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In article <3ae86f05_1@dnews>, Massimiliano Trezzi wrote:
> Linux RedHat 7.1
> Interbase 6.01 Open Source

> Hi,

> I'm porting some udf functions from Windows to Linux. Now I'm only trying
> with a couple of them and I have a problem.

> Trying to use the udf (INUDF_Abs) I get:

> <

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"Massimiliano Trezzi" <masst...@tin.it> wrote in message

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> Linux RedHat 7.1
> Interbase 6.01 Open Source

> Hi,

> I'm porting some udf functions from Windows to Linux. Now I'm only trying
> with a couple of them and I have a problem.

> Trying to use the udf (INUDF_Abs) I get:

> <
> Invalid request BLR at offset 59
> function INUDF_ABS is not defined
> module name or entrypoint could not be found
> Statement: select inudf_abs(-1) from rdb$database

> The library is written in C++ and I build it with a makefile like this:

> <
> INGlobals: INGlobals.o NumUdf.o Stringudf.o
>     ld -o INGlobals INGlobals.o NumUdf.o Stringudf.o -shared -lgds
> INGlobals.o: INGlobals.cpp
>     g++ -c INGlobals.cpp
> NumUdf.o: NumUdf.cpp
>     g++ -c NumUdf.cpp
> Stringudf.o: StringUdf.cpp
>     g++ -c StringUdf.cpp

> I moved the library I made (INGlobals) to /interbase_path/udf dir and I
> updated the LD_LIBRARY_PATH too!

> I can't understand if Interbase can't find the library or the function.
> Maybe there's a name mismatch caused by the C++ name mangling, so I tried
> with extern "c", but the compiler does not like the "c", and finally I
kept
> the extern (but without it it's the same).

> It's my first linux library so maybe there's something as big as I'm new
to
> this enviroment!

> Who can help me?

> Thank You in advance
> Massimiliano Trezzi

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> Hi Massimo!
> I think that you have to add the parameter "-fpic" to the compiler
command.
> Something like this:
> g++ -c -fpic INGlobals.cpp

> By another side, in Unix/Linux remember the module name is case sensitive,
> if you are creating a shared lib with the name "INGlobals", then in the
> sentence DECLARE EXTERNAL FUNCTION, put the module
> name as MODULE_NAME 'INGlobals'

> See you!

> @riel.

> _________________________
> Ariel Carn
> Buenos Aires - ARGENTINA
> e-mail: aca...@ciudad.com.ar

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> Thank you Ariel,
> I tried but It doesn't work.
> The problem is in C++ name mangling: if I compile it as a C source, all
it's
> ok!
> If I compile it as a C++ source the problem arise befause of his export
> name.
> I can see it with the "nm" utility: when I call it for the C library i
get:
> <
> nm  INGlobals | grep INUDF
> 000002b0 T INUDF_Abs

> for the C++ library
> <
> nm INGlobals | grep INUDF
> 000025a0 T INUDF_Abs__fpd

> Now it's clear that the problem is the name of the exported function.
> In Windows with Borland C++ I used extern "c"  but in Linux?

> Thank you in advance,
> Massimiliano Trezzi