RFR (M): 8036767 PPC64: Support for little endian execution model

Lindenmaier, Goetz goetz.lindenmaier at sap.com
Fri Mar 21 14:40:28 UTC 2014

 Hi David, 

yes, it's the hotspot only build. 

But that's no good If I have to set something that can be 
easily derived from information already available!

I at least would add another  $(shell uname -m) test
in the condition in the ppc64.make file.

ifeq (,$(filter $(OPENJDK_TARGET_CPU_ENDIAN),big little))
    ifeq($(shell uname -m), ppc64le)

Also, I don't see how defs.make deals with the outcome ppc64le of uname.
Sasha, is there missing something from your change?
If there needs to be a section 
# PPC64le
ifeq ($(ARCH), ppc64le)
  MAKE_ARGS        += LP64=1
  PLATFORM         = linux-ppc64
  VM_PLATFORM      = linux_ppc64
  HS_ARCH          = ppc
setting OPENJDK_TARGET_CPU_ENDIAN should be added there I think.

Best regards,

-----Original Message-----
From: David Holmes [mailto:david.holmes at oracle.com] 
Sent: Friday, March 21, 2014 12:08 PM
To: Lindenmaier, Goetz; 'Alexander Smundak'
Cc: 'build-dev'; 'HotSpot Open Source Developers'
Subject: Re: RFR (M): 8036767 PPC64: Support for little endian execution model

On 21/03/2014 7:06 PM, Lindenmaier, Goetz wrote:
> Hi Sasha,
> I tried to test your change (02), but it does not work.
> On linux ppc be;) I get
> make[4]: Leaving directory `/net/usr.work/d045726/oJ/builds/8036767-comp-ld9502-dbg/linux_ppc64_compiler2/debug'
> make[4]: Entering directory `/net/usr.work/d045726/oJ/builds/8036767-comp-ld9502-dbg/linux_ppc64_compiler2/debug'
> /sapmnt/home1/d045726/oJ/8036767-hs-comp/make/linux/makefiles/ppc64.make:30: *** OPENJDK_TARGET_CPU_ENDIAN has not been passed to this makefile.  Stop.
> which is just what you discussed with David.

Was that a full configure build or a hotspot-only build? For 
hotspot-only you would need to set this explicitly.


> On Aix I get
> "/sapmnt/home1/d045726/oJ/8036767-aix-hs-comp/src/cpu/ppc/vm/bytes_ppc.hpp", line 277.10: 1540-0836 (S) The #include file "bytes_linux_ppc.inline.hpp" is not found.
> I think we fixed this before, you  need to add
> #ifdef TARGET_OS_ARCH_linux_ppc
> around the include.
> Also, you need to fix os_linux.cpp: remove
> +  #if defined(PPC64)
> else other platforms will not build (linux x86_64):
> /sapmnt/home/d045726/oJ/8036767-hs-comp/src/os/linux/vm/os_linux.cpp:1972: error: ‘PPC64_ELFDATA2XSB’ was not declared in this scope
> Thanks for undoing the change in make/linux/Makefile!
> Best regards,
>    Goetz.
> -----Original Message-----
> From: hotspot-dev [mailto:hotspot-dev-bounces at openjdk.java.net] On Behalf Of Alexander Smundak
> Sent: Friday, March 21, 2014 7:15 AM
> To: David Holmes
> Cc: build-dev; HotSpot Open Source Developers
> Subject: Re: RFR (M): 8036767 PPC64: Support for little endian execution model
> Revised the patch to use OPENJDK_TARGET_CPU_ENDIAN instead. The new
> version is at:
> http://cr.openjdk.java.net/~martin/asmundak/8036767/hotspot/webrev.02
> On Thu, Mar 20, 2014 at 8:57 PM, David Holmes <david.holmes at oracle.com> wrote:
>> On 21/03/2014 1:42 PM, Alexander Smundak wrote:
>>> On Thu, Mar 20, 2014 at 7:39 PM, David Holmes <david.holmes at oracle.com>
>>> wrote:
>>>> The build changes look much cleaner to me - thanks.
>>> It's at the expense of platform directory being ppc64/ instead of the
>>> conventional ppc64le/, and having rather ugly check in the ppc64.make
>>> file.
>>>> Why are you not using OPENJDK_TARGET_CPU_ENDIAN directly? Ah! Because it
>>>> doesn't reach down into the <arch>.make files. ZERO_ENDIANNESS does but
>>>> seems inappropriate if this is not Zero specific. (I'm also not seeing
>>>> how
>>>> ZERO_ENDIANNESS reaches down that far either ??).
>>> configure script writes hotspot-spec.gmk file to the top-level build
>>> directory,
>>> and it contains
>> Yes but my query was how does ZERO_ENDIANNESS become visible in ppc64.make?
>> The answer to which is that the generated flags.make file has an explicit
>> include of hotspot-spec.gmk. In which case you don't need to use
>> ZERO_ENDIANNESS you can just use $(OPENJDK_TARGET_CPU_ENDIAN) directly.
>> (Which now begs the question as to why ZERO_ENDIANNESS even exists - perhaps
>> it predates the integration with the new build.)
>> David
>> -----
>>> The patch contains the fuse in ppc64.make, the build will fail unless
>>>>> jdk: http://cr.openjdk.java.net/~martin/asmundak/8036767/jdk/webrev.01
>>>> This change:
>>>> -      LDFLAGS_SUFFIX := $(ALSA_LIBS) -ljava -ljvm, \
>>>> +      LDFLAGS_SUFFIX := $(ALSA_LIBS) $(LIBDL) $(LIBM) -lpthread -ljava
>>>> -ljvm, \
>>>> seems unrelated to endianness. Why is it needed, and why is it being
>>>> applied
>>>> to all platforms?
>>> Sorry, this is not needed, it's the problem with the toolchain I am using.
>>> Please ignore this patch.

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