
>> Regression testing has not been done yet.
>>
>> Is it OK if no regressions?
>
> Ok.
>
Thanks! Committed as bootstrapping and testing with 
--enable-languages=c,c++,objc,fortran on x86_64 has no regressions.


Jie