Hi Nikolay,

>he unresolved symbol are not matched in in c++ library but matched in
>libfbembedded.so. I bet my right arm on this
>Simply becouse LD_PRELOAD=libfbembedded.so ldd -r libjaybird.so doesn't

yeld

>any unresolved symbols. I suppose renaming libfbembedded.so to
>libfbclient.so will be enough, but somewhy skeptical to this.

I assume this is because libfbembedded.so links with the c++ runtime. Try
adding

<syslibset libs="stdc++"/>

at line 229 of build_native.xml

<target name="prepare_gcc" if="buildon-unix">

<compiler id="jaybird.compiler" name="gcc" if="buildon-unix">

<defineset>
<define name="JAVA_GDS_EXPORTS"/>
</defineset>
</compiler>


<linker id="jaybird.linker" name="gcc" if="buildon-unix">
<linkerarg value="-ldl"/>
<linkerarg value="-lc"/> <--- HERE
</linker>

</target>

These are almost definatly c++ runtime methods.

Thanks
Ryan



-----Original Message-----
From: Nikolay Ivanchev [mailto:nivanchev@...]
Sent: 04 November 2003 12:38
To: Firebird-Java@yahoogroups.com
Subject: Re: [Firebird-Java] Firebird embedded on Linux - success


Thanks Ryan for the replay.

The only change I made is to workaround _alloca call in entryoints.cpp

The unresolved symbol are not matched in in c++ library but matched in
libfbembedded.so. I bet my right arm on this
Simply becouse LD_PRELOAD=libfbembedded.so ldd -r libjaybird.so doesn't yeld
any unresolved symbols. I suppose renaming libfbembedded.so to
libfbclient.so will be enough, but somewhy skeptical to this.
As I stated, I am not C developer so I cannot help much in linking problem.
My converted apps work with LD_PRELOAD just fine
Tonight I will correct _alloca to alloca and will run my tests on BLOB and I
will report this tommorow.

BTW which ant task is to run against embedded?
Regards,
Niki

> Hi Nikolay,
>
> >1. Compiling entrypoints.cpp -
> >method JNIEXPORT jbyteArray JNICALL
> Java_org_firebirdsql_ngds_GDS_1Impl_native_1isc_1blob_1info
> >There is a bug in line 937 -> char* resultBuffer =
> (char*)_alloca(jBufferLength); <-
> >There is no such method. Since you can blame me in everything, except

being

> C (C++)developer I >>
> >simply changed this line to make the char* to some string (with my ego it
> was my name).
> >I suppose _alloca is in some .h file but ....
>
> This is a mistake I made while implementing this method. It should read
> 'alloca' rather then '_alloca'. alloca is then defined in platform.h
> appropriatly. I will correct this in CVS today - but if you make that
> replacement it should work better.
>
> >root@localhost firebird2]# Exception in thread "main"
> java.lang.UnsatisfiedLinkError: >/opt//jdk1.4/jre/lib/i386/libjaybird.so:
> /opt/jdk1.4/jre/lib/i386/libjaybird.so: undefined symbol:
> >>_ZTVN10__cxxabiv117__class_type_infoE
> > at java.lang.ClassLoader$NativeLibrary.load(Native Method)
> > at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1473)
> > at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1389)
> > at java.lang.Runtime.loadLibrary0(Runtime.java:788)
> > at java.lang.System.loadLibrary(System.java:832)
> > at org.firebirdsql.ngds.GDS_Impl.<init>(GDS_Impl.java:53)
> >
> >
> >When i ldd-ed the libjaybird.so I saw this
> >[root@localhost libr]# ldd -r /usr/lib/libjaybird.so
> > libdl.so.2 => /lib/libdl.so.2 (0x40037000)
> > libc.so.6 => /lib/i686/libc.so.6 (0x42000000)
> > /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x80000000)
> >undefined symbol: _ZTVN10__cxxabiv117__class_type_infoE
> (/usr/lib/libjaybird.so)
> >undefined symbol: __gxx_personality_v0 (/usr/lib/libjaybird.so)
> >undefined symbol: _ZTISt9bad_alloc (/usr/lib/libjaybird.so)
> >undefined symbol: _Znaj (/usr/lib/libjaybird.so)
> >undefined symbol: _ZdlPv (/usr/lib/libjaybird.so)
> >undefined symbol: __cxa_end_catch (/usr/lib/libjaybird.so)
> >undefined symbol: _Unwind_Resume (/usr/lib/libjaybird.so)
> >undefined symbol: __cxa_throw (/usr/lib/libjaybird.so)
> >undefined symbol: _ZdaPv (/usr/lib/libjaybird.so)
> >undefined symbol: __cxa_begin_catch (/usr/lib/libjaybird.so)
> >undefined symbol: __cxa_allocate_exception (/usr/lib/libjaybird.so)
> >
> >I searched for those symbols and I found them in libfbembedded.so
> >
> >At this point the final solution was simple (coping libfbembedded.so to
> libfbclient.so)
> >LD_PRELOAD libfbcliend.so java -cp <my_classes> <main_method>
> >
> >Everything wokrs just fine on my apps and tests excpet BLOBLS ofcourse :)
> >Actually i modified java.library.path (well this time using path.seprator
> instead of ";")
> >The problem is that I played with LD_LIBRARY_PATH and java.library.path

but

> it was 5am in the
> >morning, so I am not 100% sure which solutuon works, however I am 95%

sure

> that java.library.path is >the right one.
>
> These symbols look like they are probarbly part of the c++ runtime

library.

> I dont know what the c++ runtime library is called for linux but ensuring
> libjaybird.so is linked with the correct c++ runtime I would guess should
> correct this problem.
>
> >Since libjaybird is wrapper to libfbembedded why not link to it?
>
> libjaybird links with the firebird client library using what in microsoft
> terminology is called explicit dynamic linking. This is where it loads the
> dll explicitly by name and then resolves entrypoints manually(see
> FBBinings). This allows it more control over which dll is loaded and could
> allow it too behave differntly depending on which entrypoints it finds on
> the dll allowing it to in theory fail gracefully for missing features in
> older versions.
>
> The alternitive of linking staticly with the firebird client libraries
> static import library would be whats refered too as implicit dynamic
> linking - the static import library takes care of loading the dll and
> resolving entrypoints for us - making it potentially more straightforward

to

> make use of the functionality within a dll - but taking away the

advantages

> described above. For example if we where too do this to make use of both
> embedded server and type 2 mode on windows we would either need two
> different jaybird.dll's(linked against different static import

libraries) -

> or force the user to rename fbembed.dll to use it.
>
> >Yesterday I had a nasty problem with fbembedded on Windows. MSVC60

Depends

> tool shows that
> >fbembedded (fbclient) depends only on msvcrt.dll but when I deployed the
> app on tests machines which >does not have any additional software

installed

> I saw that msvcp60.dll is required also (which was a >difficult to trace
> problem, my first instalation was on win9x machine, which threw an
> exception, >
> >win2k machine pop-uped a screen which informed me about missed dll but 2
> hours later... :(
>
> Their has been some discussion regarding this in fb-support and
> fb-development. There are some issues. Perhaps search the archives of

these

> forums for more details.
>
> >Can some one guide me a little with JUnit tetst for firebird so I can
> rework them to run against
> >embedded firebird.
>
> What problems do you get with running the target in the ant build script

for

> running the tests against the embedded server ?
>
> >What else can I do to help?
>
> If you could detail the changes you have made to get this running under
> linux we make appropriate changes in CVS version so it can checkout too

and

> build/run on linux as easily as it does on windows/solaris(or did until

the

> _alloca mistake). (Yipee linux support in jaybird native !)
>
> I hope this is of help.
>
> Thanks
> Ryan
>
>
>
> -----Original Message-----
> From: Nikolay Ivanchev [mailto:nivanchev@...]
> Sent: 04 November 2003 08:46
> To: JayBird
> Subject: [Firebird-Java] Firebird embedded on Linux - success
>
>
> Early this morning I managed to run it finaly.
> Here are the problems which I encounter
> 1. Compiling entrypoints.cpp -
> method JNIEXPORT jbyteArray JNICALL
> Java_org_firebirdsql_ngds_GDS_1Impl_native_1isc_1blob_1info
> There is a bug in line 937 -> char* resultBuffer =
> (char*)_alloca(jBufferLength); <-
> There is no such method. Since you can blame me in everything, except

being

> C (C++)developer I simply changed this line to make the char* to some

string

> (with my ego it was my name).
> I suppose _alloca is in some .h file but ....
>
> 2. After compiling libjaybird.so is not linked to libfbembedded so when I
> tried to run sample app it returned to me:
>
> root@localhost firebird2]# Exception in thread "main"
> java.lang.UnsatisfiedLinkError: /opt//jdk1.4/jre/lib/i386/libjaybird.so:
> /opt/jdk1.4/jre/lib/i386/libjaybird.so: undefined symbol:
> _ZTVN10__cxxabiv117__class_type_infoE
> at java.lang.ClassLoader$NativeLibrary.load(Native Method)
> at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1473)
> at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1389)
> at java.lang.Runtime.loadLibrary0(Runtime.java:788)
> at java.lang.System.loadLibrary(System.java:832)
> at org.firebirdsql.ngds.GDS_Impl.<init>(GDS_Impl.java:53)
>
>
> When i ldd-ed the libjaybird.so I saw this
> [root@localhost libr]# ldd -r /usr/lib/libjaybird.so
> libdl.so.2 => /lib/libdl.so.2 (0x40037000)
> libc.so.6 => /lib/i686/libc.so.6 (0x42000000)
> /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x80000000)
> undefined symbol: _ZTVN10__cxxabiv117__class_type_infoE
> (/usr/lib/libjaybird.so)
> undefined symbol: __gxx_personality_v0 (/usr/lib/libjaybird.so)
> undefined symbol: _ZTISt9bad_alloc (/usr/lib/libjaybird.so)
> undefined symbol: _Znaj (/usr/lib/libjaybird.so)
> undefined symbol: _ZdlPv (/usr/lib/libjaybird.so)
> undefined symbol: __cxa_end_catch (/usr/lib/libjaybird.so)
> undefined symbol: _Unwind_Resume (/usr/lib/libjaybird.so)
> undefined symbol: __cxa_throw (/usr/lib/libjaybird.so)
> undefined symbol: _ZdaPv (/usr/lib/libjaybird.so)
> undefined symbol: __cxa_begin_catch (/usr/lib/libjaybird.so)
> undefined symbol: __cxa_allocate_exception (/usr/lib/libjaybird.so)
>
> I searched for those symbols and I found them in libfbembedded.so
>
> At this point the final solution was simple (coping libfbembedded.so to
> libfbclient.so)
> LD_PRELOAD libfbcliend.so java -cp <my_classes> <main_method>
>
> Everything wokrs just fine on my apps and tests excpet BLOBLS ofcourse :)
> Actually i modified java.library.path (well this time using path.seprator
> instead of ";")
> The problem is that I played with LD_LIBRARY_PATH and java.library.path

but

> it was 5am in the morning, so I am not 100% sure which solutuon works,
> however I am 95% sure that java.library.path is the right one.
>
> So I have several questions now:
> LD_PRELOAD is not suitable for running embedded firebird with java course
> IDE's refuse to start. I know I can use type4 drivers for development, but

I

> really like to develop in enviroment much closer to real situation.
>
> Since libjaybird is wrapper to libfbembedded why not link to it?
>
> Yesterday I had a nasty problem with fbembedded on Windows. MSVC60 Depends
> tool shows that fbembedded (fbclient) depends only on msvcrt.dll but when

I

> deployed the app on tests machines which does not have any additional
> software installed I saw that msvcp60.dll is required also (which was a
> difficult to trace problem, my first instalation was on win9x machine,

which

> threw an exception, win2k machine pop-uped a screen which informed me

about

> missed dll but 2 hours later... :(
> I added /D_STATIC_CPPLIB as a compiler directive but didn't helped. How

can

> work out this situatuon?
>
> Can some one fix the bug in entrypoints.cpp so I can test against BLOB's?
> Can some one guide me a little with JUnit tetst for firebird so I can

rework

> them to run against embedded firebird. I suppose linking to fbclient will

be

> required. (well I bought used copy of Java tools for extreme programming,

so

> in a week or so I will learn log4j, ant and JUnit).
> What else can I do to help?
>
> Regards,
> Nikolay Ivanchev
>
>
>
>
>
>
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