how to build without precompiled headers?

[coleenp]

I filed a Hotspot bug to change this and also fixed some C++ interpreter 
compilation errors with gcc 4.3.2 and 4.1.3 both on ubuntu.  Please note 
that the C++ interpreter isn't shipped on Sun's releases so may have 
bugs in 64 bit mode.  It seems to work on 32 bit linux.

http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6791168

Please review this code change:

http://webrev.invokedynamic.info/coleenp/6791168

thanks,
Coleen

Matthias Klose wrote:
> Thanks,
>
> please see
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38593
> and
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38725
>
> looks like current GCC versions accept invalid code:
>
> "That's really a duplicate of PR38725: The code contains many lines of the form
>
>   goto *dispatch_table[opcode];
>
> where dispatch_table[opcode] is of the type uintptr_t which is a typedef
> to unsigned int. Writing
>
>   goto *(void*)dispatch_table[opcode];
>
> instead makes the ICE disappear."
>
>
> Coleen Phillimore - Sun Microsystems schrieb:
>   
>> I tried this on my new 8.10 ubuntu system at home and commenting out
>> USE_PRECOMPILED_HEADER didn't use the precompiled header. The file
>> _precompiled.incl is still produced but it's empty. I believe you have
>> to do a make clean before your gcc.make change is used.
>>
>> The version of gcc that I used was very picky about inlined functions
>> not being defined in places where the other platforms were happy, so
>> there were multiple warnings with this message. I have a patch file that
>> resolves this, if you want it.
>> Also, on my 8.10 ubuntu, gcc version 4.1.forgot, I got an error building
>> fastdebug (server compiler) which I haven't resolved.
>>
>> /home/coleenp/hotspot/src/share/vm/libadt/port.hpp:40: error: 'void
>> bcopy(const void*, void*, size_t)' redeclared inline without
>> 'gnu_inline' attribute
>>
>> If you're trying to track down a compiler error building hotspot, try
>> getting a preprocessed output file to narrow it down.
>> cd linux*/<target>
>> make <file that had error>.i
>>
>> Hope this helps.
>> Coleen
>>
>> On 01/04/09 16:59, Matthias Klose wrote:
>>     
>>> Trying to track down an ICE (internal compiler error), I need to build
>>> hotspot
>>> without precompiled header files.  There is a macro
>>> USE_PRECOMPILED_HEADER
>>> defined in openjdk/hotspot/make/*/makefiles/gcc.make, but just
>>> removing the
>>> conditional around this definition still builds using precompiled
>>> header files.
>>> How can you build without precompiled header files (even if it's a hack)?
>>>
>>>   Matthias
>>>   
>>>       
>
>