Re: Hello world program loads unused Oracle SO libraries

herbert koelman <herbert.koelman@xxxxxxxx> writes:

kermit wrote:
On Wed, 01 Nov 2006 13:40:43 +0100, herbert koelman wrote:

I've written the classic hello.c (the one that says hello world).

I used a makefile that builds programs to run against Oracle using
OCCI. So make runs this command:
cc -I
/usr/lib/oracle/xe/app/oracle/product/10.2.0/client/rdbms/public/
-g -D_REENTRANT -I
/usr/lib/oracle/xe/app/oracle/product/10.2.0/client/rdbms/public/
-g
-D_REENTRANT -L
/usr/lib/oracle/xe/app/oracle/product/10.2.0/client/lib -L
/usr/lib/oracle/xe/app/oracle/product/10.2.0/server/lib -locci
-lclntsh -lpthread hello.c -o hello

This produced the hello program.

So far still good. Now I run the program and obtains:
[herbert@pc-bureau src]$ ./hello herbert
./hello: error while loading shared libraries: libocci.so.10.1:
cannot open shared object file: No such file or directory

I don't understand why would the program try to load a library it
is not using !!??
... because you linked agained libocci ( -locci in your compile
flags).
Obviously for just a hello world program, you wouldn't need to link
against these

Hello there,

Do you mean that I have to set different library flags according to
what I'm about to build ?

Maybe.

Then I would need a Makefile to build hello world programs and another
one for Oracle programs ? Or is there away to handle both cases in one
makefile.

pgm1: pgm1.o ....
cc -locci -o $@
pgm2: pgm2.o ....
cc -o $@
.

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