RFR: JDK-8214063: OpenJDK will not build on AIX while using the xlc 13.1 compiler
Adam Farley8
adam.farley at uk.ibm.com
Tue Nov 27 14:51:40 UTC 2018
Hi Ichiroh and Volker.
Short version:
I propose we exclude the -qvisibility option to conclude this bug, and
raise a new bug to cover adding -qvisibility into the build, complete with
the attendant supporting changes.
Long Version:
Based on this bug, I feel confident saying that anyone building on AIX is
using xlC 12.1 without the -qvisibility option.
I'm confident because, as discussed, the build doesn't complete on
non-12.1 with source as it is now.
After deliberation, it seems the right way to resolve this is to first
resolve the issue breaking the build, and *then* including a set of
changes required to enable OpenJDK to build successfully on AIX whiule
using a new compile option across the board (including on 12.1)
This is because the latter change, enabling us to build with -qvisibility,
will (as magnus notes) potentially cause problems elsewhere, and may
require a lot of testing.
Testing which may not be needed on 13.1, as we're updating the compiler
version (which *might* change stuff) as opposed to adding a new
command-line option (which *will* change stuff).
Also, I believe the .cpp change is preferable to the .hpp change because
it's easier to link the change to the error. Also, it's shorter.
My 2 cents. Volker, Ichiroh?
Best Regards
Adam Farley
IBM Runtimes
"Ichiroh Takiguchi" <takiguc at linux.vnet.ibm.com> wrote on 27/11/2018
12:36:41:
> From: "Ichiroh Takiguchi" <takiguc at linux.vnet.ibm.com>
> To: "Volker Simonis" <volker.simonis at gmail.com>
> Cc: Adam Farley8/UK/IBM at IBMGB, "Java Core Libs" <core-libs-
> dev at openjdk.java.net>
> Date: 27/11/2018 12:33
> Subject: Re: RFR: JDK-8214063: OpenJDK will not build on AIX while
> using the xlc 13.1 compiler
>
> Hello Volker.
>
> Sorry for your confusion.
> I want to keep visibility feature on AIX platform for future OpenJDK.
>
> If I can apply workaround for AIX platform...
>
> XLC++ 13.1 is confused destructor order for ~SimpleCriticalSectionLock()
> on src/java.base/share/native/libjimage/osSupport.hpp, if visibility
> feature is specified.
>
> Please see following testing.
> (I already applied a fix against
> src/java.base/unix/native/include/jni_md.h)
>
> $ sh NativeImageBuffer.o.cmdline
> "/home/jdktest/sandbox/jdk/build/aix-ppc64-server-release/support/
> headers/java.base/jdk_internal_jimage_NativeImageBuffer.h",
> line 15.27: 1540-0040 (S) The text
> "Java_jdk_internal_jimage_NativeImageBuffer_getNativeMap" is unexpected.
> "visibility" may be undeclared or ambiguous.
>
> If I applied following change
> ======
> $ hg di src/java.base/share/native/libjimage/osSupport.hpp
> diff -r 6cf555c2e9ff src/java.base/share/native/libjimage/osSupport.hpp
> --- a/src/java.base/share/native/libjimage/osSupport.hpp Sun Nov
> 25 21:41:12 2018 +0900
> +++ b/src/java.base/share/native/libjimage/osSupport.hpp Tue Nov
> 27 21:04:41 2018 +0900
> @@ -103,6 +103,7 @@
> SimpleCriticalSection *lock;
> public:
>
> +#ifndef _AIX
> SimpleCriticalSectionLock(SimpleCriticalSection *cslock) {
> this->lock = cslock;
> lock->enter();
> @@ -111,6 +112,16 @@
> ~SimpleCriticalSectionLock() {
> lock->exit();
> }
> +#else
> + ~SimpleCriticalSectionLock() {
> + lock->exit();
> + }
> +
> + SimpleCriticalSectionLock(SimpleCriticalSection *cslock) {
> + this->lock = cslock;
> + lock->enter();
> + }
> +#endif
> };
>
> #endif // LIBJIMAGE_OSSUPPORT_HPP
> ======
>
> No output was displayed by NativeImageBuffer.o.cmdline
> $ sh NativeImageBuffer.o.cmdline
> $
>
> Adam, if possible, could you double check my code ?
>
> Volker, I appreciate if you reconsider about this issue.
>
> Thanks,
> Ichiroh Takiguchi
>
>
> On 2018-11-27 03:26, Volker Simonis wrote:
> > On Mon, Nov 26, 2018 at 6:52 PM Ichiroh Takiguchi
> > <takiguc at linux.vnet.ibm.com> wrote:
> >>
> >> Hello Volker.
> >>
> >> I posted same kind of fix before:
> >> http://mail.openjdk.java.net/pipermail/ppc-aix-port-dev/2018-
> June/003551.html
> >>
> >> I could not find out brace handling issue on XLC++ 13.1.
> >>
> >> For workaround,
> >> ======
> >> ---
> >> old/src/java.base/share/native/libjimage/NativeImageBuffer.cpp
> >> 2018-06-07
> >> 21:06:09 +0000
> >> +++
> >> new/src/java.base/share/native/libjimage/NativeImageBuffer.cpp
> >> 2018-06-07
> >> 21:06:09 +0000
> >> @@ -39,7 +39,9 @@
> >> #include "imageFile.hpp"
> >> #include "inttypes.hpp"
> >> #include "jimage.hpp"
> >> +#if !defined(_AIX)
> >> #include "osSupport.hpp"
> >> +#endif
> >>
> >> #include "jdk_internal_jimage_NativeImageBuffer.h"
> >> ======
> >>
> >> I think osSupport.hpp is no need for all platform.
> >> (I tested it on Linux and AIX build)
> >>
> >> What do you think ?
> >>
> >
> > Sorry, but I don't understand your mail. Did you saw the same problems
> > like Adam when compiling "NativeImageBuffer.cpp"?
> >
> > - If yes, did you fix them by excluding the inclusion of
> > "osSupport.hpp" ? That would be strange, because it doesn't seem to
> > related to the problems reported until now at all.
> >
> > - If no, I'm totally confused...
> >
> >> Thanks,
> >> Ichiroh Takiguchi
> >> IBM Japan, Ltd.
> >>
> >> On 2018-11-27 02:06, Volker Simonis wrote:
> >> > On Mon, Nov 26, 2018 at 2:16 PM Adam Farley8
<adam.farley at uk.ibm.com>
> >> > wrote:
> >> >>
> >> >> Hi Volker,
> >> >>
> >> >> Apologies for the delay.
> >> >>
> >> >> I ran the contents of the file as requested (neat tip, thanks!)
and I
> >> >> discovered something:
> >> >>
> >> >> If jdk_internal_jimage_NativeImageBuffer.h contains this:
> >> >>
> >> >> -----
> >> >> extern "C" {
> >> >> __attribute__((visibility("default"))) jobject JNICALL
> >> >> Java_jdk_internal_jimage_NativeImageBuffer_getNativeMap
> >> >> (JNIEnv *, jclass, jstring);
> >> >> }
> >> >> -----
> >> >>
> >> >> It results in this error:
> >> >>
> >> >> -----
> >> >> blah blah "visibility" may be undeclared or ambiguous.
> >> >> -----
> >> >>
> >> >> But replacing that bit with this code:
> >> >>
> >> >> -----
> >> >> extern "C" __attribute__((visibility("default"))) jobject JNICALL
> >> >> Java_jdk_internal_jimage_NativeImageBuffer_getNativeMap
> >> >> (JNIEnv *, jclass, jstring);
> >> >> -----
> >> >>
> >> >> Results in no error.
> >> >>
> >> >> So it seems the difference between an "extern "C"" block and an
inline
> >> >> "extern"C"" is what's causing the issue.
> >> >>
> >> >
> >> > Thanks for finding this out. Now at least we know the root cause of
the
> >> > problem.
> >> >
> >> > Without having read through the C++ specification, I'd assume this
is
> >> > a problem of XLC 13.
> >> >
> >> > As long as XLC has problems to parse such kinds of constructs, I
thing
> >> > we should just remove "-qvisibility" from the AIX build as proposed
by
> >> > Magnus (and called "plan B" in you other mail) because changing the
> >> > javah generator for AIX would be a much larger task.
> >> >
> >> > Thank you and best regards,
> >> > Volker
> >> >
> >> >> I don't understand why, but there we have it.
> >> >>
> >> >> A shame the header file is generated. An ideal fix would either be
to:
> >> >>
> >> >> 1) Change xlC to make this work inside an extern "C" block.
> >> >> or
> >> >> 2) Change the way the header file is generated to add that extern
"C"
> >> >> bit onto the line itself.
> >> >>
> >> >> However both of those have the potential to break other stuff.
> >> >>
> >> >> I'm reaching out to the xlC developers now to figure out what's
going
> >> >> on, but in the
> >> >> meantime it seems to me like the proposed fix is still the right
way
> >> >> to go for a short-term
> >> >> resolution.
> >> >>
> >> >> What are your thoughts?
> >> >>
> >> >> Best Regards
> >> >>
> >> >> Adam Farley
> >> >> IBM Runtimes
> >> >>
> >> >>
> >> >> Volker Simonis <volker.simonis at gmail.com> wrote on 22/11/2018
> >> >> 14:25:04:
> >> >>
> >> >> > From: Volker Simonis <volker.simonis at gmail.com>
> >> >> > To: adam.farley at uk.ibm.com
> >> >> > Cc: Java Core Libs <core-libs-dev at openjdk.java.net>, "Stuefe,
> >> >> > Thomas" <thomas.stuefe at gmail.com>
> >> >> > Date: 22/11/2018 14:25
> >> >> > Subject: Re: RFR: JDK-8214063: OpenJDK will not build on AIX
while
> >> >> > using the xlc 13.1 compiler
> >> >> >
> >> >> > On Thu, Nov 22, 2018 at 3:00 PM Adam Farley8
> <adam.farley at uk.ibm.com> wrote:
> >> >> > >
> >> >> > > Hi Volker,
> >> >> > >
> >> >> > > 1) Here is the "reasonable" code in the generated
> >> >> > jdk_internal_jimage_NativeImageBuffer.h
> >> >> > >
> >> >> > > ------------------------------------------------------
> >> >> > > /* DO NOT EDIT THIS FILE - it is machine generated */
> >> >> > > #include <jni.h>
> >> >> > > /* Header for class jdk_internal_jimage_NativeImageBuffer */
> >> >> > >
> >> >> > > #ifndef _Included_jdk_internal_jimage_NativeImageBuffer
> >> >> > > #define _Included_jdk_internal_jimage_NativeImageBuffer
> >> >> > > #ifdef __cplusplus
> >> >> > > extern "C" {
> >> >> > > #endif
> >> >> > > /*
> >> >> > > * Class: jdk_internal_jimage_NativeImageBuffer
> >> >> > > * Method: getNativeMap
> >> >> > > * Signature: (Ljava/lang/String;)Ljava/nio/ByteBuffer;
> >> >> > > */
> >> >> > > JNIEXPORT jobject JNICALL
> >> >> > Java_jdk_internal_jimage_NativeImageBuffer_getNativeMap
> >> >> > > (JNIEnv *, jclass, jstring);
> >> >> > >
> >> >> > > #ifdef __cplusplus
> >> >> > > }
> >> >> > > #endif
> >> >> > > #endif
> >> >> > > ------------------------------------------------------
> >> >> > >
> >> >> > >
> >> >> > > 2) I have not yet reported this as a bug to the xlc
developers. I
> >> >> > will contact
> >> >> > > them now.
> >> >> > >
> >> >> > > 3) I did some experimenting, and it seems that the
> >> >> > NativeImageBuffer.cpp change
> >> >> > > is the only thing standing between us and a successful
compilation
> >> >> > on aix using
> >> >> > > xlc 13.1 (assuming you're using source that compiles on
> aix with xlc 12.1).
> >> >> > >
> >> >> > > With that change (plus the jni_md change), the
compilationcompletes.
> >> >> > >
> >> >> > > Without that change (after you've added the jni_md change
> though),the build
> >> >> > > will fail with this error message:
> >> >> > >
> >> >> > > ------------------------------------------------------
> >> >> > > 12:19:58 "/workspace/build/aix-ppc64-normal-server-release/
> >> >> >
support/headers/java.base/jdk_internal_jimage_NativeImageBuffer.h",
> >> >> > line 15.27: 1540-0040 (S) The text
> >> >> > "Java_jdk_internal_jimage_NativeImageBuffer_getNativeMap" is
> >> >> > unexpected. "visibility" may be undeclared or ambiguous.
> >> >> > > 12:19:59 CoreLibraries.gmk:192: recipe for target '/workspace/
> >> >> > build/aix-ppc64-normal-server-release/support/native/java.base/
> >> >> > libjimage/NativeImageBuffer.o' failed
> >> >> > > ------------------------------------------------------
> >> >> > >
> >> >> >
> >> >> > Can you please do the following:
> >> >> > - take the command line from
> >> >> > /workspace/build/aix-ppc64-normal-server-release/support/native/
> >> >> > java.base/libjimage/NativeImageBuffer.o.cmdline
> >> >> > - replace '-c' with '-E' to get the preprocessor output
> >> >> > - have a look at the offending line (e.g. have JNIEXPORT /
JNICALL
> >> >> > been correctly expanded ?)
> >> >> >
> >> >> > Unfortunately I don't have a version of XLC 13 to test this.
> >> >> >
> >> >> > > Best Regards
> >> >> > >
> >> >> > > Adam Farley
> >> >> > > IBM Runtimes
> >> >> > >
> >> >> > > P.S. Tried making a small, stand-alone example and it failed
to
> >> >> > reproduce the problem.
> >> >> > > Will keep trying, and I'll supply a further update in the
event of
> >> >> > a) results,
> >> >> > > or b) a response from the xlc guys.
> >> >> > >
> >> >> > >
> >> >> > > Volker Simonis <volker.simonis at gmail.com> wrote on 21/11/
> 2018 14:07:07:
> >> >> > >
> >> >> > > > From: Volker Simonis <volker.simonis at gmail.com>
> >> >> > > > To: adam.farley at uk.ibm.com
> >> >> > > > Cc: Java Core Libs <core-libs-dev at openjdk.java.net>,
"Stuefe,
> >> >> > > > Thomas" <thomas.stuefe at gmail.com>
> >> >> > > > Date: 21/11/2018 14:07
> >> >> > > > Subject: Re: RFR: JDK-8214063: OpenJDK will not build onAIX
while
> >> >> > > > using the xlc 13.1 compiler
> >> >> > > >
> >> >> > > > On Wed, Nov 21, 2018 at 1:46 PM Adam Farley8
> >> >> > <adam.farley at uk.ibm.com> wrote:
> >> >> > > > >
> >> >> > > > > Hi Volker,
> >> >> > > > >
> >> >> > > > > The NativeImageBuffer.cpp changes are best explained
> by the full text of
> >> >> > > > > the referenced GitHub Pull Request, copied here for
simplicity:
> >> >> > > > >
> >> >> > > > > -----------------------------------------
> >> >> > > > > Define JNIEXPORT and JNIIMPORT for xlc version 13.1 or
newer.
> >> >> > Without this,
> >> >> > > > > almost no symbols are exported from shared libraries
> due to use of
> >> >> > > > > -qvisibility=hidden as specified in make/lib/
> LibCommon.gmk. The symptoms
> >> >> > > > > are reported in eclipse/openj9#2468.
> >> >> > > > >
> >> >> > > > > Unfortunately, this encounters a bug in xlc: it fails
> to parsewhat seems
> >> >> > > > > to be reasonable code.
> >> >> > > >
> >> >> > > > Sorry, but I don't see how this answers my question.
> >> >> > > >
> >> >> > > > 1. Which "reasonable code" does xlc fails to parse. A
stand-alone
> >> >> > > > example would be nice.
> >> >> > > >
> >> >> > > > 2. Have you reported this as bug to the xlc developers?
> What didthey say?
> >> >> > > >
> >> >> > > > 3. "jdk_internal_jimage_NativeImageBuffer.h" doesn't seem to
be
> >> >> > > > special. It's a plain, generated JNI header file as
generated by
> >> >> > > > 'javah' or 'javac -h'. If XLC 13 has problems parsing
> it, there should
> >> >> > > > be much more places which need fixing. So what's special
about
> >> >> > > > "jdk_internal_jimage_NativeImageBuffer.h".
> >> >> > > >
> >> >> > > > In the referenced pull request
> >> >> > > > (https://urldefense.proofpoint.com/v2/url?
> >> >> > > >
> >> >> >
>
u=https-3A__github.com_eclipse_openj9_issues_2468&d=DwIFaQ&c=jf_iaSHvJObTbx-
> >> >> > > > siA1ZOg&r=P5m8KWUXJf-
> >> >> > > >
> >> >> >
>
CeVJc0hDGD9AQ2LkcXDC0PMV9ntVw5Ho&m=sgfFd6mB1EYM4nOM89rgFFzUyX7B21XbckIY7L0kUNU&s=TJ-4nr8ikZKImwDygirRTxLybsnQWBN71nEZCwZ59NQ&e=
> >> >> > > > ) I can only see linker
> >> >> > > > errors (and no compiler errors). The linker errors are for
both
> >> >> > > > libjsig and libjava. They are related to the symbol
> ".sigaction" in
> >> >> > > > jsig.o and I don't see how this should be related to
> >> >> > > > NativeImageBuffer.cpp or
> "jdk_internal_jimage_NativeImageBuffer.h".
> >> >> > > > NativeImageBuffer.cpp is only used to create libjimage
> and not related
> >> >> > > > in any way to libjsig or libjava.
> >> >> > > >
> >> >> > > > It seems wired to do the change to NativeImageBuffer.cpp
> which you've
> >> >> > > > proposed without understanding the real cause of the
problem.
> >> >> > > >
> >> >> > > > Regards,
> >> >> > > > Volker
> >> >> > > >
> >> >> > > > > A workaround is required in just one place:
> >> >> > > > >
src/java.base/share/native/libjimage/NativeImageBuffer.cpp.
> >> >> > > > > -----------------------------------------
> >> >> > > > >
> >> >> > > > > Best Regards
> >> >> > > > >
> >> >> > > > > Adam Farley
> >> >> > > > > IBM Runtimes
> >> >> > > > >
> >> >> > > > >
> >> >> > > > > Volker Simonis <volker.simonis at gmail.com> wrote on 20/
> 11/2018 17:50:41:
> >> >> > > > >
> >> >> > > > > > From: Volker Simonis <volker.simonis at gmail.com>
> >> >> > > > > > To: "Stuefe, Thomas" <thomas.stuefe at gmail.com>
> >> >> > > > > > Cc: adam.farley at uk.ibm.com, Java Core Libs <core-libs-
> >> >> > > > dev at openjdk.java.net>
> >> >> > > > > > Date: 20/11/2018 17:59
> >> >> > > > > > Subject: Re: RFR: JDK-8214063: OpenJDK will not
> build on AIX while
> >> >> > > > > > using the xlc 13.1 compiler
> >> >> > > > > >
> >> >> > > > > > On Tue, Nov 20, 2018 at 6:15 PM Thomas Stüfe
> >> >> > > > <thomas.stuefe at gmail.com> wrote:
> >> >> > > > > > >
> >> >> > > > > > > On Tue, Nov 20, 2018 at 6:12 PM Adam Farley8
> >> >> > > > <adam.farley at uk.ibm.com> wrote:
> >> >> > > > > > > >
> >> >> > > > > > > > Heya Tom,
> >> >> > > > > > > >
> >> >> > > > > > > > "In JDK11 and JDK12, source files are compiled with
-
> >> >> > > > qvisibility=hidden
> >> >> > > > > > > > when using xlc version other than 12.1. That doesn't
> >> >> > seem toplay well
> >> >> > > > > > > > with link option -bexpall. "
> >> >> > > > > > > >
> >> >> > > > > > > > Found that buried in one of the associated Git
issues.
> >> >> > It appears that
> >> >> > > > > > > > it's OpenJDK's use of that option that's causing the
> >> >> > problem, though
> >> >> > > > > > > > I couldn't speculate as to why it was added in
> the first place.
> >> >> > > > > > > >
> >> >> > > > > > > > I see this has also been noted in https://
> >> >> > > > > > urldefense.proofpoint.com/v2/url?
> >> >> > > > > >
> >> >> > > >
> >> >> >
>
u=https-3A__bugs.openjdk.java.net_browse_JDK-2D8204541&d=DwIFaQ&c=jf_iaSHvJObTbx-
> >> >> > > > > > siA1ZOg&r=P5m8KWUXJf-
> >> >> > > > > >
> >> >> > > >
> >> >> >
>
CeVJc0hDGD9AQ2LkcXDC0PMV9ntVw5Ho&m=SD6UdjysISJRBlWUm8pEzF5lRZ5opfbrKzEh_jrOras&s=5qDEdIfg8qZ-
> >> >> > > > > > vCglsZ9qNDTEPMnCkj-mVPVah6eEDLE&e=
> >> >> > > > > > > >
> >> >> > > > > > > > Does that answer your question?
> >> >> > > > > > > >
> >> >> > > > > > >
> >> >> > > > > > > Yes, Thank you. Odd. Will have to do archeology onthat
one.
> >> >> > > > > > >
> >> >> > > > > >
> >> >> > > > > > No I begin to understand the problem as well :)
> >> >> > > > > >
> >> >> > > > > > It was actually change "8202322: AIX: symbol
> visibility flags not
> >> >> > > > > > support on xlc 12.1" [1] which introduced "-
> qvisibility=hidden" for
> >> >> > > > > > XLC version not equal to 12.1. That's kind of a weak
> check and I
> >> >> > > > > > suppose nobody has ever tested this change with an
> XLC version other
> >> >> > > > > > than 12.1 (until you came along :). Maybe that check
> should be a more
> >> >> > > > > > precisly check for >= 13.1 (but I know such version
> checks are hard to
> >> >> > > > > > do in Makefile syntax)?
> >> >> > > > > >
> >> >> > > > > > The thing I don't understand about your patch (the
changes in
> >> >> > > > > > "jni_md.h" look good although I haven't tested them)
> is why you need
> >> >> > > > > > the extra changes in NativeImageBuffer.cpp?
> >> >> > > > > > "jdk_internal_jimage_NativeImageBuffer.h" is a
> plain, generated JNI
> >> >> > > > > > header file. If XLC 13 has problems to parse it,
> there should be much
> >> >> > > > > > more places which need fixing. I think that part of
> your change needs
> >> >> > > > > > a closer evaluation.
> >> >> > > > > >
> >> >> > > > > > Thank you and best regards,
> >> >> > > > > > Volker
> >> >> > > > > >
> >> >> > > > > > [1] https://urldefense.proofpoint.com/v2/url?
> >> >> > > > > >
> >> >> > > >
> >> >> >
>
u=https-3A__bugs.openjdk.java.net_browse_JDK-2D8202322&d=DwIFaQ&c=jf_iaSHvJObTbx-
> >> >> > > > > > siA1ZOg&r=P5m8KWUXJf-
> >> >> > > > > >
> >> >> > > >
> >> >> >
>
CeVJc0hDGD9AQ2LkcXDC0PMV9ntVw5Ho&m=SD6UdjysISJRBlWUm8pEzF5lRZ5opfbrKzEh_jrOras&s=JAEK6rePGMPinZzOquHBzj5oc7vA3kaFt9x0WIIUzvk&e=
> >> >> > > > > >
> >> >> > > > > > > ..Thomas
> >> >> > > > > > >
> >> >> > > > > > > > Best Regards
> >> >> > > > > > > >
> >> >> > > > > > > > Adam Farley
> >> >> > > > > > > > IBM Runtimes
> >> >> > > > > > > >
> >> >> > > > > > > >
> >> >> > > > > > > > "Thomas Stüfe" <thomas.stuefe at gmail.com> wrote on
20/11/
> >> >> > 201816:44:07:
> >> >> > > > > > > >
> >> >> > > > > > > > > From: "Thomas Stüfe" <thomas.stuefe at gmail.com>
> >> >> > > > > > > > > To: Adam Farley8 <adam.farley at uk.ibm.com>
> >> >> > > > > > > > > Cc: Java Core Libs
<core-libs-dev at openjdk.java.net>
> >> >> > > > > > > > > Date: 20/11/2018 16:48
> >> >> > > > > > > > > Subject: Re: RFR: JDK-8214063: OpenJDK will not
build
> >> >> > on AIX while
> >> >> > > > > > > > > using the xlc 13.1 compiler
> >> >> > > > > > > > >
> >> >> > > > > > > > > Hi Adam,
> >> >> > > > > > > > >
> >> >> > > > > > > > > On Tue, Nov 20, 2018 at 5:12 PM Adam Farley8
> >> >> > > > > > <adam.farley at uk.ibm.com> wrote:
> >> >> > > > > > > > > >
> >> >> > > > > > > > > > Hi Tom,
> >> >> > > > > > > > > >
> >> >> > > > > > > > > > Sounds reasonable. I've added a webex to the
> bug, and here's a
> >> >> > > > > > > > > link to the bug.
> >> >> > > > > > > > > >
> >> >> > > > > > > > > > https://urldefense.proofpoint.com/v2/url?
> >> >> > > > > > > > >
> >> >> > > > > >
> >> >> > > >
> >> >> >
>
u=https-3A__bugs.openjdk.java.net_browse_JDK-2D8214063&d=DwIFaQ&c=jf_iaSHvJObTbx-
> >> >> > > > > > > > > siA1ZOg&r=P5m8KWUXJf-
> >> >> > > > > > > > >
> >> >> > > > > >
> >> >> > > >
> >> >> >
>
CeVJc0hDGD9AQ2LkcXDC0PMV9ntVw5Ho&m=z8YYwBXEfN7UtX1suPjpp9CZSHf8v0GrIMK3XGIC9VY&s=81TP9mIjhYD2Hmt8g7p2EHWRZXgiep21hxKLYRU7zIQ&e=
> >> >> > > > > > > > > >
> >> >> > > > > > > > > > This patch is required because otherwise,
> when building on AIX
> >> >> > > > > > > > > using xlc 3.1,
> >> >> > > > > > > > > > the build fails with this error:
> >> >> > > > > > > > > >
> >> >> > > > > > > > > > "Visibility is not allowed on a reference to an
> >> >> > imported symbol."
> >> >> > > > > > > > > >
> >> >> > > > > > > > > > We believe this is caused by JNIEXPORT and
> JNIIMPORTnot being
> >> >> > > > > > > > > defined. Without
> >> >> > > > > > > > > > this, almost no symbols are exported from
> shared libraries
> >> >> > > > > > due to use of
> >> >> > > > > > > > > > -qvisibility=hidden as specified in make/
> lib/LibCommon.gmk.
> >> >> > > > > > > > >
> >> >> > > > > > > > > Yes but what I try to understand is why does this
> >> >> > happen now with
> >> >> > > > > > > > > xlc13? Did xlc change the rules for -qvisibility
from
> >> >> > v12 to v13 ?
> >> >> > > > > > > > > That would be quite a break in backward
compatibility.
> >> >> > > > > > > > >
> >> >> > > > > > > > > >
> >> >> > > > > > > > > > For convenience, here's a summary of the diffs:
> >> >> > > > > > > > > >
> >> >> > > > > > > > > > --------------------------------------
> >> >> > > > > > > > > > File 1 of 2)
src/java.base/share/native/libjimage/
> >> >> > > > > > NativeImageBuffer.cpp
> >> >> > > > > > > > > >
> >> >> > > > > > > > > > #include "osSupport.hpp"
> >> >> > > > > > > > > >
> >> >> > > > > > > > > > +#if defined(__xlC__) && (__xlC__ >= 0x0d01)
> >> >> > > > > > > > > > +/*
> >> >> > > > > > > > > > + * Version 13.1.3 of xlc seems to have
> trouble parsing the
> >> >> > > > > > `__attribute__`
> >> >> > > > > > > > > > + * annotation in the generated header file
> we're about to
> >> >> > > > > > > > > include. Repeating
> >> >> > > > > > > > > > + * the forward declaration (without the
> braces) here avoids
> >> >> > > > > > the diagnostic:
> >> >> > > > > > > > > > + * 1540-0040 (S) The text "void" is
unexpected.
> >> >> > "visibility"
> >> >> > > > > > > > > may be undeclared or ambiguous.
> >> >> > > > > > > > > > + */
> >> >> > > > > > > > > > +extern "C" JNIEXPORT jobject JNICALL
> >> >> > > > > > > > >
> >> >> > Java_jdk_internal_jimage_NativeImageBuffer_getNativeMap(JNIEnv
*,
> >> >> > > > > > > > > jclass, jstring);
> >> >> > > > > > > > > > +#endif
> >> >> > > > > > > > > > +
> >> >> > > > > > > > > > #include
"jdk_internal_jimage_NativeImageBuffer.h"
> >> >> > > > > > > > > > --------------------------------------
> >> >> > > > > > > > > > File 2 of 2) src/java.base/unix/native/
> include/jni_md.h
> >> >> > > > > > > > > >
> >> >> > > > > > > > > > #define JNIIMPORT __attribute__((visibility
> >> >> > ("default")))
> >> >> > > > > > > > > > #endif
> >> >> > > > > > > > > > +#elif defined(__xlC__) && (__xlC__ >= 0x0d01)
/*
> >> >> > xlc version 13.1
> >> >> > > > > > > > > or better required */
> >> >> > > > > > > > > > + #define JNIEXPORT __attribute__((visibility
> >> >> > ("default")))
> >> >> > > > > > > > > > + #define JNIIMPORT __attribute__((visibility
> >> >> > ("default")))
> >> >> > > > > > > > > > #else
> >> >> > > > > > > > > > #define JNIEXPORT
> >> >> > > > > > > > > > --------------------------------------
> >> >> > > > > > > > > >
> >> >> > > > > > > > >
> >> >> > > > > > > > > Thank you.
> >> >> > > > > > > > >
> >> >> > > > > > > > > Cheers, Thomas
> >> >> > > > > > > > >
> >> >> > > > > > > > > > Best Regards
> >> >> > > > > > > > > >
> >> >> > > > > > > > > > Adam Farley
> >> >> > > > > > > > > > IBM Runtimes
> >> >> > > > > > > > > >
> >> >> > > > > > > > > >
> >> >> > > > > > > > > > "Thomas Stüfe" <thomas.stuefe at gmail.com>
> wrote on 19/11/
> >> >> > > > 201818:11:34:
> >> >> > > > > > > > > >
> >> >> > > > > > > > > > > From: "Thomas Stüfe" <thomas.stuefe at gmail.com>
> >> >> > > > > > > > > > > To: Adam Farley8 <adam.farley at uk.ibm.com>
> >> >> > > > > > > > > > > Cc: Java Core Libs
<core-libs-dev at openjdk.java.net>
> >> >> > > > > > > > > > > Date: 19/11/2018 18:12
> >> >> > > > > > > > > > > Subject: Re: RFR: JDK-8214063: OpenJDK
> will not build
> >> >> > > > on AIX while
> >> >> > > > > > > > > > > using the xlc 13.1 compiler
> >> >> > > > > > > > > > >
> >> >> > > > > > > > > > > Hi Adam,
> >> >> > > > > > > > > > >
> >> >> > > > > > > > > > > could you please include link to the JBS
> issue and either
> >> >> > > > > > link to the
> >> >> > > > > > > > > > > patch/webrev or link to the webrev, or at the
very
> >> >> > > > least the patch
> >> >> > > > > > > > > > > verbatim?
> >> >> > > > > > > > > > >
> >> >> > > > > > > > > > > As for the issue itself: could you please
> elaborate why this
> >> >> > > > > > > > > fails with xlc13?
> >> >> > > > > > > > > > >
> >> >> > > > > > > > > > > Also, a real patch would be helpful instead
here of
> >> >> > > > yet another link
> >> >> > > > > > > > > > > to some J9 issue. We are really strapped
> for manpower and
> >> >> > > > > > the AIX port
> >> >> > > > > > > > > > > eats up enough time as it is.
> >> >> > > > > > > > > > >
> >> >> > > > > > > > > > > Thanks, Thomas
> >> >> > > > > > > > > > >
> >> >> > > > > > > > > > > On Mon, Nov 19, 2018 at 6:28 PM Adam Farley8
> >> >> > > > > > > > > <adam.farley at uk.ibm.com> wrote:
> >> >> > > > > > > > > > > >
> >> >> > > > > > > > > > > > Hi All
> >> >> > > > > > > > > > > >
> >> >> > > > > > > > > > > > Both the problem and the solution
appearstraight-
> >> >> > > > forward enough.
> >> >> > > > > > > > > > > >
> >> >> > > > > > > > > > > > Details included in the bug description.
> >> >> > > > > > > > > > > >
> >> >> > > > > > > > > > > > Thoughts and opinions welcome.
> >> >> > > > > > > > > > > >
> >> >> > > > > > > > > > > > Best Regards
> >> >> > > > > > > > > > > >
> >> >> > > > > > > > > > > > Adam Farley
> >> >> > > > > > > > > > > > IBM Runtimes
> >> >> > > > > > > > > > > >
> >> >> > > > > > > > > > > > Unless stated otherwise above:
> >> >> > > > > > > > > > > > IBM United Kingdom Limited - Registered
> in England and
> >> >> > > > > > Wales with number
> >> >> > > > > > > > > > > > 741598.
> >> >> > > > > > > > > > > > Registered office: PO Box 41, North
> Harbour, Portsmouth,
> >> >> > > > > > > > > Hampshire PO6 3AU
> >> >> > > > > > > > > > >
> >> >> > > > > > > > > >
> >> >> > > > > > > > > > Unless stated otherwise above:
> >> >> > > > > > > > > > IBM United Kingdom Limited - Registered in
England
> >> >> > and Wales with
> >> >> > > > > > > > > number 741598.
> >> >> > > > > > > > > > Registered office: PO Box 41, North Harbour,
> Portsmouth,
> >> >> > > > > > Hampshire PO6 3AU
> >> >> > > > > > > > >
> >> >> > > > > > > >
> >> >> > > > > > > > Unless stated otherwise above:
> >> >> > > > > > > > IBM United Kingdom Limited - Registered in
> England and Wales
> >> >> > > > > > with number 741598.
> >> >> > > > > > > > Registered office: PO Box 41, North Harbour,
Portsmouth,
> >> >> > > > Hampshire PO6 3AU
> >> >> > > > > >
> >> >> > > > >
> >> >> > > > > Unless stated otherwise above:
> >> >> > > > > IBM United Kingdom Limited - Registered in England
andWales with
> >> >> > > > number 741598.
> >> >> > > > > Registered office: PO Box 41, North Harbour, Portsmouth,
> >> >> > Hampshire PO6 3AU
> >> >> > > >
> >> >> > >
> >> >> > > Unless stated otherwise above:
> >> >> > > IBM United Kingdom Limited - Registered in England and Wales
with
> >> >> > number 741598.
> >> >> > > Registered office: PO Box 41, North Harbour, Portsmouth,
> Hampshire PO6 3AU
> >> >> >
> >> >>
> >> >> Unless stated otherwise above:
> >> >> IBM United Kingdom Limited - Registered in England and Wales with
> >> >> number 741598.
> >> >> Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire
PO6
> >> >> 3AU
> >>
Unless stated otherwise above:
IBM United Kingdom Limited - Registered in England and Wales with number
741598.
Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU
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