how to build without precompiled headers?

[Matthias Klose]

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
>>